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