Dr Sai Anand Gopalan

Dr Sai Anand Gopalan

Research Associate

Office - DVC (Research and Innovation)

Career Summary

Biography

Dr. Sai-Anand Gopalan is a Research Associate in Prof. Ajayan Vinu's group at Global Innovative Center for Advanced Nanomaterials, Faculty of Engineering and Natural Built Environment, University of Newcastle, Callaghan, New South Wales. Prior, to this position, he has worked as a Research Associate in Future Industries Institute, University of South Australia, Adelaide for a period of one year (Oct 2016 - Sept 2017). He hails from Chennai, India, where he completed his Bachelor’s Degree (2007) from Panimalar Engineering College affiliated to Anna University. He obtained his Master’s Degree from School of Electrical and Computer Science Engineering, Kyungpook National University (KNU) in the year 2011 and subsequently worked with LG Electronics, Innovative Experience Group, TV Division (Seocho, Seoul) as a Research Engineer for about a year (2011 – 2012). He was awarded Ph.D., from the School of Electronics Engineering, KNU, Daegu, Korea. His doctoral thesis work mainly deals with the design, synthesis, material characterization of new sulfonated polyaniline (SPANs) based buffer/interfacial layer and strategies involving SPANs, device fabrication and performance evaluation in polymer photovoltaic cells.  

He has contributed more than 30 research articles, covering topics across polymeric photovoltaics, biosensors, electrocatalysts, photocatalysts, quantum dots light emitting diodes etc. His recent research focus is on the design and development of novel nanoporous functional materials exploring its widespread potential in clean energy technologies such as fuel cells, supercapacitors, fuel cells to address global energy demands and environmental challenges.

Google Scholar : https://scholar.google.com/citations?user=WhsHWagAAAAJ&hl=en


Qualifications

  • PhD, Kyungpook National University
  • Bachelor of Engineering, Anna University
  • Master of Engineering, Kyungpook National University

Keywords

  • Electrocatalysis
  • Electrochemistry
  • Energy materials
  • Functional nanomaterials
  • Materials science
  • Solar energy conversion

Languages

  • English (Working)
  • Korean (Working)
  • Tamil (Mother)

Fields of Research

Code Description Percentage
030304 Physical Chemistry of Materials 25
030302 Nanochemistry and Supramolecular Chemistry 25
030301 Chemical Characterisation of Materials 50

Professional Experience

UON Appointment

Title Organisation / Department
Research Associate University of Newcastle
Office - DVC (Research and Innovation)
Australia

Academic appointment

Dates Title Organisation / Department
4/10/2016 - 29/09/2017 Research Associate The University of South Australia
Australia
10/09/2012 - 28/09/2016 Graduate Research Fellow Kyungpook National University
Korea, Republic of

Professional appointment

Dates Title Organisation / Department
7/02/2011 - 6/02/2012 Research Engineer LG Electronics, Inc
Innovating Experience Group, TV Division
Korea, Republic of
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Publications

For publications that are currently unpublished or in-press, details are shown in italics.

Highlighted Publications

Year Citation Altmetrics Link
2013 Komathi S, Gopalan AI, Kim S-K, Anand GS, Lee K-P, 'Fabrication of horseradish peroxidase immobilized poly(N-[3-(trimethoxy silyl)propyl]aniline) gold nanorods film modified electrode and electrochemical hydrogen peroxide sensing', Electrochimica Acta, 92 71-78 (2013)
DOI 10.1016/j.electacta.2013.01.032
2013 Anand GS, Gopalan AI, Kang S-W, Lee K-P, 'Development of a surface plasmon assisted label-free calorimetric method for sensitive detection of mercury based on functionalized gold nanorods', Journal of Analytical Atomic Spectrometry, 28 488-488 (2013)
DOI 10.1039/c3ja30300d
2013 Sai-Anand G, Gopalan AI, Kang SW, Lee KP, 'Fabrication of gold nanoflower anchored conducting polymer hybrid film electrode by pulse potentiostatic deposition', IEEE Electron Device Letters, 34 1065-1067 (2013)

In this letter, we report a simple and rapid (~ 60 s) method to fabricate a new organic-inorganic hybrid film based on poly (di phenyl amine-co-4 amino thiophenol) (designated as ... [more]

In this letter, we report a simple and rapid (~ 60 s) method to fabricate a new organic-inorganic hybrid film based on poly (di phenyl amine-co-4 amino thiophenol) (designated as PDPAAT) and gold nanoflowers (Au NFs). The fabrication involves a fast facile and pulse potentiostatic approach for the electrodeposition of Au NFs onto PDPAAT. The electrochemical, interfacial, and optical properties of the PDPAAT/Au NF hybrid film electrode are investigated. The superior electroactivity, electrochemical, and interfacial characteristics of the PDPAAT/Au NF electrode suggests its suitability for sensor, electrocatalysis, and diode applications. © 1980-2012 IEEE.

DOI 10.1109/LED.2013.2266669
Citations Scopus - 7
2013 Gopalan AI, Komathi S, Sai Anand G, Lee KP, 'Nanodiamond based sponges with entrapped enzyme: A novel electrochemical probe for hydrogen peroxide', Biosensors and Bioelectronics, 46 136-141 (2013)

A "modular approach" has been demonstrated for the preparation of nanodiamond (ND) based sponges (NS) with entrapped enzyme (horseradish peroxidase, HRP) (ND-NS(HRP)) an... [more]

A "modular approach" has been demonstrated for the preparation of nanodiamond (ND) based sponges (NS) with entrapped enzyme (horseradish peroxidase, HRP) (ND-NS(HRP)) and utilization as an electrochemical probe for detection of hydrogen peroxide (H 2 O 2 ). ND-NS comprises ND, porous poly(aniline)-poly(2-acrylamido 2-methyl propane sulfonic acid) (PANI-PAMPSA) network and entrapped HRP. Field emission scanning electron microscope image of ND-NS(HRP) reveals sponge like suprastructure comprising interconnected nanospheres with numerous openings/pinholes/cavities. The entrapped HRP in ND-NS exhibits effective direct electron transfer with an electron transfer rate constant of 1.85s -1 . ND-NS(HRP) exhibited excellent bioelectrocatalytic reduction of hydrogen peroxide (H 2 O 2 ) with a wide linear concentration range (1-45mM), quick response (5s), high sensitivity (129.6µAM -1 ) and low detection limit 59µM (S/N=3). © 2013 Elsevier B.V.

DOI 10.1016/j.bios.2013.02.036
Citations Scopus - 31
2014 Han B, Gopalan SA, Lee KD, Kang BH, Lee SW, Lee JS, et al., 'Preheated solvent exposure on P3HT:PCBM thin film: A facile strategy to enhance performance in bulk heterojunction photovoltaic cells', Current Applied Physics, 14 1443-1450 (2014)

© 2014 Published by Elsevier B.V. In this study, we explored the ability of a preheated solvent (methanol) to induce characteristic changes at the organic active layer/metal inte... [more]

© 2014 Published by Elsevier B.V. In this study, we explored the ability of a preheated solvent (methanol) to induce characteristic changes at the organic active layer/metal interface, thereby improving the performance of fabricated organic photovoltaic (OPV) cells composed of poly(3-hexylthiopene) (P3HT) and a [6,6]-phenyl-C 71 -butyric acid methyl ester (PCBM) photoactive blend. Our results demonstrate that exposure to methanol (at room temperature, or preheated at 45 °C or 65 °C) improves the performance of the fabricated OPV cells. After preheated methanol exposure, the P3HT:PCBM thin films were tested for crystallinity, morphology, mobility, and photovoltaic characteristics. Our results revealed that use of the preheated solvent on the organic active layer significantly influences the micro/nano scale morphology and phase segregation of the P3HT:PCBM thin films, as well as the charge carrier mobility. It is hypothesized that the side chain ordering of P3HT and redistribution of PCBM could be results of the modified active layer. Consequently, OPV cells modified with the methanol preheated at 65 °C exhibited a power conversion efficiency (PCE) of 3.36%, with open-circuit voltage of 0.59 V, short-circuit current density of 13.83 mA/cm 2 , and fill-factor of 0.41. In contrast, the unmodified P3HT:PCBM thin film (without methanol exposure) showed a PCE of only 2.13%.

DOI 10.1016/j.cap.2014.08.010
Citations Scopus - 14
2014 Gopalan SA, Seo MH, Anantha-Iyengar G, Han B, Lee SW, Kwon DH, et al., 'Mild wetting poor solvent induced hydrogen bonding interactions for improved performance in bulk heterojunction solar cells', Journal of Materials Chemistry A, 2 2174-2186 (2014)

In this paper, we demonstrate a facile, mild wetting (short residence time) poor solvent [isopropyl alcohol (IPA)] treatment, carried out on the top surface of a spin-cast poly (3... [more]

In this paper, we demonstrate a facile, mild wetting (short residence time) poor solvent [isopropyl alcohol (IPA)] treatment, carried out on the top surface of a spin-cast poly (3-hexylthiopene) (P3HT) and [6,6] -phenyl-C71- butyric acid methyl ester (PCBM) blend film, in order to fabricate high-performance polymer solar cells (PSCs). This method utilizes the hydrophilic and polar/hydrogen bonding interactions of IPA with the blend components (P3HT and PCBM). The photovoltaic (PV) performance of the fabricated PSCs was optimized by utilizing a preheated IPA wetting treatment and devices fabricated with the configuration: ITO/PEDOT:PSS/P3HT:PCBM/M-IPA-T°/Al (T°: 25°C/45°C/65°C/85°C) (where "M" stands for modified IPA and "T" signifies the temperature used for the IPA wetting). Our investigation encompasses electrical, optical, crystalline, and morphological studies on the P3HT:PCBM blend films,modified by preheated IPA, to elucidate the associated enhancements in the PV characteristics and performance. The device fabricated with IPA-85°C (ITO/PEDOT:PSS/P3HT:PCBM/M- IPA-85°C/Al) exhibited the best power conversion efficiency (PCE) of 3.51%, with an open circuit voltage of 0.65 V, a fill factor of 0.52, and a short-circuit current density of 10.20 mA cm -2 . In contrast, the non-modified blend film device showed a PCE of only ~3.04%. Ultraviolet-visible absorption studies and X-ray diffraction results suggest that the use of the pre-heated mild-wetting IPA treatment improves the crystallinity and self-organization of the blend layer. We rationalize our findings based on the interactions between IPA and the blend components, due to its high polar and hydrogen bonding Hansen solubility parameters to impart supramolecular assembly of P3HT chains during the blend film formation. This is the first report demonstrating that the poor solvent (IPA) can induce an optimal phase separation in a P3HT:PCBM blend through our proposed mild wetting preheated treatment, toward achieving high-performance PSCs. © 2014 The Royal Society of Chemistry.

