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Direct Electrodeposition of Porous Gold Nanowire Arrays for Biosensing Applications
Author(s) -
Zhang Xinyi,
Li Dan,
Bourgeois Laure,
Wang Huanting,
Webley Paul A.
Publication year - 2009
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.200800538
Subject(s) - nanowire , materials science , glucose oxidase , nanotechnology , biosensor , electrode , dielectric spectroscopy , porosity , electrochemistry , electrocatalyst , colloidal gold , chemical engineering , chemistry , nanoparticle , composite material , engineering
Nanochannel alumina templates are used as templates for fabrication of porous gold nanowire arrays by a direct electrodeposition method. After modification with glucose oxidase, a porous gold nanowire‐array electrode is shown to be an excellent electrochemical biosensor for the detection of glucose. The picture shows an SEM image of a nanowire array after removal of the alumina template by acid dissolution.We report the fabrication of porous gold nanowire arrays by means of a one‐step electrodeposition method utilizing nanochannel alumina templates. The microstructure of gold nanowires depends strongly on the current density. The formation of porous gold nanowires is attributed to disperse crystallization under conditions of low nucleation rate. Interfacial electron transport through the porous gold nanowires is studied by electrochemical impedance spectroscopy. Cyclic voltammetric studies on the porous gold nanowire arrays reveal a low‐potential electrocatalytic response towards hydrogen peroxide. The properties of the glucose oxidase modified porous gold nanowire array electrode are elucidated and compared with those of nonporous enzyme electrodes. The glucose oxidase modified porous gold nanowire‐array electrode is shown to be an excellent electrochemical biosensor for the detection of glucose.