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Fast colorimetric detection of copper ions using L-cysteine functionalized gold nanoparticles

Fast colorimetric detection of copper ions using L-cysteine functionalized gold nanoparticles

Journal of Nanoscience and Nanotechnology 7(2): 712-716

This communication reports an efficient visual detection method of Cu2+ by L-cysteine functionalized gold nanoparticles in aqueous solution. Upon exposure to Cu2+, the gold nanoparticle solution changed from red to blue, in response to surface plasmon absorption of dispersed and aggregated nanoparticles. This colorimetric sensor allows a rapid quantitative assay of Cu2+ down to the concentration range of 10(-5) M. Recognition of Cu2+ and formation of the aggregates are proposed to occur via a 2 : 1 sandwich complex between L-cysteine and Cu2+.

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Accession: 053210210

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PMID: 17450820

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