The facile and simple synthesis of poly(3,4ethylenedioxythiophene) anchored reduced graphene oxide nanocomposite for biochemical analysis

Bose Dinesh, A. T.Ezhil Vilian, Cheol Hwan Kwak, Yun Suk Huh, Ramiah Saraswathi, Young Kyu Han

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

In this article, we demonstrate the potentiostatic electrodeposition of poly(3,4-ethylenedioxythiophene) (PEDOT) on reduced graphene oxide (RGO) to develop a nanocomposite-modified electrode that separates three coexisting biofluids – ascorbic acid (AA), dopamine (DA), and uric acid (UA) – in a 0.1 M Phosphate buffer solution at a physiological pH (7.4). The texture, physicochemical properties, and electrochemical behavior of the PEDOT-RGO were explored using UV–visible spectroscopy, Raman spectroscopy, X-ray photoelectron spectroscopy, electron microscopic techniques, and electrochemical impedance spectroscopy (EIS). A PEDOT-RGO/GCE was evaluated with respect to a bare GCE, RGO/GCE, and PEDOT/GCE for the simultaneous sensing of AA, DA, and UA. The difference in voltammetric peak potentials was about 180 mV between AA and DA and 120 mV between DA and UA. The differential pulse voltammetric sensor provided a linear calibration for a wide concentration range (0.1–907 μM for AA, 0.1–901 μM for DA, and 0.1–701 μM for UA) with detection limits of 1.5 μM, 0.6 μM, and 0.2 μM for AA, DA, and UA, respectively. The developed sensor was validated by the detection of AA, DA, and UA in a vitamin C tablet, a dopamine hydrochloride injection, and human serum samples.

Original languageEnglish
Pages (from-to)150-159
Number of pages10
JournalAnalytica Chimica Acta
Volume1077
DOIs
StatePublished - 24 Oct 2019

Keywords

  • Ascorbic acid
  • Dopamine
  • PEDOT
  • Reduced graphene oxide
  • Simultaneous determination
  • Uric acid

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