Surface-enhanced Raman scattering: comparison of three different molecules on single-crystal nanocubes and nanospheres of silver.

Surface-enhanced Raman scattering: comparison of three different molecules on single-crystal nanocubes and nanospheres of silver.
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DOI:
10.1021/jp8101817
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发表时间:
2009-04-23
期刊:
The journal of physical chemistry. A
影响因子:
--
通讯作者:
Xia Y
Xia Y
中科院分区:
其他
文献类型:
--
作者:
Rycenga M;Kim MH;Camargo PH;Cobley C;Li ZY;Xia Y

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我们研究了三种不同分子的银单晶纳米立方和纳米球的表面增强拉曼散射(SERS),以定量地了解尖锐特征对SERS增强因子的影响。实验测量和理论计算都证实,由于纳米立方体表面的尖锐特征,它们具有更高的SERS活性。我们还发现测量到的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Ag纳米立方体的尖锐特征可以大大增加化学增强对SERS强度的贡献。
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.
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