Nano Archive

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

Yang, Wenrong and Gooding, J. Justin and He, Zhicong and Li, Qiong and Chen, Guonan (2007) Fast colorimetric detection of copper ions using L-cysteine functionalized gold nanoparticles. JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, 7 (2). pp. 712-716.

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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+.

Item Type:Article
Uncontrolled Keywords:biosensors; biomimetics; diagnostics; nanoparticles; self-assembly
Subjects:Analytical Science > Nanotechnology for sensing and actuating
Physical Science > Nano objects
Material Science > Nanochemistry
ID Code:2650
Deposited By:Anuj Seth
Deposited On:09 Jan 2009 12:00
Last Modified:20 Jan 2009 11:07

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