School of Chemistry and Environment, Beijing University of Aeronautics and Astronautics, Beijing, China.
Chemphyschem. 2012 Dec 7;13(17):3932-6. doi: 10.1002/cphc.201200586. Epub 2012 Sep 20.
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.
在 SnO(2) 八面体纳米粒子的表面上获得了高度重现的表面增强拉曼散射 (SERS) 光谱。在 4-巯基苯甲酸 (4-MBA) 和 4-硝基苯硫醇 (4-NBT) 的主要拉曼峰强度的 SERS 信号中，点与点之间的 SERS 信号显示出一致低于 20 %的相对标准偏差 (RSD)，表明具有良好的空间均匀性和重现性。SERS 信号主要来源于电荷转移 (CT) 机制。使用时间依赖密度泛函理论 (TD-DFT) 来模拟 SERS 光谱，并解释实验中的化学增强机制。这项研究扩展了 SERS 的应用，并建立了一种新的均匀 SERS 基底。
