Highly reproducible surface-enhanced Raman spectra on semiconductor SnO2 octahedral nanoparticles

Li Jiang; Penggang Yin; Tingting You; Hua Wang; Xiufeng Lang; Lin Guo; Shihe Yang

doi:10.1002/cphc.201200586

Highly reproducible surface-enhanced Raman spectra on semiconductor SnO2 octahedral nanoparticles

Chemphyschem. 2012 Dec 7;13(17):3932-6. doi: 10.1002/cphc.201200586. Epub 2012 Sep 20.

Authors

Li Jiang¹, Penggang Yin, Tingting You, Hua Wang, Xiufeng Lang, Lin Guo, Shihe Yang

Affiliation

¹ School of Chemistry and Environment, Beijing University of Aeronautics and Astronautics, Beijing, China.

PMID: 22997142
DOI: 10.1002/cphc.201200586

Abstract

Highly reproducible surface-enhanced Raman scattering (SERS) spectra are obtained on the surface of SnO(2) 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.