DOI 10.1039/c3ta13875e
Citations Scopus - 16
2015 Lee HG, Sai-Anand G, Komathi S, Gopalan AI, Kang SW, Lee KP, 'Efficient visible-light-driven photocatalytic degradation of nitrophenol by using graphene-encapsulated TiO

© 2014 Elsevier B.V. In this work, a new hybrid nanocatalyst, namely titanium dioxide (TiO 2 ) composite nanowires, encapsulated with graphene (G) and palladium nanoparticles (Pd... [more]

© 2014 Elsevier B.V. In this work, a new hybrid nanocatalyst, namely titanium dioxide (TiO 2 ) composite nanowires, encapsulated with graphene (G) and palladium nanoparticles (Pd NPs) (designated as G-Pd@TiO 2 -CNWs), was prepared. In preparing the nanowires, a combination of electrospinning and hydrothermal approaches was employed. The visible-light-driven photocatalytic performance of G-Pd@TiO 2 -CNWs was investigated using the reduction of 4-nitrophenol (4-NP) as a model reaction. The results showed that G-Pd@TiO 2 -CNWs converted nearly 100% of 4-NP under visible light irradiation. The reaction kinetics of the photocatalytic reduction of 4-NP was studied by UV-vis spectrophotometry and the apparent rate constant was determined and compared with those for other supported TiO 2 catalysts. Furthermore, the spent G-Pd@TiO 2 -CNWs could be recovered by simple centrifugation and reused. The work is expected to shed new light on the development of G-incorporated hybrid nanostructures for harvesting light energy and on the development of new photocatalysts for the removal of environmental pollutants.

DOI 10.1016/j.jhazmat.2014.09.014
Citations Scopus - 32
2015 Sai-Anand G, Gopalan AI, Lee KP, Venkatesan S, Kang BH, Lee SW, et al., 'A futuristic strategy to influence the solar cell performance using fixed and mobile dopants incorporated sulfonated polyaniline based buffer layer', Solar Energy Materials and Solar Cells, 141 275-290 (2015)

© 2015 Elsevier B.V. In this work, we hypothesized and demonstrated a new strategy to tune/modulate the electrochemical, microstructural and opto-electronic properties based on t... [more]

© 2015 Elsevier B.V. In this work, we hypothesized and demonstrated a new strategy to tune/modulate the electrochemical, microstructural and opto-electronic properties based on the manipulation of the intentionally included external dopant ion (X < sup > - < /sup > ) within the sulfonated polyaniline (SPANs). Through our new strategy, we developed a different type of SPANs comprising of internal (fixed) and external (mobile) dopant. The X < sup > - < /sup > included SPANs were prepared through a sequential doping, dedoping and redoping processes and designated as SPAN-R (X < sup > - < /sup > ) (where X < sup > - < /sup > is the anion of toluene sulfonic acid (TSA) or camphor sulfonic acid (CSA) or napthalene sulfonic acid (NSA)) by modifying the structure of 4-aminodiphenylamine-2-sulfonic acid with additional polyaniline chains to accommodate X < sup > - < /sup > . SPAN-R(X < sup > - < /sup > ) polymers were characterized by cyclic voltammetry, UV-visible spectroscopy, attenuated total reflectance-Fourier transform infrared spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy and Atomic force microscopy to elucidate the influence of X < sup > - < /sup > on the electrical, optoelectronic, microstructural properties and surface properties on the performance characteristics of polymer solar cells (PSCs) fabricated with SPAN-R(X < sup > - < /sup > ) as a buffer layer. The electrochemical band gap, degree of doping (DD), electrical conductivity and degree of crystallinity (CD) were evaluated and correlated to understand the influence of X < sup > - < /sup > on them. The power conversion efficiency (PCE) of PSCs featuring SPAN-R(TSA < sup > - < /sup > ) as a buffer layer showed a ~3.2 times improvement in the overall PCE, compared with the PSCs having pristine SPAN (not containing X < sup > - < /sup > ) as a buffer layer and is higher than that of SPAN-R(CSA < sup > - < /sup > ) and SPAN-R(NSA < sup > - < /sup > ) based devices. The superior photovoltaic (PV) characteristics observed for SPAN-R(TSA < sup > - < /sup > ) is due to the synergistic contributions from appropriate energy-level/work function alignment, higher conductivity, higher DD and induced molecular order with the photoactive layer. Importantly, PSCs with SPAN-R(X < sup > - < /sup > ) buffer layer processed at low temperature (30 °C) (without thermal treatment) exhibited improved PV characteristics and better air-stability as compared to the device having poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) (thermally annealed at 150 °C) as buffer layer. As buffer layers, SPAN-R(X < sup > - < /sup > ) polymers, containing fixed and mobile dopants, are most attractive because of low temperature processability and improved solar cell performance.

DOI 10.1016/j.solmat.2015.05.035
Citations Scopus - 8
2016 Shanmugasundaram K, Sai-Anand G, Gopalan AI, Lee HG, Yeo HK, Kang SW, Lee KP, 'Direct electrochemistry of cytochrome c with three-dimensional nanoarchitectured multicomponent composite electrode and nitrite biosensing', Sensors and Actuators, B: Chemical, 228 737-747 (2016)

© 2016 Elsevier B.V. All rights reserved. A novel electrochemical nitrite ion (NO 2 - ) biosensor was designed and fabricated by modifying a glassy carbon electrode (GCE) into th... [more]

© 2016 Elsevier B.V. All rights reserved. A novel electrochemical nitrite ion (NO 2 - ) biosensor was designed and fabricated by modifying a glassy carbon electrode (GCE) into three-dimensional nanoarchitectured electrode (3DNE) using a multicomponent nanocomposite (MCNC) film composed of graphene embedded titanium dioxide nanowires (TiO 2 (G) NWs), thiol-functionalized polyaniline (PANI(SH)), gold nanoparticles (Au), and immobilized cytochrome c (cyt c). The new NO 2 - biosensor was designated as cyt c/TiO 2 (G) NWs@PANI(SH)-Au MCNC/3DNE. The assembly of the 3DNE, involved sequential depositions of PANI(SH) and Au over previously synthesized TiO 2 (G) NWs by electrospinning-hydrothermal processes and immobilization of the cyt c onto the TiO 2 (G) NWs/PANI(SH)/Au MCNC film. The cyt c/TiO 2 (G) NWs@PANI(SH)-Au MCNC/3DNE exhibited direct electron transfer from cyt c to the electrode at a high rate constant (25.34 s -1 ). The fabricated cyt c/TiO 2 (G) NWs@PANI(SH)-Au MCNC/3DNE showed high selectivity to NO 2 - ions with excellent sensitivity (9.2 µA/mM), a wide linear concentration range (10 µM-720 mM), and a low detection limit (0.05 µM). Additionally, the cyt c/TiO 2 (G) NWs@PANI(SH)-Au MCNC/3DNE exhibited high stability with good reproducibility and repeatability.

DOI 10.1016/j.snb.2016.01.109
Citations Scopus - 5
2017 Xu B, Gopalan SA, Gopalan AI, Muthuchamy N, Lee KP, Lee JS, et al., 'Functional solid additive modified PEDOT:PSS as an anode buffer layer for enhanced photovoltaic performance and stability in polymer solar cells', Scientific Reports, 7 (2017)

© 2017 The Author(s). Poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) is most commonly used as an anode buffer layer in bulk-heterojunction (BHJ) polymer sol... [more]

© 2017 The Author(s). Poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) is most commonly used as an anode buffer layer in bulk-heterojunction (BHJ) polymer solar cells (PSCs). However, its hygroscopic and acidic nature contributes to the insufficient electrical conductivity, air stability and restricted photovoltaic (PV) performance for the fabricated PSCs. In this study, a new multifunctional additive, 2,3-dihydroxypyridine (DOH), has been used in the PEDOT: PSS buffer layer to obtain modified properties for PEDOT: PSS@DOH and achieve high PV performances. The electrical conductivity of PEDOT:PSS@DOH films was markedly improved compared with that of PEDOT:PSS. The PEDOT:PSS@DOH film exhibited excellent optical characteristics, appropriate work function alignment, and good surface properties in BHJ-PSCs. When a poly(3-hexylthiohpene):[6,6]-phenyl C 61-butyric acid methyl ester blend system was applied as the photoactive layer, the power conversion efficiency of the resulting PSCs with PEDOT:PSS@DOH(1.0%) reached 3.49%, outperforming pristine PEDOT:PSS, exhibiting a power conversion enhancement of 20%. The device fabricated using PEDOT:PSS@DOH (1.0 wt%) also exhibited improved thermal and air stability. Our results also confirm that DOH, a basic pyridine derivative, facilitates adequate hydrogen bonding interactions with the sulfonic acid groups of PSS, induces the conformational transformation of PEDOT chains and contributes to the phase separation between PEDOT and PSS chains.

