表面增强拉曼散射：三种不同分子在银单晶纳米立方体和纳米球上的比较
Surface-enhanced Raman scattering: comparison of three different molecules on single-crystal nanocubes and nanospheres of silver.
作者信息
Rycenga Matthew, Kim Moon Ho, Camargo Pedro H C, Cobley Claire, Li Zhi-Yuan, Xia Younan
机构信息
Department of Biomedical Engineering, Washington University, St. Louis, Missouri 63130, USA.
出版信息
J Phys Chem A. 2009 Apr 23;113(16):3932-9. doi: 10.1021/jp8101817.
Abstract
We have investigated the surface-enhanced Raman scattering (SERS) of chemically prepared single-crystal nanocubes and nanospheres of Ag with three different molecules to quantitatively understand the effect of sharp features on the SERS enhancement factor. Both experimental measurements and theoretical calculations confirmed a higher SERS activity for the nanocubes as a result of sharp features on their surfaces. We also found major discrepancies between the measured SERS intensities and those predicted from the electromagnetic mechanism. Through analysis of SERS bands, we concluded that sharp features on the Ag nanocubes could greatly increase the contribution of the chemical enhancement to the SERS intensity.
摘要
我们用三种不同的分子研究了化学制备的银单晶纳米立方体和纳米球的表面增强拉曼散射（SERS），以定量了解尖锐特征对SERS增强因子的影响。实验测量和理论计算均证实，由于纳米立方体表面的尖锐特征，其具有更高的SERS活性。我们还发现测量的SERS强度与电磁机制预测的强度之间存在重大差异。通过对SERS谱带的分析，我们得出结论，银纳米立方体上的尖锐特征可以大大增加化学增强对SERS强度的贡献。
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