Halide-ion-assisted increase of surface-enhanced hyper-Raman scattering: a clear observation of the chemical effect

Authors

  • Almar Palonpon,

    Corresponding author
    1. Department of Applied Physics, Osaka University, Suita, Osaka 565-0871, Japan
    • Department of Applied Physics, Osaka University, Suita, Osaka 565-0871, Japan.
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  • Taro Ichimura,

    1. Department of Applied Physics, Osaka University, Suita, Osaka 565-0871, Japan
    2. CREST, Japan Corporation of Science and Technology, Kawaguchi, Saitama 322-0012, Japan
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  • Prabhat Verma,

    1. Department of Applied Physics, Osaka University, Suita, Osaka 565-0871, Japan
    2. CREST, Japan Corporation of Science and Technology, Kawaguchi, Saitama 322-0012, Japan
    3. Graduate School of Frontier Biosciences, Osaka University, Suita, Osaka 565-0871, Japan
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  • Yasushi Inouye,

    1. Department of Applied Physics, Osaka University, Suita, Osaka 565-0871, Japan
    2. CREST, Japan Corporation of Science and Technology, Kawaguchi, Saitama 322-0012, Japan
    3. Graduate School of Frontier Biosciences, Osaka University, Suita, Osaka 565-0871, Japan
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  • Satoshi Kawata

    1. Department of Applied Physics, Osaka University, Suita, Osaka 565-0871, Japan
    2. CREST, Japan Corporation of Science and Technology, Kawaguchi, Saitama 322-0012, Japan
    3. RIKEN, Wako, Saitama 351-0198, Japan
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Abstract

We show that the increase of surface-enhanced hyper-Raman scattering (SEHRS) intensity of organic dye molecules adsorbed on single silver (Ag) colloid aggregate in the presence of halide ions is a direct evidence of the chemical effect in the enhancement mechanism. Time-dependent SEHRS measurements before and after adding halide ions enabled us to distinctly observe the chemical effect. The presence of the halide ions results to a more stable chemical interaction between metal and dye molecule, making it more resistant against photodegradation effects. This study can contribute in elucidating the chemical effect mechanism and aid in the development of SEHRS as a useful spectroscopic tool. Copyright © 2008 John Wiley & Sons, Ltd.

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