DOI 10.1038/srep45079
Citations Scopus - 1

Journal article (33 outputs)

Year Citation Altmetrics Link
2017 Jiang Y, Sai-Anand G, Xu B, Lee JS, Kim SW, Yeom SH, et al., 'Enhancing the photovoltaic performance of polymer solar cells by manipulating photoactive/metal interface', Journal of Nanoscience and Nanotechnology, 17 8024-8030 (2017)

Copyright © 2017 American Scientific Publishers All rights reserved In this work, a hybrid system composed of inorganic zinc oxide nanocrystals (ZnO NCs) and the organic conjugat... [more]

Copyright © 2017 American Scientific Publishers All rights reserved In this work, a hybrid system composed of inorganic zinc oxide nanocrystals (ZnO NCs) and the organic conjugated polymer (poly[(9,9-bis(3-(N,N-dimethylamino)propyl)-2,7-fluorene)-alt-2,7-(9,9-dioctylfluorene)]) (PFN) was utilized as an electron selecti ve interlayer (ESIL) to improve the electro-optical characteristics of bulk-heterojunction (BHJ) polymer solar cells (PSCs). To accomplish, water/alcohol-soluble cationic polyelectrolyte, PFN, was introduced into ZnO NCs (ZnO-PFN), aiming to enhance the electron extraction capability between the photoactive layer and the metal (Al) electrode in standard geometry BHJ PSCs. Importantly, the ZnO-PFN blend system achieved a higher power conversion efficiency (PCE) than pristine (ZnO NCs) ESILs. Moreover, an optimized photovoltaic (PV) performance was obtained with a low volume of PFN incorporated into the ZnO NCs ESIL. To validate the PV performance, PSCs were fabricated based on co-polymer of thienyl substituted BDT with TT:phenyl-C71-butyric acid methyl ester (PBDTTT-C-T:PC 71 BM) and poly(3hexylthiophene-2,5-diyl):phenyl-C61-butyric acid methyl ester (P3HT:PC 61 BM) photoactive systems and observed superior PV characteristics for ZnO-PFN hybrid ESILs. The optical transparency, microstructure, and morphological characteristics were evaluated using appropriate characterization techniques to demonstrate the superiority of the hybrid ZnO-PFN blend system. PSCs based on this ZnO-PFN composite based ESIL suggested an alternative practical approach to enhance the efficiency of the fabricated devices.

DOI 10.1166/jnn.2017.15110
Citations Scopus - 1
2017 Lee JS, Kang BH, Kim SH, Lee JW, Lee SW, Kim SW, et al., 'All-solution-processed high-brightness hybrid white quantum-dot light-emitting devices utilizing polymer modified quantum dots', Organic Electronics: physics, materials, applications, 42 393-398 (2017)

© 2016 Elsevier B.V. White quantum dot light-emitting devices (WQLEDs) are promising candidates for high-brightness, high-efficiency, and color-saturated displays. However, it is... [more]

© 2016 Elsevier B.V. White quantum dot light-emitting devices (WQLEDs) are promising candidates for high-brightness, high-efficiency, and color-saturated displays. However, it is still challenging to integrate various quantum dot (QD) emitters into one device and overcome their low blue luminous efficiencies. In this paper, we report the design and fabrication of all-solution-processed WQLEDs using a trichromatic hybrid with red, green, and blue (RGB)-emitting colloidal QDs and a blue-emitting homopolymer (poly[9,9-dioctylfluorenyl-2,7-diyl]-end capped with N,N-Bis(4-methylphenyl)-aniline, ADS329BE) in the device emission region. The white emission results from the integration of the RGB emission from the QDs and the blue emission generated by ADS329BE. The obtained results indicate that the hybrid WQLEDs exhibit pure white emission with an optimized concentration and charge balance in the emission layer (EML) and the occurrence of fluorescent resonance energy transfer between ADS329BE and the RGB QDs. The proposed devices show excellent performance with a maximum luminance of 15,950¿cd/m 2 , a current efficiency at maximum luminance of 1.43¿cd/A, and a low turn-on voltage of =2.0¿V, with Commission Internationale de l'Enclairage coordinates of (0.33, 0.34). These results indicate that the proposed method is an alternative and effective approach to achieve high performance in WQLEDs as well as other optoelectronic devices.

DOI 10.1016/j.orgel.2016.12.013
Citations Scopus - 2
2017 Xu B, Gopalan SA, Gopalan AI, Muthuchamy N, Lee KP, Lee JS, et al., 'Functional solid additive modified PEDOT:PSS as an anode buffer layer for enhanced photovoltaic performance and stability in polymer solar cells', Scientific Reports, 7 (2017)

© 2017 The Author(s). Poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) is most commonly used as an anode buffer layer in bulk-heterojunction (BHJ) polymer sol... [more]

© 2017 The Author(s). Poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) is most commonly used as an anode buffer layer in bulk-heterojunction (BHJ) polymer solar cells (PSCs). However, its hygroscopic and acidic nature contributes to the insufficient electrical conductivity, air stability and restricted photovoltaic (PV) performance for the fabricated PSCs. In this study, a new multifunctional additive, 2,3-dihydroxypyridine (DOH), has been used in the PEDOT: PSS buffer layer to obtain modified properties for PEDOT: PSS@DOH and achieve high PV performances. The electrical conductivity of PEDOT:PSS@DOH films was markedly improved compared with that of PEDOT:PSS. The PEDOT:PSS@DOH film exhibited excellent optical characteristics, appropriate work function alignment, and good surface properties in BHJ-PSCs. When a poly(3-hexylthiohpene):[6,6]-phenyl C 61-butyric acid methyl ester blend system was applied as the photoactive layer, the power conversion efficiency of the resulting PSCs with PEDOT:PSS@DOH(1.0%) reached 3.49%, outperforming pristine PEDOT:PSS, exhibiting a power conversion enhancement of 20%. The device fabricated using PEDOT:PSS@DOH (1.0 wt%) also exhibited improved thermal and air stability. Our results also confirm that DOH, a basic pyridine derivative, facilitates adequate hydrogen bonding interactions with the sulfonic acid groups of PSS, induces the conformational transformation of PEDOT chains and contributes to the phase separation between PEDOT and PSS chains.

DOI 10.1038/srep45079
Citations Scopus - 1
2016 Shanmugasundaram K, Sai-Anand G, Gopalan AI, Lee HG, Yeo HK, Kang SW, Lee KP, 'Direct electrochemistry of cytochrome c with three-dimensional nanoarchitectured multicomponent composite electrode and nitrite biosensing', Sensors and Actuators, B: Chemical, 228 737-747 (2016)

© 2016 Elsevier B.V. All rights reserved. A novel electrochemical nitrite ion (NO 2 - ) biosensor was designed and fabricated by modifying a glassy carbon electrode (GCE) into th... [more]

© 2016 Elsevier B.V. All rights reserved. A novel electrochemical nitrite ion (NO 2 - ) biosensor was designed and fabricated by modifying a glassy carbon electrode (GCE) into three-dimensional nanoarchitectured electrode (3DNE) using a multicomponent nanocomposite (MCNC) film composed of graphene embedded titanium dioxide nanowires (TiO 2 (G) NWs), thiol-functionalized polyaniline (PANI(SH)), gold nanoparticles (Au), and immobilized cytochrome c (cyt c). The new NO 2 - biosensor was designated as cyt c/TiO 2 (G) NWs@PANI(SH)-Au MCNC/3DNE. The assembly of the 3DNE, involved sequential depositions of PANI(SH) and Au over previously synthesized TiO 2 (G) NWs by electrospinning-hydrothermal processes and immobilization of the cyt c onto the TiO 2 (G) NWs/PANI(SH)/Au MCNC film. The cyt c/TiO 2 (G) NWs@PANI(SH)-Au MCNC/3DNE exhibited direct electron transfer from cyt c to the electrode at a high rate constant (25.34 s -1 ). The fabricated cyt c/TiO 2 (G) NWs@PANI(SH)-Au MCNC/3DNE showed high selectivity to NO 2 - ions with excellent sensitivity (9.2 µA/mM), a wide linear concentration range (10 µM-720 mM), and a low detection limit (0.05 µM). Additionally, the cyt c/TiO 2 (G) NWs@PANI(SH)-Au MCNC/3DNE exhibited high stability with good reproducibility and repeatability.

