| Literature DB >> 17450820 |
Wenrong Yang1, J Justin Gooding, Zhicong He, Qiong Li, Guonan Chen.
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+.Entities:
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Year: 2007 PMID： 17450820
Source DB: PubMed Journal: J Nanosci Nanotechnol ISSN： 1533-4880