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

Prosper Kanyong, Sean Rawlinson, James Davis

Research output: Contribution to journalArticle

30 Citations (Scopus)
28 Downloads (Pure)

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.
Original languageEnglish
Pages (from-to)528-534
JournalSensors and Actuators B: Chemical
Volume233
Early online date21 Apr 2016
DOIs
Publication statusPublished - 5 Oct 2016

Keywords

  • Square Wave Voltammetry
  • Cyclic Voltammetry
  • Electrochemical Impedance Spectroscopy
  • Dopamine
  • Organocatalyst
  • Thin Films

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