Covalent anchoring of multifunctionized gold nanoparticles on electrodes towards an electrochemical sensor for the detection of cadmium ions

Guozhen Liu*, Yin Zhang, Meng Qi, Fengjuan Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

This paper reports an electrochemical sensor based on the covalent anchoring of aryldiazonium salt modified AuNPs to gold electrodes for the sensitive detection of cadmium ions (Cd2+). AuNPs modified with 4-nitrophenyl and 4-carboxylphenyl were first prepared, which were then immobilized in situ on gold electrodes to achieve Au-Ph-AuNP modified interfaces. Glutathione (GSH) was finally modified to Au-Ph-AuNP by amide bonding to achieve an Au-Ph-AuNP-GSH sensing interface, which was used to detect Cd2+ over the concentration range from 0.1 nM to 100 nM with a detection limit of 0.1 nM. This electrochemical sensor demonstrated high stability and sensitivity to Cd2+. It has potential use in an in situ anchoring AuNP strategy to fabricate portable devices for the onsite monitoring of trace amounts of heavy metals.

Original languageEnglish
Pages (from-to)5619-5626
Number of pages8
JournalAnalytical Methods
Volume7
Issue number13
DOIs
Publication statusPublished - 7 Jul 2015
Externally publishedYes

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