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Issue 18, 2014
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Electrochemical synthesis of a gold atomic cluster–chitosan nanocomposite film modified gold electrode for ultra-trace determination of mercury

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Abstract

Gold atomic cluster based nanocomposites are important in the field of energy and sensing applications due to their interesting optical, electronic, chemical and catalytic properties. In the present study a chitosan stabilized gold atomic cluster nanocomposite was synthesised by a simple electrochemical technique based on the anodic dissolution of a gold electrode in the presence of a cationic surfactant, cetyl trimethyl ammonium bromide (CTAB), and a biopolymer, chitosan, on a gold electrode. The gold clusters formed were characterized by DLS, TEM, MALDI-TOF-MS, XPS, fluorescence and cyclic voltammetry. The developed gold atomic cluster–chitosan (AuAC–Chit) nanocomposite modified gold electrode was highly sensitive and selective for the electrochemical detection of Hg(II) ions. It offers a wider calibration range of 10−14–10−7 M with a limit of detection (LOD) of 0.8 × 10−14 M and a limit of quantification (LOQ) of 6.6 × 10−14 M, much below the guideline value of 1 × 10−8 M stipulated by United States Environmental Protection Agency (USEPA), accompanied by a good precision of 1.06% for 10−13 M of Hg(II). The designed sensor is selective to Hg(II) ions in the presence of other coexisting species.

Graphical abstract: Electrochemical synthesis of a gold atomic cluster–chitosan nanocomposite film modified gold electrode for ultra-trace determination of mercury

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Supplementary files

Article information


Submitted
07 Jan 2014
Accepted
11 Mar 2014
First published
26 Mar 2014

Phys. Chem. Chem. Phys., 2014,16, 8529-8535
Article type
Paper

Electrochemical synthesis of a gold atomic cluster–chitosan nanocomposite film modified gold electrode for ultra-trace determination of mercury

P. K. Aneesh, S. R. Nambiar, T. P. Rao and A. Ajayaghosh, Phys. Chem. Chem. Phys., 2014, 16, 8529
DOI: 10.1039/C4CP00063C

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