Gold Nanoparticle-Based Sensing of "Spectroscopically Silent" Heavy Metal Ions

Youngjin Kim, Robert C. Johnson, Joseph T Hupp

Research output: Contribution to journalArticle

240 Citations (Scopus)

Abstract

A simple colorimetric technique for the detection of small concentrations of aqueous heavy metal ions, including toxic metals such as lead, cadmium, and mercury, is described. Functionalized gold nanoparticles are aggregated in solution in the presence of divalent metal ions by an ion-templated chelation process; this causes an easily measurable change in the absorption spectrum of the particles. The aggregation also enhances the hyper-Rayleigh scattering (HRS) response from the nanoparticle solutions, providing an inherently more sensitive method of detection. The chelation/aggregation process is reversible via addition of a strong metal ion chelator such as EDTA. Suggestions for improving the sensitivity and selectivity of the technique are given.

Original languageEnglish
JournalNano Letters
Volume1
Issue number4
Publication statusPublished - Apr 2001

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heavy metals
Heavy Metals
Heavy ions
Gold
Heavy metals
Metal ions
metal ions
heavy ions
chelation
gold
Chelation
Nanoparticles
nanoparticles
Agglomeration
Rayleigh scattering
Mercury (metal)
ethylenediaminetetraacetic acids
Poisons
Ethylenediaminetetraacetic acid
Chelating Agents

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Gold Nanoparticle-Based Sensing of "Spectroscopically Silent" Heavy Metal Ions. / Kim, Youngjin; Johnson, Robert C.; Hupp, Joseph T.

In: Nano Letters, Vol. 1, No. 4, 04.2001.

Research output: Contribution to journalArticle

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