DOI 10.1016/j.snb.2016.01.109
Citations Scopus - 5
2016 Sai-Anand G, Gopalan AI, Lee KP, Venkatesan S, Qiao Q, Kang BH, et al., 'Electrostatic nanoassembly of contact interfacial layer for enhanced photovoltaic performance in polymer solar cells', Solar Energy Materials and Solar Cells, 153 148-163 (2016)

© 2016 Elsevier B.V. All rights reserved. Improved performance in the bulk heterojunction (BHJ) polymer solar cells (PSCs) can be achieved through multiple mechanisms by tuning t... [more]

© 2016 Elsevier B.V. All rights reserved. Improved performance in the bulk heterojunction (BHJ) polymer solar cells (PSCs) can be achieved through multiple mechanisms by tuning the structure of the components and design architecture. Therefore, in this study, we designed and fabricated an electrostatically assembled contact interfacial layer utilizing the electrostatic interactions between positively charged poly(diallyldimethylammonium chloride) (PDDA) and negatively charged sulfonate ions in a polymer, i.e. toluene sulfonic acid incorporated self-doped polyaniline (SPAN(TSA - )) (designated as SPAN(TSA - )/EA - CIL). We investigated the influence of SPAN(TSA - )/EA - CIL on the photovoltaic performance of BHJ PSCs. We adopted a simple "dip-dry" technique to fabricate the SPAN(TSA - )/EA - CIL. Cyclic Voltammetry, X-ray photoelectron spectroscopy, Ultraviolet-visible spectroscopy, water contact angle measurements, electrochemical impedance spectroscopy and atomic force microscopy were employed to characterize the new SPAN(TSA - )/EA - CIL and to elucidate the associated enhancements in the photovoltaic performance. The fabricated PSCs with the SPAN(TSA - )/EA-CILs exhibited an improved photoconversion efficiency (PCE) through enhancement of both the short-circuit current density (J SC ) and fill factor compared to the device consisting of only SPAN(TSA - ) or PEDOT:PSS. A plausible mechanism is presented here that explains the enhanced J SC and PCE in terms of transient dipole induction at the SPAN(TSA - )/EA-CIL surface. Interestingly, the PCE of devices based on ITO/SPAN(TSA - )/EA-CIL(1:1)/P3HT:PC 60 BM/Al and ITO/SPAN(TSA - )/EA-CIL(1:1)/PBDTTT-C-T:PC 70 BM/Al was enhanced by 13% (3.19-3.67%) and 10% (5.11-5.60%) compared to those of devices based on ITO/PEDOT:PSS/P3HT:PC 60 BM/Al and ITO/PEDOT:PSS/PBDTTT-C-T:PC 70 BM/Al, respectively. The present work thus identifies a novel class of low-temperature processable interface layer with a potential to fabricate highly efficient photovoltaic devices.

DOI 10.1016/j.solmat.2016.04.018
Citations Scopus - 6
2016 Haldorai Y, Hwang SK, Gopalan AI, Huh YS, Han YK, Voit W, et al., 'Direct electrochemistry of cytochrome c immobilized on titanium nitride/multi-walled carbon nanotube composite for amperometric nitrite biosensor', Biosensors and Bioelectronics, 79 543-552 (2016)

© 2015 Elsevier B.V. In this report, titanium nitride (TiN) nanoparticles decorated multi-walled carbon nanotube (MWCNTs) nanocomposite is fabricated via a two-step process. Thes... [more]

© 2015 Elsevier B.V. In this report, titanium nitride (TiN) nanoparticles decorated multi-walled carbon nanotube (MWCNTs) nanocomposite is fabricated via a two-step process. These two steps involve the decoration of titanium dioxide nanoparticles onto the MWCNTs surface and a subsequent thermal nitridation. Transmission electron microscopy shows that TiN nanoparticles with a mean diameter of =20nm are homogeneously dispersed onto the MWCNTs surface. Direct electrochemistry and electrocatalysis of cytochrome c immobilized on the MWCNTs-TiN composite modified on a glassy carbon electrode for nitrite sensing are investigated. Under optimum conditions, the current response is linear to its concentration from 1µM to 2000µM with a sensitivity of 121.5µAµM -1 cm -2 and a low detection limit of 0.0014µM. The proposed electrode shows good reproducibility and long-term stability. The applicability of the as-prepared biosensor is validated by the successful detection of nitrite in tap and sea water samples.

DOI 10.1016/j.bios.2015.12.054
Citations Scopus - 13
2016 Lee SW, Cha SH, Choi KJ, Kang BH, Lee JS, Kim SW, et al., 'Low dark-current, high current-gain of PVK/ZnO nanoparticles composite-based UV photodetector by PN-heterojunction control', Sensors (Switzerland), 16 (2016)

© 2016 by the authors; licensee MDPI, Basel, Switzerland. We propose a solution-processable ultraviolet (UV) photodetector with a pn-heterojunction hybrid photoactive layer (HPL)... [more]

© 2016 by the authors; licensee MDPI, Basel, Switzerland. We propose a solution-processable ultraviolet (UV) photodetector with a pn-heterojunction hybrid photoactive layer (HPL) that is composed of poly-n-vinylcarbazole (PVK) as a p-type polymer and ZnO nanoparticles (NPs) as an n-type metal oxide. To observe the effective photo-inducing ability of the UV photodetector, we analyzed the optical and electrical properties of HPL which is controlled by the doping concentration of n-type ZnO NPs in PVK matrix. Additionally, we confirmed that the optical properties of HPL dominantly depend on the ZnO NPs from the UV-vis absorption and the photoluminescence (PL) spectral measurements. This HPL can induce efficient charge transfer in the localized narrow pn-heterojunction domain and increases the photocurrent gain. It is essential that proper doping concentration of n-type ZnO NPs in polymer matrix is obtained to improve the performance of the UV photodetector. When the ZnO NPs are doped with the optimized concentration of 3.4 wt.%, the electrical properties of the photocurrent are significantly increased. The ratio of the photocurrent was approximately 10 3 higher than that of the dark current.

DOI 10.3390/s16010074
Citations Scopus - 3
2016 Lee SW, Choi KJ, Kang BH, Lee JS, Kim SW, Kwon JB, et al., 'Low dark current and improved detectivity of hybrid ultraviolet photodetector based on carbon-quantum-dots/zinc-oxide-nanorod composites', Organic Electronics: physics, materials, applications, 39 250-257 (2016)

© 2016 Elsevier B.V. In this study, we fabricated an ultraviolet (UV) photodetector by blending a hybrid photoactive layer (HPL) that is composed of a hybrid structure containing... [more]

© 2016 Elsevier B.V. In this study, we fabricated an ultraviolet (UV) photodetector by blending a hybrid photoactive layer (HPL) that is composed of a hybrid structure containing Carbon Quantum Dots (CQDs) and Zinc Oxide Nanorods (ZnO NRs). To observe the effective photo-inducing abilities of CQDs and ZnO NRs, we analyzed the electrical properties of a UV photodetector using an HPL of CQDs/ZnO NRs. Under an illumination of 365¿nm UV light with an intensity of 1¿mW/cm 2 , the UV photodetector exhibited a high detectivity of 8.33¿×¿10 12 Jones, which is higher than that of a UV photodetector using a HPL of blended poly-n-vinylcarbazole (PVK) and ZnO NRs. Experimental results show that an HPL of blended CQDs/ZnO NRs can induce efficient charge extraction from CQDs and ZnO NRs. In addition, CQDs act as charge controllers that enable hole-electron separation in the device upon UV illumination. These results indicate that synthesized CQDs can substitute for a charge transport polymer (i.e., PVK) and that a UV photodetector using CQDs can exhibit high detectivity.

DOI 10.1016/j.orgel.2016.10.003
Citations Scopus - 1
2016 Kang BH, Lee JS, Lee SW, Kim SW, Lee JW, Gopalan SA, et al., 'Efficient exciton generation in atomic passivated CdSe/ZnS quantum dots light-emitting devices', Scientific Reports, 6 (2016)

© The Author(s) 2016. We demonstrate the first-ever surface modification of green CdSe/ZnS quantum dots (QDs) using bromide anions (Br -) in cetyl trimethylammonium bromide (CTAB... [more]

© The Author(s) 2016. We demonstrate the first-ever surface modification of green CdSe/ZnS quantum dots (QDs) using bromide anions (Br -) in cetyl trimethylammonium bromide (CTAB). The Br - ions reduced the interparticle spacing between the QDs and induced an effective charge balance in QD light-emitting devices (QLEDs). The fabricated QLEDs exhibited efficient charge injection because of the reduced emission quenching effect and their enhanced thin film morphology. As a result, they exhibited a maximum luminance of 71,000 cd/m 2 and an external current efficiency of 6.4 cd/A, both significantly better than those of their counterparts with oleic acid surface ligands. In addition, the lifetime of the Br- treated QD based QLEDs is significantly improved due to ionic passivation at the QDs surface.

DOI 10.1038/srep34659
Citations Scopus - 4
2015 Lee HG, Gopalan AI, Sai-Anand G, Lee BC, Kang SW, Lee KP, 'Facile synthesis of functionalized graphene-palladium nanoparticle incorporated multicomponent TiO

© 2015 Elsevier B.V. All rights reserved. Herein, we report the synthesis of functionalized graphene-Pd nanoparticle incorporated titanium dioxide composite nanofibers (designate... [more]

© 2015 Elsevier B.V. All rights reserved. Herein, we report the synthesis of functionalized graphene-Pd nanoparticle incorporated titanium dioxide composite nanofibers (designated as TiO 2 @G(f)-Pd-CNFs) by combining electrospinning, hydrothermal and calcination processes. For comparison, functionalized graphene -incorporated titanium dioxide composite nanofibers (designated as TiO 2 @G(f) CNFs) were also prepared. The structural, morphological and optical properties of the TiO 2 -based composite nanofibers were characterized by field emission scanning electron microscopy, high resolution transmission electron microscopy, Raman spectroscopy, X-Ray photoelectron spectroscopy, X-Ray diffraction analysis and thermogravimetry. The morphologies of the composite nanofibers were systematically investigated by transmission electron microscope and scanning electron microscope. The components in the composite nanofibers were identified with different morphologies: a fibrillar structure of the TiO 2 nanofibers, irregular shaped graphene platelets and nanosized (sizes in the range of 4-12 nm) spherical Pd particles (around 8 nm). Thermogravimetry suggests that the inclusion of graphene and Pd improves the thermal stability of TiO 2 . The photocatalytic degradation of methylene blue (MB) was examined in the presence of the catalyst, TiO 2 @G(f)-Pd-CNFs under UV-irradiation and compared with TiO 2 NFs and TiO 2 @G(f) CNFs. The highest photodegradation efficiency was observed for TiO 2 @G(f)-Pd-CNFs and attributed to the synergistic influence of the components, TiO 2 NFs, Pd NPs and G(f).

