Development of an anion probe: Detection of sulfate ion by two-photon fluorescence of gold nanoparticles

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    Abstract

    Anion-selective detection is demonstrated for sulfate ion in aqueous solutions by using two-photon excited fluorescence of gold nanoparticles (AuNPs) modified with a thiourea-based anion receptor, bis[2-(3-(4-nitrophenyl)thioureido)ethyl]-disulfide. The fluorescent intensity increased with the change of the sulfate concentration in the solution from 10 -4 to 10 -3 M. In comparison with an unadsorbed receptor molecule in bulk acetonitrile solution, the molecule on AuNPs in water showed improved affinity for sulfate ion. The controllability of the hydrophobicity around receptor molecules on AuNPs is considered a dominant contributing factor for improved sulfate affinity. This unique feature of the surface enables us to detect anionic species in an aqueous phase where a dye-type indicator has poor sensitivity.

    Original languageEnglish
    Pages (from-to)1139-1144
    Number of pages6
    Journalanalytical sciences
    Volume28
    Issue number12
    DOIs
    Publication statusPublished - 2012

    All Science Journal Classification (ASJC) codes

    • Analytical Chemistry

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