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Fast colorimetric detection of copper ions using L-Cysteine functionalized gold nanoparticles
journal contributionposted on 2007-02-01, 00:00 authored by Wenrong YangWenrong Yang, J Gooding, Z He, Q Li, G Chen
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+.
JournalJournal of nanoscience and nanotechnology
Pagination712 - 716
PublisherAmerican Scientific Publishers
LocationStevenson Ranch, Calif.
Publication classificationC1.1 Refereed article in a scholarly journal
Copyright notice2007, American Scientific Publishers
Science & TechnologyPhysical SciencesTechnologyChemistry, MultidisciplinaryNanoscience & NanotechnologyMaterials Science, MultidisciplinaryPhysics, AppliedPhysics, Condensed MatterChemistryScience & Technology - Other TopicsMaterials SciencePhysicsbiosensorsbiomimeticsdiagnosticsnanoparticlesself-assemblyPLASMON RESONANCE SENSORSHEAVY-METAL IONSAMINO-ACIDSRECOGNITIONSTABILITY