title: One-step fabrication of bio-functionalized nanoporous gold/poly(3,4-ethylenedioxythiophene) hybrid electrodes for amperometric glucose sensing.
abstract: 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 ~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 μA mM(-1) cm(-2) and a wide linear range of 0.1-15 mM, making it suitable for reliable analytic applications.
authors.affiliation: Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, School of Materials Science and Engineering, Shandong University, Jinan 250061, People's Republic of China.
authors.forename: Xinxin
authors.initials: X
authors.lastname: Xiao
authors.forename: Meng'en
authors.initials: M
authors.lastname: Wang
authors.forename: Hui
authors.initials: H
authors.lastname: Li
authors.forename: Pengchao
authors.initials: P
authors.lastname: Si
mesh_terms: D016227:Benzoquinones / Q000737:chemistry; D015374:Biosensing Techniques; D019086:Bridged Bicyclo Compounds, Heterocyclic / Q000737:chemistry*; D002138:Calibration; D055664:Electrochemical Techniques; D004566:Electrodes; D004800:Enzymes, Immobilized / Q000737:chemistry; D005947:Glucose / Q000032:analysis*; D005949:Glucose Oxidase / Q000737:chemistry; D006046:Gold / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D016062:Porosity; D012680:Sensitivity and Specificity; D012996:Solutions
chemical_list: D016227:Benzoquinones; D019086:Bridged Bicyclo Compounds, Heterocyclic; D004800:Enzymes, Immobilized; D011108:Polymers; D012996:Solutions; C121383:poly(3,4-ethylene dioxythiophene); C004532:quinone; D006046:Gold; D005949:Glucose Oxidase; D005947:Glucose
keywords: Electropolymerization; Glucose biosensor; Nanoporous gold; Poly(3,4-ethylenedioxythiophene)