Application of Gold Nanoparticles to Spectrophotometric Sensing of Hydrophilic Anions Based on Molecular Recognition by Urea Derivative

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  • KADO Shinpei
    Department of Applied Chemistry, Faculty of Systems Engineering, Wakayama University
  • FURUI Ayumi
    Department of Applied Chemistry, Faculty of Systems Engineering, Wakayama University
  • AKIYAMA Yu
    Department of Applied Chemistry, Faculty of Systems Engineering, Wakayama University
  • NAKAHARA Yoshio
    Department of Applied Chemistry, Faculty of Systems Engineering, Wakayama University
  • KIMURA Keiichi
    Department of Applied Chemistry, Faculty of Systems Engineering, Wakayama University

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Description

We have prepared gold nanoparticles (GNPs) modified with a thiol compound that possesses a phenylurea moiety for the spectrophotometric sensing of hydrophilic anions, such as dihydrogen phosphate, based on changes in the surface plasmon absorption of the GNP. We examined the spectral change of phenylurea-modified GNP in dichloromethane upon the addition of various anions as tetrabutylammonium salts to the solution. The GNP showed increasing plasmon intensity with the concentration of dihydrogen phosphate. For a control experiment with an inactive hexanethiolate-modified GNP, such an ion-selective change in the plasmon band was not observed. Furthermore, in order to realize the spectrophotometric detection of hydrophilic anions in water using GNP with the urea functionality, we attempted to prepare bifunctional GNP modified with both the phenylurea derivative and a water-soluble thiol (e.g., L-cysteine). The resulting bifunctional GNP showed anion-selective changes in the plasmon band accompanied by increasing absorbance at a longer wavelength due to GNPs aggregation.

Journal

  • Analytical Sciences

    Analytical Sciences 25 (2), 261-265, 2009

    The Japan Society for Analytical Chemistry

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