PEDOT:PSS–MODIFIED PLATINUM MICROELECTRODES FOR MEASUREMENTS IN AQUEOUS MEDIA: EFFECT OF POLYMER SURFACE AREA ON LONG-TERM ANODIC PEAK CURRENT STABILITY
DOI:
https://doi.org/10.31436/iiumej.v18i2.715Abstract
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.Downloads
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References
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[10] Z. Wang, J. Xu, Y. Yao, L. Zhang, Y. Wen, H. Song, & D. Zhu, “Facile preparation of highly water-stable and flexible PEDOT: PSS organic/inorganic composite materials and their application in electrochemical sensors.†Sensors and Actuators B: Chemical, vol. 196, pp. 357-369, 2014.
[2] V. Perumal, & U. Hashim, “Advances in biosensors: principle, architecture, and applications.†Journal of Applied Biomedicine, vol. 12(1), pp. 1-15, 2014.
[3] K. Amini, & H. Kraatz, “Recent developments in biosensor technologies for pathogen detection in water.†JSM Environmental Science & Ecology, vol. 3(1), pp. 1012, 2015.
[4] M. N. Velasco-Garcia, & T. Mottram, “Biosensor technology addressing agricultural problems.†Biosystems Engineering, vol. 84(1), pp. 1-12, 2003.
[5] U. Yogeswaran, & S. M. Chen, “A review on the electrochemical sensors and biosensors composed of nanowires as sensing material.†Sensors, vol. 8(1), pp. 290-313, 2008.
[6] X. Yang, J. Kirsch, E. V. Olsen, J. W. Fergus, & A. L. Simonian, “Anti-fouling PEDOT: PSS modification on glassy carbon electrodes for continuous monitoring of tricresyl phosphate.†Sensors and Actuators B: Chemical, vol. 177, pp. 659-667, 2013.
[7] Q. Jiang, C. Liu, H. Song, J. Xu, D. Mo, H. Shi, Z. Wang, F. Jiang, B. Lu, & Z. Zhu, “Free-standing PEDOT: PSS Film as an electrode for the electrodeposition of bismuth telluride and its thermoelectric performance.†Int. J. Electrochem. Sci, vol. 9, pp. 7540-7551, 2014.
[8] W. W. Salim, A. C. Hermann, M. A. Zietchek, J. E. Pfluger, J. H. Park, A. ul Haque, & D. M. Porterfield, “Ion-selective electrode biochip for applications in a liquid environment.†In International Conference for Innovation in Biomedical Engineering and Life Sciences, , pp. 86-93. Springer Singapore, 2015.
[9] H. Zhang, J. Xu, Y. Wen, Z. Wang, J. Zhang, & W. Ding, “Conducting poly (3, 4-ethylenedioxythiophene): poly (styrene-sulfonate) film electrode with superior long-term electrode stability in water and synergistically enhanced electrocatalytic ability for application in electrochemical sensors.†Synthetic Metals, vol. 204, pp. 39-47, 2015.
[10] Z. Wang, J. Xu, Y. Yao, L. Zhang, Y. Wen, H. Song, & D. Zhu, “Facile preparation of highly water-stable and flexible PEDOT: PSS organic/inorganic composite materials and their application in electrochemical sensors.†Sensors and Actuators B: Chemical, vol. 196, pp. 357-369, 2014.
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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
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Chemical and Biotechnology Engineering