DOI 10.1016/j.matchemphys.2015.01.055
Citations Scopus - 8
2015 Lee HG, Sai-Anand G, Komathi S, Gopalan AI, Kang SW, Lee KP, 'Efficient visible-light-driven photocatalytic degradation of nitrophenol by using graphene-encapsulated TiO

© 2014 Elsevier B.V. In this work, a new hybrid nanocatalyst, namely titanium dioxide (TiO 2 ) composite nanowires, encapsulated with graphene (G) and palladium nanoparticles (Pd... [more]

© 2014 Elsevier B.V. In this work, a new hybrid nanocatalyst, namely titanium dioxide (TiO 2 ) composite nanowires, encapsulated with graphene (G) and palladium nanoparticles (Pd NPs) (designated as G-Pd@TiO 2 -CNWs), was prepared. In preparing the nanowires, a combination of electrospinning and hydrothermal approaches was employed. The visible-light-driven photocatalytic performance of G-Pd@TiO 2 -CNWs was investigated using the reduction of 4-nitrophenol (4-NP) as a model reaction. The results showed that G-Pd@TiO 2 -CNWs converted nearly 100% of 4-NP under visible light irradiation. The reaction kinetics of the photocatalytic reduction of 4-NP was studied by UV-vis spectrophotometry and the apparent rate constant was determined and compared with those for other supported TiO 2 catalysts. Furthermore, the spent G-Pd@TiO 2 -CNWs could be recovered by simple centrifugation and reused. The work is expected to shed new light on the development of G-incorporated hybrid nanostructures for harvesting light energy and on the development of new photocatalysts for the removal of environmental pollutants.

DOI 10.1016/j.jhazmat.2014.09.014
Citations Scopus - 32
2015 Lee SW, Kim JS, Lee JS, Jeong HM, Gopalan SA, Kang SW, et al., 'Enhancement of CdSe/ZnS quantum dot-based LED by core-shell modification', Journal of the Korean Physical Society, 66 82-86 (2015)

© 2015, The Korean Physical Society. In this study, we performed an analysis of quantum-dot-based light-emitting diodes (QD-based LEDs) to investigate the defects at the interfac... [more]

© 2015, The Korean Physical Society. In this study, we performed an analysis of quantum-dot-based light-emitting diodes (QD-based LEDs) to investigate the defects at the interface between the core and the shell of the quantum dots (QDs) using gradient-shell QDs (CdSe/Cd 1-x Zn x Se 1-y S y /ZnS, G-QDs) and single-shell QDs (CdSe/ZnS, S-QDs). QDs of the general core-shell type have defects at the core and shell junction interface due to the different lattice constants. However, G-QDs have a low number of lattice defects in the form of a step function between the core and the shell owing to their chemical composition and can more easily confine electron-hole pairs (EHP). Therefore, we fabricated QD-based LEDs by using two emissive layer (G-QDs and S-QDs) and analyzed their characteristics, including their brightness and efficiency.

DOI 10.3938/jkps.66.82
Citations Scopus - 1
2015 Sai-Anand G, Gopalan AI, Lee KP, Venkatesan S, Kang BH, Lee SW, et al., 'A futuristic strategy to influence the solar cell performance using fixed and mobile dopants incorporated sulfonated polyaniline based buffer layer', Solar Energy Materials and Solar Cells, 141 275-290 (2015)

© 2015 Elsevier B.V. In this work, we hypothesized and demonstrated a new strategy to tune/modulate the electrochemical, microstructural and opto-electronic properties based on t... [more]

© 2015 Elsevier B.V. In this work, we hypothesized and demonstrated a new strategy to tune/modulate the electrochemical, microstructural and opto-electronic properties based on the manipulation of the intentionally included external dopant ion (X < sup > - < /sup > ) within the sulfonated polyaniline (SPANs). Through our new strategy, we developed a different type of SPANs comprising of internal (fixed) and external (mobile) dopant. The X < sup > - < /sup > included SPANs were prepared through a sequential doping, dedoping and redoping processes and designated as SPAN-R (X < sup > - < /sup > ) (where X < sup > - < /sup > is the anion of toluene sulfonic acid (TSA) or camphor sulfonic acid (CSA) or napthalene sulfonic acid (NSA)) by modifying the structure of 4-aminodiphenylamine-2-sulfonic acid with additional polyaniline chains to accommodate X < sup > - < /sup > . SPAN-R(X < sup > - < /sup > ) polymers were characterized by cyclic voltammetry, UV-visible spectroscopy, attenuated total reflectance-Fourier transform infrared spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy and Atomic force microscopy to elucidate the influence of X < sup > - < /sup > on the electrical, optoelectronic, microstructural properties and surface properties on the performance characteristics of polymer solar cells (PSCs) fabricated with SPAN-R(X < sup > - < /sup > ) as a buffer layer. The electrochemical band gap, degree of doping (DD), electrical conductivity and degree of crystallinity (CD) were evaluated and correlated to understand the influence of X < sup > - < /sup > on them. The power conversion efficiency (PCE) of PSCs featuring SPAN-R(TSA < sup > - < /sup > ) as a buffer layer showed a ~3.2 times improvement in the overall PCE, compared with the PSCs having pristine SPAN (not containing X < sup > - < /sup > ) as a buffer layer and is higher than that of SPAN-R(CSA < sup > - < /sup > ) and SPAN-R(NSA < sup > - < /sup > ) based devices. The superior photovoltaic (PV) characteristics observed for SPAN-R(TSA < sup > - < /sup > ) is due to the synergistic contributions from appropriate energy-level/work function alignment, higher conductivity, higher DD and induced molecular order with the photoactive layer. Importantly, PSCs with SPAN-R(X < sup > - < /sup > ) buffer layer processed at low temperature (30 °C) (without thermal treatment) exhibited improved PV characteristics and better air-stability as compared to the device having poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) (thermally annealed at 150 °C) as buffer layer. As buffer layers, SPAN-R(X < sup > - < /sup > ) polymers, containing fixed and mobile dopants, are most attractive because of low temperature processability and improved solar cell performance.

DOI 10.1016/j.solmat.2015.05.035
Citations Scopus - 8
2015 Lee JS, Yoon NR, Kang BH, Lee SW, Gopalan SA, Kim SW, et al., 'Au-polypyrrole framework nanostructures for improved localized surface plasmon resonance volatile organic compounds gas sensing', Journal of Nanoscience and Nanotechnology, 15 7738-7742 (2015)

Copyright © 2015 American Scientific Publishers All rights reserved. In this paper, we propose an Au-polypyrrole (Ppy) nanorod gas sensor for the detection of volatile organic co... [more]

Copyright © 2015 American Scientific Publishers All rights reserved. In this paper, we propose an Au-polypyrrole (Ppy) nanorod gas sensor for the detection of volatile organic compound (VOC) gases. This gas sensor operates on the principle of localized surface plasmon resonance (LSPR). The Au-Ppy nanorods used in this experiment were synthesized using an anodic aluminum oxide template by the electrochemical deposition method. Using field emission scanning electron microscopy, we confirmed that the Au-Ppy nanorod arrays were successfully fabricated with a uniform size. By depositing gold, the Au-Ppy nanorods exhibited both optical and LSPR interference. The gas sensing properties of the fabricated nanorods were tested for VOCs such as acetic acid, benzene, and toluene with a short response time (~1 min). Moreover, the proposed VOC gas sensing system was tested with three types of VOC gases over a wide concentration range from 10 to 100 ppm. Highest sensitivity was observed for acetic acid gas, which had a linear relation with the gas concentration, indicating that the system can be used as a gas sensor.

DOI 10.1166/jnn.2015.11194
Citations Scopus - 2
2015 Kang BH, Kim JS, Lee JS, Lee SW, Sai-Anand G, Jeong HM, et al., 'Solution processable CdSe/ZnS quantum dots light-emitting diodes using ZnO nanocrystal as electron transport layer', Journal of Nanoscience and Nanotechnology, 15 7416-7420 (2015)

Copyright © 2015 American Scientific Publishers All rights reserved. In this paper, we propose interface engineering between cadmium selenide/zinc sulfide (CdSe/ZnS) quantum dots... [more]

Copyright © 2015 American Scientific Publishers All rights reserved. In this paper, we propose interface engineering between cadmium selenide/zinc sulfide (CdSe/ZnS) quantum dots (QDs) as the emissive layer (EML) and ZnO nanocrystals (NCs) as the electron transport layer (ETL) for reducing the potential barrier in QDs based light-emitting diode (QLED). The n-type ZnO NCs were effective in confining charge to the QDs EML because of their wide band gap. The ZnO NCs were synthesized using a modified sol-gel process and were applied as the ETL in QLED. For comparison, a standard QLED with Tris(8-hydroxyquinolinato)aluminium as the ETL was also fabricated. The standard QLED was shown to have a luminance of 11,240 cd/m 2 and current efficiency of 2.3 cd/A. However, QLED with ZnO NCs showed a higher luminance of 28,760 cd/m 2 and current efficiency of 4.9 cd/A than the reference structure, and so has more efficient charge transport. Thus, QLED with ZnO NCs not only simplified the process, but also enhanced the luminance and current efficiency by factor of two.

