Synthesis of Nanoporous Gold Electrode and Its Application in Electrochemical Sensor

In ammonia solution, binary gold-silver alloy films were directly deposited onto indium tin oxide (ITO) substrate surfaces using electrochemical method from chloroauric acid and silver nitrate. Then high-surface-area nanoporous gold (NPG) film modified electrodes were fabricated by chemical dealloyi...

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Bibliographic Details
Published in:Fēnxī huàxué 2013-05, Vol.41 (5), p.693-697
Main Authors: Zhu, Xiao-Ting, Zhang, Lu-Jia, Tao, Hong, Di, Jun-Wei
Format: Article
Language:English
Subjects:
Electrodes
Gold
Indium tin oxide
Nanocomposites
Nanomaterials
Nanostructure
Silver
Standard deviation
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Summary:In ammonia solution, binary gold-silver alloy films were directly deposited onto indium tin oxide (ITO) substrate surfaces using electrochemical method from chloroauric acid and silver nitrate. Then high-surface-area nanoporous gold (NPG) film modified electrodes were fabricated by chemical dealloying of the less noble component silver from the surface. The modified electrodes were characterized. The electrode can be successfully functionalized with self-assembled monolayers of L-cysteine, which can be applied to the sensitive and selective determination of Cu(2+). Under the optimal conditions and 5 min of absorption time for Cu(2+) ions, the cathodic current was linear proportional with Cu(2+) concentration from 0.05 to 4 mu mol/L with a detection limit of 0.03 mu mol/L. The relative standard deviation was 4.3% for 1 mu mol/L Cu(2+) solution. The established method was successfully applied for the determination of Cu(2+) in water sample of environment.
ISSN:0253-3820
DOI:10.3724/SP.J.1096.2013.30051