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Highly Reproducible Surface‐Enhanced Raman Spectra on Semiconductor SnO2 Octahedral Nanoparticles |
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| Authors: | Li Jiang Prof Penggang Yin Tingting You Hua Wang Xiufeng Lang Prof Lin Guo Prof Shihe Yang |
| Institution: | 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) |
| 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. |
| Keywords: | density functional theory nanoparticles Raman spectroscopy semiconductors surface science |