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Fabrication and electrochemical characterization of polydopamine redox polymer modified screen-printed carbon electrode for the detection of guanine

Kanyong, Prosper, Rawlinson, Sean and Davis, James (2016) Fabrication and electrochemical characterization of polydopamine redox polymer modified screen-printed carbon electrode for the detection of guanine. Sensors and Actuators B: Chemical, 233 . pp. 528-534. [Journal article]

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URL: http://www.sciencedirect.com/science/article/pii/S0925400516305810

DOI: 10.1016/j.snb.2016.04.099

Abstract

A modified screen-printed carbon electrode (SPCE) was fabricated by electrodeposition of dopamine to create a suitable polydopamine (PDA) redox polymer for sensing applications. The fabricated sensor, designated as PDA-SPCE, was characterized by electrochemical impedance spectroscopy, contact angle measurements and chronoamperometry. The surface coverage of redox species on the polymer film was optimized and found to be ~6.1 x 10-6 mol.cm-2. Using square wave voltammetry, the PDA-SPCE was used to facilitate and observe the electrocatalytic oxidation of guanine at different concentrations. A calibration curve for guanine was constructed, with a sensitivity of 90.5 μA.μM-1.cm-2 and a limit of detection (based on 3x the baseline noise) of 15.8 µM.

Item Type:Journal article
Keywords:Square Wave Voltammetry, Cyclic Voltammetry, Electrochemical Impedance Spectroscopy, Dopamine, Organocatalyst, Thin Films
Faculties and Schools:Faculty of Computing & Engineering
Faculty of Computing & Engineering > School of Engineering
Research Institutes and Groups:Engineering Research Institute
Engineering Research Institute > Nanotechnology & Integrated BioEngineering Centre (NIBEC)
ID Code:34945
Deposited By: Dr Prosper Kanyong
Deposited On:19 Aug 2016 13:55
Last Modified:06 Sep 2017 10:44

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