拉曼散射
材料科学
基质(水族馆)
半导体
时域有限差分法
分子
吸附
拉曼光谱
密度泛函理论
化学物理
散射
吸收(声学)
谱线
联轴节(管道)
纳米技术
光电子学
化学
光学
物理化学
计算化学
有机化学
物理
地质学
复合材料
海洋学
冶金
天文
作者
Li Jun Jiang,Tingting You,Penggang Yin,Yang Shang,Dongfeng Zhang,Lin Guo,Shihe Yang
出处
期刊:Nanoscale
[The Royal Society of Chemistry]
日期:2013-03-14
卷期号:5 (7): 2784-2784
被引量:141
摘要
Surface-enhanced Raman scattering (SERS) spectra of 4-mercaptobenzoic acid (4-MBA) have been investigated on the surface of Cu2O nanospheres. The SERS signals were believed to originate from the static chemical enhancement, resonant chemical enhancement and electromagnetic enhancement. The coupling between the adsorbates and the semiconductor, evidenced by the shift in absorption spectrum of modified Cu2O and the enhancement of non-totally symmetric modes of the 4-MBA and 4-mercaptopyridine (4-MPY) molecules, were invoked to explain the experimental results. Furthermore, simulations were employed to investigate the nature of the enhancement mechanisms operative between the molecules and the semiconductor. Density functional theory (DFT) calculations suggested a charge transfer (CT) transition process between the molecules and the Cu2O nanospheres. Three-dimensional finite-difference time domain (3D-FDTD) simulations were conducted to map out the electromagnetic field around the Cu2O nanospheres. The experimental and simulation results have revealed the promise of the Cu2O nanospheres as a good SERS substrate and the prospect of using the SERS substrate as a valuable tool for in situ investigation and assay of the adsorption behavior on semiconductor surfaces.
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