DOI 10.1166/jnn.2015.10542
Citations Scopus - 2
2015 Sai-Anand G, Han B, Kang BH, Kim SW, Lee SW, Lee JS, et al., 'Incorporation of gold nanodots into poly(3,4-ethylenedioxythiophene): Poly(styrene sulfonate) for an efficient anode interfacial layer for improved plasmonic organic photovoltaics', Journal of Nanoscience and Nanotechnology, 15 7092-7098 (2015)

Copyright © 2015 American Scientific Publishers All rights reserved. In this paper, we demonstrate a simple strategy for the incorporation of gold nanodots (GNDs) into poly(3,4-e... [more]

Copyright © 2015 American Scientific Publishers All rights reserved. In this paper, we demonstrate a simple strategy for the incorporation of gold nanodots (GNDs) into poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) films, towards fabrication of an efficient anode interfacial layer in order to improve the performance of bulk heterojunction (BHJ) solar cells that use a blend of poly(3-hexyl thiophene) and [6,6]-phenyl-C 71 butyric acid methyl ester as the organic active layer. We synthesized citrate-stabilized GNDs, with sizes in the range of ~20-30 nm, by initially blending them into PEDOT:PSS by aqueous dispersion. The influence of GNDs in the PEDOT:PSS layer on the photovoltaic characteristics of BHJ solar cells was investigated. Our results show that the improved performance is due to the enhanced conductivity and increased interfacial contact area between the PEDOT:PSS and organic active layer, owing to the inclusion of GNDs into the PEDOT:PSS. The BHJ solar cell included with GNDs (0.02 wt%) into PEDOT:PSS exhibited a power conversion efficiency (PCE) of 2.92% with an open circuit voltage of 0.61 V, fill factor of 50%, and a short-circuit current density of 9.51 mA/cm 2 , whereas the pristine device exhibited a PCE of 2.52%.

DOI 10.1166/jnn.2015.10537
Citations Scopus - 1
2015 Kang BH, Lee SW, Lim SW, Kim JS, Sai-Anand G, Lee SH, et al., 'Enhanced performance of light-emitting diodes by surface ligand modification on quantum dots', Journal of Nanoscience and Nanotechnology, 15 7169-7172 (2015)

© 2015 American Scientific Publishers All rights reserved. The electrical characteristics of quantum dots (QDs) can vary depending on the surface modulation, which can change the... [more]

© 2015 American Scientific Publishers All rights reserved. The electrical characteristics of quantum dots (QDs) can vary depending on the surface modulation, which can change the luminance and efficiency of electroluminescent devices. Thus, understanding surface ligand is essential in improving the performance of QDs-based light-emitting diodes (LEDs). We analyzed the performance of QDs-based LEDs with respect to the QD surface volume. On the QD surfaces, the 1.1 nm-long tryoctylphosphine oxide (TOPO) ligand with three neck-type structure was replaced with a 1.7 nm-long oleic acid (OA) ligand with a one neck-type structure to evaluate the dependence of the LED properties on the ligand length. With all other conditions being identical, the luminance and efficiency of the QDs-based LEDs with an OA ligand were approximately 1,000 cd/m 2 greater and 1.5 times higher, respectively, than those of the QDs-based LEDs with a TOPO ligand. These results show that if the physical length of the surface ligand is relatively long, decreasing the surface area would result in increased injection of electrons and holes into the QDs, increasing the luminance and efficiency.

DOI 10.1166/jnn.2015.10560
Citations Scopus - 2
2015 Lee HG, Gopalan AI, Sai-Anand G, Kang SW, Lee KP, 'New heterojunction titanium dioxide nanowire as photocatalyst', Journal of Nanoscience and Nanotechnology, 15 7421-7425 (2015)

Copyright © 2015 American Scientific Publishers All rights reserved. Graphene and metal nanoparticles were incorporated into titanium dioxide nanowires. The heterojunction genera... [more]

Copyright © 2015 American Scientific Publishers All rights reserved. Graphene and metal nanoparticles were incorporated into titanium dioxide nanowires. The heterojunction generated in the titanium dioxide nanowires was beneficially utilized for photocatalytic degradation of Rhodamine-B.

DOI 10.1166/jnn.2015.10596
2015 Lee JS, Kim SW, Jang EY, Kang BH, Lee SW, Sai-Anand G, et al., 'Rapid and Sensitive Detection of Lung Cancer Biomarker Using Nanoporous Biosensor Based on Localized Surface Plasmon Resonance Coupled with Interferometry', Journal of Nanomaterials, 2015 (2015)

© 2015 Jae-Sung Lee et al. We propose a nanobiosensor to evaluate a lung cancer-specific biomarker. The nanobiosensor is based on an anodic aluminum oxide (AAO) chip and function... [more]

© 2015 Jae-Sung Lee et al. We propose a nanobiosensor to evaluate a lung cancer-specific biomarker. The nanobiosensor is based on an anodic aluminum oxide (AAO) chip and functions on the principles of localized surface plasmon resonance (LSPR) and interferometry. The pore-depth of the fabricated nanoporous AAO chip was 1 µm and was obtained using a two-step electrochemical anodization process. The sensor chip is sensitive to the refractive index (RI) changes of the surrounding medium and also provides simple and label-free detection when specific antibodies are immobilized on the gold-deposited surface of the AAO chip. In order to confirm the effectiveness of the sensor, the antibodies were immobilized on the surface of the AAO chip, and the lung cancer-specific biomarker was applied atop of the immobilized-antibody layer using the self-assembled monolayer method. The nanoporous AAO chip was used as a sensor system to detect serum amyloid A1, which is a lung cancer-specific biomarker. The specific reaction of the antigen-antibody contributes to the change in the RI. This in turn causes a shift in the resonance spectrum in the refractive interference pattern. The limit of detection (LOD) was found to be 100 ag/mL and the biosensor had high sensitivity over a wide concentration range.

DOI 10.1155/2015/183438
2014 Lee SH, Choi SH, Gopalan SA, Lee KP, Anantha-Iyengar G, 'Preparation of new self-humidifying composite membrane by incorporating graphene and phosphotungstic acid into sulfonated poly(ether ether ketone) film', International Journal of Hydrogen Energy, 39 17162-17177 (2014)

© 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved. In this work, a combination of constituent materials capable of improving the moisture ... [more]

© 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved. In this work, a combination of constituent materials capable of improving the moisture retention and proton conductivity (PC) was incorporated into sulfonated poly (ether ether ketone) (SPEEK) membranes in order to prepare new, self-humidifying composite membranes (SHMs) for proton exchange membrane fuel cells. The property-improving components were incorporated into the cast SPEEK film in an appropriate microstructural architecture to prepare the SHMs with increased water retention and PC. SHMs were therefore prepared with the inclusion of carboxyl-functionalized graphene (G(c)) and phosphotungstic acid (PWA) with varying proportions into the SPEEK film. The structure of the SPEEK/G(c)/PWA composite membranes was characterized by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, energy dispersive X-ray analysis, thermogravimetric analysis and X-ray photoelectron spectroscopy. The physicochemical properties of the composite membranes, such as ion exchange capacity, water uptake, thermal stability and PC, were investigated. This work provides confirmation that self-humidifying properties are improved at temperature above 60 °C through a combinational inclusion of G(c) and PWA within SPEEK and the new self-humidifying membranes have potential for use in medium temperature direct methanol fuel cells.

DOI 10.1016/j.ijhydene.2014.07.181
Citations Scopus - 7
2014 Lee JS, Yoon NR, Kang BH, Lee SW, Gopalan SA, Jeong HM, et al., 'Response characterization of a fiber optic sensor array with dye-coated planar waveguide for detection of volatile organic compounds', Sensors (Switzerland), 14 11659-11671 (2014)

We have developed a multi-array side-polished optical-fiber gas sensor for the detection of volatile organic compound (VOC) gases. The side-polished optical-fiber coupled with a p... [more]

We have developed a multi-array side-polished optical-fiber gas sensor for the detection of volatile organic compound (VOC) gases. The side-polished optical-fiber coupled with a polymer planar waveguide (PWG) provides high sensitivity to alterations in refractive index. The PWG was fabricated by coating a solvatochromic dye with poly(vinylpyrrolidone). To confirm the effectiveness of the sensor, five different sensing membranes were fabricated by coating the side-polished optical-fiber using the solvatochromic dyes Reinhardt's dye, Nile red, 4-aminophthalimide, 4-amino-N-methylphthalimide, and 4-(dimethylamino)cinnamaldehyde, which have different polarities that cause changes in the effective refractive index of the sensing membrane owing to evanescent field coupling. The fabricated gas detection system was tested with five types of VOC gases, namely acetic acid, benzene, dimethylamine, ethanol, and toluene at concentrations of 1, 2,...,10 ppb. Second-regression and principal component analyses showed that the response properties of the proposed VOC gas sensor were linearly shifted bathochromically, and each gas showed different response characteristics. © 2014 by the authors; licensee MDPI, Basel, Switzerland.

DOI 10.3390/s140711659
Citations Scopus - 7
2014 Sai-Anand G, Philips MF, Lee KP, Kang SW, Gopalan AI, 'Facile electrodeposition of flower like gold nanostructures on a conducting polymer support', Journal of Nanoscience and Nanotechnology, 14 3256-3261 (2014)

Herein, we report an attractive, simple and templateless synthetic method for the formation of anisotropic gold nanostructures. Gold &apos;mesoflowers&apos; consisting of arrays o... [more]

Herein, we report an attractive, simple and templateless synthetic method for the formation of anisotropic gold nanostructures. Gold 'mesoflowers' consisting of arrays of nanoplatelets were synthesized by electrochemical gold deposition on/off conditions onto a conducting poly(diphenylamine) (PDPA) support matrix. A possible forming mechanism of anisotropic gold nanostructures is presented. The electronic and electrochemical properties of gold nanoflower decorated PDPA in an assembled diode configuration were evaluated. Copyright © 2014 American Scientific Publishers.

