Fast colorimetric detection of copper ions using L-cysteine functionalized gold nanoparticles |
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| Authors: | Yang Wenrong Gooding J Justin He Zhicong Li Qiong Chen Guonan |
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| Affiliation: | School of Chemistry, The University of New South Wales, Sydney, NSW 2052, Australia. |
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| Abstract: | 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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