Journal
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
Volume 7, Issue 2, Pages 712-716Publisher
AMER SCIENTIFIC PUBLISHERS
DOI: 10.1166/jnn.2007.116
Keywords
biosensors; biomimetics; diagnostics; nanoparticles; self-assembly
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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+.
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