DOI 10.1166/jnn.2014.8576
Citations Scopus - 5
2014 Han B, Gopalan SA, Lee KD, Kang BH, Lee SW, Lee JS, et al., 'Preheated solvent exposure on P3HT:PCBM thin film: A facile strategy to enhance performance in bulk heterojunction photovoltaic cells', Current Applied Physics, 14 1443-1450 (2014)

© 2014 Published by Elsevier B.V. In this study, we explored the ability of a preheated solvent (methanol) to induce characteristic changes at the organic active layer/metal inte... [more]

© 2014 Published by Elsevier B.V. In this study, we explored the ability of a preheated solvent (methanol) to induce characteristic changes at the organic active layer/metal interface, thereby improving the performance of fabricated organic photovoltaic (OPV) cells composed of poly(3-hexylthiopene) (P3HT) and a [6,6]-phenyl-C 71 -butyric acid methyl ester (PCBM) photoactive blend. Our results demonstrate that exposure to methanol (at room temperature, or preheated at 45 °C or 65 °C) improves the performance of the fabricated OPV cells. After preheated methanol exposure, the P3HT:PCBM thin films were tested for crystallinity, morphology, mobility, and photovoltaic characteristics. Our results revealed that use of the preheated solvent on the organic active layer significantly influences the micro/nano scale morphology and phase segregation of the P3HT:PCBM thin films, as well as the charge carrier mobility. It is hypothesized that the side chain ordering of P3HT and redistribution of PCBM could be results of the modified active layer. Consequently, OPV cells modified with the methanol preheated at 65 °C exhibited a power conversion efficiency (PCE) of 3.36%, with open-circuit voltage of 0.59 V, short-circuit current density of 13.83 mA/cm 2 , and fill-factor of 0.41. In contrast, the unmodified P3HT:PCBM thin film (without methanol exposure) showed a PCE of only 2.13%.

DOI 10.1016/j.cap.2014.08.010
Citations Scopus - 14
2014 Sai-Anand G, Gopalan AI, Kang SW, Komathi S, Lee KP, 'One pot synthesis of new gold nanoparticles dispersed poly(2-aminophenyl boronic acid) composites for fabricating an affinity based electrochemical detection of glucose', Science of Advanced Materials, 6 1356-1364 (2014)

In this investigation, a facile one step synthesis was utilized to prepare gold nanoparticles (Au NPs) dispersed poly(2-aminophenyl boronic acid) (PAPBA) nanocomposite (PAPBA/Au-N... [more]

In this investigation, a facile one step synthesis was utilized to prepare gold nanoparticles (Au NPs) dispersed poly(2-aminophenyl boronic acid) (PAPBA) nanocomposite (PAPBA/Au-NC). PAPBA/Au-NC was characterized by field effect scanning electron microscopy, Fourier transform infrared spectroscopy and thermogravimetric analysis. The synergistic properties of the boronic groups, conducting polyaniline matrix and Au NPs in the new PAPBA/Au-NC were effectively utilized for the fabrication of a high sensitive non-enzymatic glucose sensor electrode. The sensor electrode was characterized by cyclic voltammetry and electrochemical impedance spectroscopy. We demonstrated that the new non-enzymatic sensor electrode exhibited good electrocatalytic activity for the oxidation of glucose. The Au NPs, PANI and boronic groups synergistically influence electrochemical detection of glucose. PAPBA/Au-NC exhibited excellent selectivity for glucose, good electron transduction to the electrode and high electrochemical sensitivity. The greater progress achieved in this investigation will pave the way for the potential development of a practical non-enzymatic glucose sensor. © 2014 by American Scientific Publishers.

DOI 10.1166/sam.2014.1836
Citations Scopus - 6
2014 Lee HG, Sai-Anand G, Lee KP, Kang SW, Gopalan AI, 'Development of novel electrospun functional nanofibrous mats for efficient uranium/lithium recovery', Science of Advanced Materials, 6 1365-1374 (2014)

In this study, we developed new types of amidoxime functionalized nanofibrous mats and utilized them for trace level detection or extraction of uranium ions. Electrospun poly(acry... [more]

In this study, we developed new types of amidoxime functionalized nanofibrous mats and utilized them for trace level detection or extraction of uranium ions. Electrospun poly(acrylonitrile) (PAN-ESF) mats had been enriched with surface rich cyano groups using a polymer (Silica-CN) to obtain Silica-CN incorporated electrospun composite nanofibers (PAN/Silica-CN-ESCF) and subsequently, the mats were post modified to obtain amidoxime enriched composite nanofibrous (AOER-ESCF) mats. For comparative purposes, pristine PAN electrospun fibers (PAN-ESF) were also modified to obtain simple amidoximated electrospun fibers (AO-ESF). The changes in the surface morphology and structural characteristics between PAN-ESF, PAN/Silica-CN-ESCF, AO-ESF and AOER-ESCF were evaluated by field emission scanning electron microscopy, Fourier transform infrared spectroscopy and thermogravimetric analysis. The uranium ion sorption capacity of the AO-ESF and AOER-ESCF adsorbents was evaluated and compared. The nanostructures and the additional component in the ESCF provide a high surface area and cyano groups for enriching the amidoxime groups to obtain AOER-ESCF. Our results show that AOER-ESCF adsorbent has a high uranium ion extraction capacity for a wider uranium concentration range compared to simple AO-ESF. This new strategy of modifying ESF has also been extended to the development of lithium ion extraction adsorbents through the inclusion of spinel into the PAN-ESF. © 2014 by American Scientific Publishers.

DOI 10.1166/sam.2014.1799
Citations Scopus - 1
2014 Gopalan SA, Seo MH, Anantha-Iyengar G, Han B, Lee SW, Kwon DH, et al., 'Mild wetting poor solvent induced hydrogen bonding interactions for improved performance in bulk heterojunction solar cells', Journal of Materials Chemistry A, 2 2174-2186 (2014)

In this paper, we demonstrate a facile, mild wetting (short residence time) poor solvent [isopropyl alcohol (IPA)] treatment, carried out on the top surface of a spin-cast poly (3... [more]

In this paper, we demonstrate a facile, mild wetting (short residence time) poor solvent [isopropyl alcohol (IPA)] treatment, carried out on the top surface of a spin-cast poly (3-hexylthiopene) (P3HT) and [6,6] -phenyl-C71- butyric acid methyl ester (PCBM) blend film, in order to fabricate high-performance polymer solar cells (PSCs). This method utilizes the hydrophilic and polar/hydrogen bonding interactions of IPA with the blend components (P3HT and PCBM). The photovoltaic (PV) performance of the fabricated PSCs was optimized by utilizing a preheated IPA wetting treatment and devices fabricated with the configuration: ITO/PEDOT:PSS/P3HT:PCBM/M-IPA-T°/Al (T°: 25°C/45°C/65°C/85°C) (where "M" stands for modified IPA and "T" signifies the temperature used for the IPA wetting). Our investigation encompasses electrical, optical, crystalline, and morphological studies on the P3HT:PCBM blend films,modified by preheated IPA, to elucidate the associated enhancements in the PV characteristics and performance. The device fabricated with IPA-85°C (ITO/PEDOT:PSS/P3HT:PCBM/M- IPA-85°C/Al) exhibited the best power conversion efficiency (PCE) of 3.51%, with an open circuit voltage of 0.65 V, a fill factor of 0.52, and a short-circuit current density of 10.20 mA cm -2 . In contrast, the non-modified blend film device showed a PCE of only ~3.04%. Ultraviolet-visible absorption studies and X-ray diffraction results suggest that the use of the pre-heated mild-wetting IPA treatment improves the crystallinity and self-organization of the blend layer. We rationalize our findings based on the interactions between IPA and the blend components, due to its high polar and hydrogen bonding Hansen solubility parameters to impart supramolecular assembly of P3HT chains during the blend film formation. This is the first report demonstrating that the poor solvent (IPA) can induce an optimal phase separation in a P3HT:PCBM blend through our proposed mild wetting preheated treatment, toward achieving high-performance PSCs. © 2014 The Royal Society of Chemistry.

DOI 10.1039/c3ta13875e
Citations Scopus - 16
2013 Komathi S, Gopalan AI, Kim S-K, Anand GS, Lee K-P, 'Fabrication of horseradish peroxidase immobilized poly(N-[3-(trimethoxy silyl)propyl]aniline) gold nanorods film modified electrode and electrochemical hydrogen peroxide sensing', Electrochimica Acta, 92 71-78 (2013)
DOI 10.1016/j.electacta.2013.01.032
2013 Anand GS, Gopalan AI, Kang S-W, Lee K-P, 'Development of a surface plasmon assisted label-free calorimetric method for sensitive detection of mercury based on functionalized gold nanorods', Journal of Analytical Atomic Spectrometry, 28 488-488 (2013)
DOI 10.1039/c3ja30300d
2013 Sai-Anand G, Gopalan AI, Kang SW, Lee KP, 'Fabrication of gold nanoflower anchored conducting polymer hybrid film electrode by pulse potentiostatic deposition', IEEE Electron Device Letters, 34 1065-1067 (2013)

In this letter, we report a simple and rapid (~ 60 s) method to fabricate a new organic-inorganic hybrid film based on poly (di phenyl amine-co-4 amino thiophenol) (designated as ... [more]

In this letter, we report a simple and rapid (~ 60 s) method to fabricate a new organic-inorganic hybrid film based on poly (di phenyl amine-co-4 amino thiophenol) (designated as PDPAAT) and gold nanoflowers (Au NFs). The fabrication involves a fast facile and pulse potentiostatic approach for the electrodeposition of Au NFs onto PDPAAT. The electrochemical, interfacial, and optical properties of the PDPAAT/Au NF hybrid film electrode are investigated. The superior electroactivity, electrochemical, and interfacial characteristics of the PDPAAT/Au NF electrode suggests its suitability for sensor, electrocatalysis, and diode applications. © 1980-2012 IEEE.

