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Highly Reproducible Surface-Enhanced Raman Spectra on Semiconductor SnO2 Octahedral Nanoparticles

Authors

  • Li Jiang,

    1. School of Chemistry and Environment, Beijing University of Aeronautics and Astronautics, Beijing, 100191 (China), Fax: (+86) 10-8233-8987
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  • Prof. Penggang Yin,

    Corresponding author
    1. School of Chemistry and Environment, Beijing University of Aeronautics and Astronautics, Beijing, 100191 (China), Fax: (+86) 10-8233-8987
    • School of Chemistry and Environment, Beijing University of Aeronautics and Astronautics, Beijing, 100191 (China), Fax: (+86) 10-8233-8987
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  • Tingting You,

    1. School of Chemistry and Environment, Beijing University of Aeronautics and Astronautics, Beijing, 100191 (China), Fax: (+86) 10-8233-8987
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  • Hua Wang,

    1. School of Chemistry and Environment, Beijing University of Aeronautics and Astronautics, Beijing, 100191 (China), Fax: (+86) 10-8233-8987
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  • Xiufeng Lang,

    1. School of Chemistry and Environment, Beijing University of Aeronautics and Astronautics, Beijing, 100191 (China), Fax: (+86) 10-8233-8987
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  • Prof. Lin Guo,

    Corresponding author
    1. School of Chemistry and Environment, Beijing University of Aeronautics and Astronautics, Beijing, 100191 (China), Fax: (+86) 10-8233-8987
    • School of Chemistry and Environment, Beijing University of Aeronautics and Astronautics, Beijing, 100191 (China), Fax: (+86) 10-8233-8987
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  • Prof. Shihe Yang

    Corresponding author
    1. School of Chemistry and Environment, Beijing University of Aeronautics and Astronautics, Beijing, 100191 (China), Fax: (+86) 10-8233-8987
    2. Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong (China)
    • School of Chemistry and Environment, Beijing University of Aeronautics and Astronautics, Beijing, 100191 (China), Fax: (+86) 10-8233-8987
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Abstract

Highly reproducible surface-enhanced Raman scattering (SERS) spectra are obtained on the surface of SnO2 octahedral nanoparticles. The spot-to-spot SERS signals show a relative standard deviation (RSD) consistently below 20 % in the intensity of the main Raman peaks of 4-mercaptobenzoic acid (4-MBA) and 4-nitrobenzenethiol (4-NBT), indicating good spatial uniformity and reproducibility. The SERS signals are believed to mainly originate from a charge-transfer (CT) mechanism. Time-dependent density functional theory (TD-DFT) is used to simulate the SERS spectrum and interpret the chemical enhancement mechanism in the experiment. The research extends the application of SERS and also establishes a new uniform SERS substrate.

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