Unbound MEDLINE

Metal ion detection with oligo(ethylene glycol) monolayer-modified gold nanoparticles.

Abstract

Two colorimetric sensors of gold nanoparticles (AuNPs) modified with different oligo(ethylene glycol)-containing organic molecules have been developed to detect metal ions by ultraviolet-visible (UV-vis) extinction spectroscopy. These sensors display different responses to some metal ions. One exhibits high selectivity for Hg2+ over a variety of competitive metal ions and the other one can respond to a multitude of metal ions. These differences might result from the different functionalized end groups of the modified molecules. Coordination effect, pH response, and ionic strength were investigated to understand the mechanism of the responses to metal ions. The results suggested that the colorimetric responses were mainly induced by the coordination effect of the modified organic molecules and the removing of the modified organic molecules caused by metal ions.

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  • Publisher Full Text
  • Authors

    Li G, Yang B, Lu Z, Xia S, Feng H, Zhu X, Wang A, Zhu J

    Source

    Journal of nanoscience and nanotechnology 11:11 2011 Nov pg 9469-77

    MeSH

    Colorimetry
    Ethylene Glycols
    Gold
    Hydrogen-Ion Concentration
    Metal Nanoparticles
    Metals, Heavy
    Osmolar Concentration
    Spectrophotometry, Ultraviolet

    Pub Type(s)

    Journal Article
    Research Support, Non-U.S. Gov't

    Language

    eng

    PubMed ID

    22413231