DOI 10.1109/LED.2013.2266669
Citations Scopus - 7
2013 Gopalan AI, Komathi S, Sai Anand G, Lee KP, 'Nanodiamond based sponges with entrapped enzyme: A novel electrochemical probe for hydrogen peroxide', Biosensors and Bioelectronics, 46 136-141 (2013)

A &quot;modular approach&quot; has been demonstrated for the preparation of nanodiamond (ND) based sponges (NS) with entrapped enzyme (horseradish peroxidase, HRP) (ND-NS(HRP)) an... [more]

A "modular approach" has been demonstrated for the preparation of nanodiamond (ND) based sponges (NS) with entrapped enzyme (horseradish peroxidase, HRP) (ND-NS(HRP)) and utilization as an electrochemical probe for detection of hydrogen peroxide (H 2 O 2 ). ND-NS comprises ND, porous poly(aniline)-poly(2-acrylamido 2-methyl propane sulfonic acid) (PANI-PAMPSA) network and entrapped HRP. Field emission scanning electron microscope image of ND-NS(HRP) reveals sponge like suprastructure comprising interconnected nanospheres with numerous openings/pinholes/cavities. The entrapped HRP in ND-NS exhibits effective direct electron transfer with an electron transfer rate constant of 1.85s -1 . ND-NS(HRP) exhibited excellent bioelectrocatalytic reduction of hydrogen peroxide (H 2 O 2 ) with a wide linear concentration range (1-45mM), quick response (5s), high sensitivity (129.6µAM -1 ) and low detection limit 59µM (S/N=3). © 2013 Elsevier B.V.

DOI 10.1016/j.bios.2013.02.036
Citations Scopus - 31
2013 Seo MH, Kim KJ, Han BY, Anand GS, Kim SH, Lee SW, Kang SW, 'Effect of Solvent Annealing for Efficient Polymer Solar Cells', Advanced Materials Research, 724-725 147-150 (2013)
DOI 10.4028/www.scientific.net/AMR.724-725.147
2011 Gopalan SA, Park JT, 'Energy-efficient MAC protocols for wireless body area networks: A survey', China Communications, 8 1-10 (2011)

In this paper, we provide a comprehensive survey of key energy-efficient Medium Access Control (MAC) protocols for Wireless Body Area Networks (WBANs). At the outset, we outline t... [more]

In this paper, we provide a comprehensive survey of key energy-efficient Medium Access Control (MAC) protocols for Wireless Body Area Networks (WBANs). At the outset, we outline the crucial attributes of a good MAC protocol for WBAN. Several sources that contribute to the energy inefficiency of WBAN are identified, and features of the various MAC protocols qualitatively compared. Then, we further investigate some representative TDMA-based energy-efficient MAC protocols for WBAN by emphasizing their strengths and weaknesses. Finally, we conclude with a number of open research issues with regard to WBAN MAC layer.

Citations Scopus - 2
2010 Anand GS, Komathi S, Gopalan AI, Lee K-P, 'Fabrication of a Self-Powered Glucose Sensor Using Carbon Nanotube-Based Nanomesh and Direct Electron Transfer: A Prospective Approach for Energy Harvesting in Sensor Networks', Journal of Nanoelectronics and Optoelectronics, 5 129-134 (2010)
DOI 10.1166/jno.2010.1078
Show 30 more journal articles

Conference (5 outputs)

Year Citation Altmetrics Link
2015 Kim SW, Cha SH, Kang BH, Lee SW, Lee JS, Kim JS, et al., 'Optical gas sensor based on LSPR using ZnO nanoparticles and AAO nanostructure', 2015 IEEE SENSORS - Proceedings (2015)

© 2015 IEEE. In this study, we proposed optical gas sensor based on anodized aluminum oxide (AAO) using ZnO nanoparticles. A thin layer of Ni, Au deposited AAO structure was used... [more]

© 2015 IEEE. In this study, we proposed optical gas sensor based on anodized aluminum oxide (AAO) using ZnO nanoparticles. A thin layer of Ni, Au deposited AAO structure was used as substrate, and ZnO nanoparticle layer that was used by sensing membrane was formed by spin coating on the AAO chip. A Ni, Au layer was fabricated to enhance the localized surface plasmon resonance (LSPR) phenomena and ZnO layer was deposited as gas reaction layer. The ZnO nanoparticles have reactivity with Ethanol gas, this reaction make the surface refractive index changes that can be detected by reflected wavelength shift measurements. We collected and plotted peak point of this reflected wave according to ethanol gas concentration. By analyzing this results, we verified that proposed sensor can detect ethanol gas to 5 ppb.

DOI 10.1109/ICSENS.2015.7370399
2015 Lee JS, Yoon NR, Kang BH, Lee SW, Sai-Anand G, Kim SW, et al., 'Selective sensing for the detection of volatile organic compounds using optical fiber sensor with dye-coated planar waveguide', Sensor Letters (2015)

Copyright © 2015 American Scientific Publishers All rights reserved. In this work, we have used solvatochromic dyes for the fabrication of sensing membranes on a side-polished op... [more]

Copyright © 2015 American Scientific Publishers All rights reserved. In this work, we have used solvatochromic dyes for the fabrication of sensing membranes on a side-polished optical fiber block using the spin-coating method to develop a volatile organic compound (VOC) gas sensor. The device utilizes the change in the refractive index of the evanescent field coupling in the clad region to detect VOCs. The sensor was coupled with a polymer planar waveguide (PWG), which possessed high sensitivity to change in the refractive index values. The PWG was fabricated by coating the solvatochromic dye with poly(vinyl-pyrrolidone) (PVP). In order to confirm the effectiveness of the sensor, two different sensing membranes were fabricated by coating the side-polished optical fiber with different solvatochromic dyes having different polarities. Contact of the VOC gases with the sensing membranes caused changes in the effective refractive index of the membranes due to evanescent field coupling. The fabricated gas detection system was tested with two types of VOCs. The concentration of the VOCs was varied from 1 ppb to 10 ppb in intervals of 1 ppb. Polynomial-regression analysis showed that the response properties of the proposed VOC gas sensor were bathochromically shifted in a linear fashion and the gases exhibited distinct response properties.

DOI 10.1166/sl.2015.3482
2010 Seo SH, Gopalan SA, Chun SM, Seok KJ, Nah JW, Park JT, 'An energy-efficient configuration management for multi-hop wireless body area networks', Proceedings - 2010 3rd IEEE International Conference on Broadband Network and Multimedia Technology, IC-BNMT2010 (2010)

In this paper, a heuristic adaptive routing algorithm for an energy-efficient configuration management has been suggested which can reduce energy consumption while guaranteeing Qo... [more]

In this paper, a heuristic adaptive routing algorithm for an energy-efficient configuration management has been suggested which can reduce energy consumption while guaranteeing QoS for the emergency data in wireless body area networks (WBANs). The priority and vicinity of the nodes are taken into account for the selection of reachable parent nodes, when the nodes are disconnected due to the mobile nature of human body. We derive a mathematical model and presented algorithm for maintaining balanced power consumption with guaranteed QoS. A simulation has been performed to evaluate the performance of the proposed heuristic algorithm. © 2010 IEEE.

DOI 10.1109/ICBNMT.2010.5705287
Citations Scopus - 18
2010 Gopalan SA, Kim DH, Nah JW, Park JT, 'A survey on power-efficient MAC protocols for wireless body area networks', Proceedings - 2010 3rd IEEE International Conference on Broadband Network and Multimedia Technology, IC-BNMT2010 (2010)

Design of power-efficient medium access control (MAC) protocols in wireless body area networks (WBANs) is important as it helps to prolong the network lifetime. This paper attempt... [more]

Design of power-efficient medium access control (MAC) protocols in wireless body area networks (WBANs) is important as it helps to prolong the network lifetime. This paper attempts to survey recent works of power efficient MAC protocols for WBANs and presents a comparison of the approaches pursued. We investigate a few MAC protocols devised for WBAN by highlighting their salient features. Finally, a number of open research issues are discussed. © 2010 IEEE.

DOI 10.1109/ICBNMT.2010.5705286
Citations Scopus - 7
2010 Gopalan SA, Park JT, 'Energy-efficient MAC protocols for wireless body area networks: Survey', 2010 International Congress on Ultra Modern Telecommunications and Control Systems and Workshops, ICUMT 2010 (2010)

In this paper, we provide a comprehensive survey of recent energy-efficient medium access control (MAC) protocols for wireless body area networks (WBANs) and presents a comparison... [more]

In this paper, we provide a comprehensive survey of recent energy-efficient medium access control (MAC) protocols for wireless body area networks (WBANs) and presents a comparison of the various approaches pursued. At the outset, we outline the crucial attributes for a good MAC. Several sources that contribute to the energy inefficiency are identified. Then, we investigate few MAC protocols devised for WBAN by emphasizing their salient features. As a conclusion, we put forward a number of open research challenges with regard to prospects of medium access techniques and other issues. ©2010 IEEE.

DOI 10.1109/ICUMT.2010.5676554
Citations Scopus - 49
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Dr Sai Anand Gopalan

Position

Research Associate
Prof. Ajayan Vinu's Group
Office - DVC (Research and Innovation)
Research and Innovation Division

Contact Details

Email saianand.gopalan@newcastle.edu.au
Phone (02) 4033 9605

Office

Room NIERC-130
Building NIER Block C
Location Callaghan
University Drive
Callaghan, NSW 2308
Australia
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