PEDOT:PSS–MODIFIED PLATINUM MICROELECTRODES FOR MEASUREMENTS IN AQUEOUS MEDIA: EFFECT OF POLYMER SURFACE AREA ON LONG-TERM ANODIC PEAK CURRENT STABILITY

  • Wan Wardatul Amani Wan Salim International Islamic University Malaysia
  • Abdelmohsen Benoudjit International Islamic University Malaysia
  • Habibah Farhana Abdul Guthoos International Islamic University Malaysia
  • Farrah Aida Arris International Islamic University Malaysia

Abstract

Contamination of drinking water by hazardous agents is becoming a serious global threat, so it is necessary to develop more efficient sensing technologies for applications in liquid media. The limited working lifetime of electrochemical biosensors, especially when measurements are made continuously in liquid media, remains an unsolved challenge. We studied the effect of PEDOT:PSS surface area on platinum microelectrodes with respect to electrode ability to conduct reversible ion-to-electron transduction in liquid media. Electropolymerization of 3,4-ethylenedioxythiophene:poly(styrene sulfonate) EDOT:PSS to poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) was conducted on microplatinum electrodes 5 and 10 mm long using a galvanostatic mode. Cyclic voltammetry was used to determine capacitive peak current; higher peak current indicates higher redox capacitance. Field-emisison scanning-electron microscopy was used to study the surface morphology of the PEDOT:PSS transucer layer after measurement in liquid media. The anodic capacitive peak currents did not differ significantly between the two electrodes at day one (~0.20 mA); however, peak current decreased by ~ 20% and ~ 80% at day six for 10- and-5 mm electrode lengths, respectively. The results imply that PEDOT:PSS surface area plays a role in transduction of PEDOT:PSS in aqueous media.

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Author Biographies

Wan Wardatul Amani Wan Salim, International Islamic University Malaysia

Wan Wardatul Amani Wan Salim, Ph.D., Assistant Professor in the Biotechnology Department at International Islamic University of Malaysia (IIUM), received her B.Sc.and M.Sc. in Electrical Engineering from the University of Minnesota Twin Cities in 2001 and 2003 respectively, and her Ph.D. in BioMEMS and Microelectronics from the Weldon School of Biomedical Engineering at Purdue University in 2009.

Prior to her position at IIUM, she was an academician at Purdue University, West Lafayette, IN, USA, and was appointed as the Principal Investigator on a NASA Small Satellite project (www.sporesat.org); the satellite was launched on April 2014. Her research focuses on multidisciplinary approaches for the development of advanced sensor technologies, and the applications of these technologies towards answering important questions in agriculture, biology, environmental science, medicine, and space biology. She has done extensive work with biological-micro-electro-mechanical systems (bio-MEMS).

Dr. Amani has published numerous research articles in journals such as Langmuir,  Nanotechnology and Lab on a chip. She received the Thora W. Halstead Young Investigator's Award in 2012 from the American Society for Gravitational and Space Research (ASGSR), was awarded the Best Researcher Award from IIUM in 2015, and was the recipient of a 2015 Malaysia L’Oréal – UNESCO Fellowship for Women in Science.

Abdelmohsen Benoudjit, International Islamic University Malaysia

Benoudjit Abdelmohsen received his B.Sc. (Hons) degree in Biology and Physiology of Animals from University of El Hadj Lakhdar, Batna, Algeria, in 2008. His research interests are in using conductive polymers as transducers for electrochemical sensors for application in liquid media.

Habibah Farhana Abdul Guthoos, International Islamic University Malaysia

Habibah Farhana Abdul Guthoos received her B.E. (Hons) degree in Biochemical and Biotechnology Engineering from International Islamic University Malaysia (IIUM) in 2015. Her research interests are in optimization of performance parameters of enzymatic electrochemical sensors for application in liquid media.

Farrah Aida Arris, International Islamic University Malaysia

Farrah Aida Arris received her B.Ch.E. degree in Chemical Engineering from the University of Minnesota, Minneapolis-St. Paul, USA, in 2005, and is currently pursuing her M.Sc. in Biotechnology Engineering from International Islamic University Malaysia (IIUM) Gombak, Malaysia. Her research interests include characterization of carbon-based nanocomposites for electrochemical sensors in biomedical and environmental applications.

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Published
2017-12-01
How to Cite
Wan Salim, W. W. A., Benoudjit, A., Abdul Guthoos, H. F., & Arris, F. A. (2017). PEDOT:PSS–MODIFIED PLATINUM MICROELECTRODES FOR MEASUREMENTS IN AQUEOUS MEDIA: EFFECT OF POLYMER SURFACE AREA ON LONG-TERM ANODIC PEAK CURRENT STABILITY. IIUM Engineering Journal, 18(2), 11-15. https://doi.org/10.31436/iiumej.v18i2.715
Section
Chemical and Biotechnology Engineering