Journal
TALANTA
Volume 116, Issue -, Pages 1054-1059Publisher
ELSEVIER
DOI: 10.1016/j.talanta.2013.08.014
Keywords
Nanoporous gold; Poly(3,4-ethylenedioxythiophene); Glucose biosensor; Electropolymerization
Categories
Funding
- National 973 Program Project of China [2012CB932800]
- Shandong University [31370056431211, 31370070-614018]
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We report a simple, one-step synthesis of hybrid film by electropolymerizing 3,4-ethylenedioxythiophene (EDOT) on nanoporous gold (NPG) for applications in amperometric glucose biosensors. The enzyme, glucose oxidase (GOx), is entrapped into poly(3,4-ethylenedioxythiophene) (PEDOT) matrix, simultaneously. Scanning electron microscope (SEM) and transmission electron microscopy (TEM) studies show the NPG preserve its original bicontinuous nanoporous structure and the PEDOT film grows uniformly with a thickness of similar to 10 nm. The modified electrodes have been investigated by cyclic voltammetry (CV) and single potential step chronoamperometry (SPSC). The influence of PEDOT film's thickness has been explored to optimize sensor behaviors. Mediated by p-benzoquinone (BQ), the calibration curves have been obtained by applying relatively low constant potential of 200 mV (vs. SCE). The NPG/PEDOT/GOx (2CVs) biosensor exhibits high sensitivity of 7.3 mu A mM(-1) cm(-2) and a wide linear range of 0.1-15 mM, making it suitable for reliable analytic applications. (C) 2013 Elsevier B.V. All rights reserved.
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