Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 233, Issue -, Pages 528-534Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2016.04.099
Keywords
Square wave voltammetry; Cyclic voltammetry; Electrochemical impedance spectroscopy; Dopamine; Organocatalyst; Thin films
Funding
- Department of Employment and Learning Ireland [USI035]
- National Institutes of Health [5R01ES003154-30]
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A modified screen-printed carbon electrode (SPCE) was fabricated by electrodeposition of dopamine to create a suitable polydopamine (PDA) redox polymer film 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 similar to 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 mu A mu M-1 cm(-2) and a limit of detection (based on 3x the baseline noise) of 15.8 mu M. (C) 2016 Elsevier B.V. All rights reserved.
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