Large Relative Raman Shift for Molecules Adsorbed on Metallic Nano-particles

LI Xiao-Yun; XIA Yu-Xing; ZHAN Li; LENG Jiang-Hua

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Large Relative Raman Shift for Molecules Adsorbed on Metallic Nano-particles

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The enhancement of two order-of-magnitudes is observed in surface-enhanced Raman spectroscopy (SERS) of gases (CO, C2H2, C2H4, etc) adsorbed on nitric acid-roughened metal foil. In addition, some Raman lines of gases adsorbed on these active substrates show larger frequency shifts and linewidth broadening, compared with the Raman spectroscopy of free gases. Using the two-oscillator electromagnetic model, we explain this phenomenon. It is related to the large non-regular particles on the active substrate we prepared. It is found that the parameters of the surface-plasmon dispersion, the distance of molecules from the surface and the radius of particles play crucial roles on the relative large Raman shifts.

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《中国物理快报：英文版》 |2008年第6期|2140-2143|共4页
作者
LI Xiao-Yun; XIA Yu-Xing; ZHAN Li; LENG Jiang-Hua;
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Spectroscopy Laboratory, Department of Physics, Shanghai Jiao Tong University, Shanghai 200240;

Spectroscopy Laboratory, Department of Physics, Shanghai Jiao Tong University, Shanghai 200240;

Spectroscopy Laboratory, Department of Physics, Shanghai Jiao Tong University, Shanghai 200240;

Spectroscopy Laboratory, Department of Physics, Shanghai Jiao Tong University, Shanghai 200240;

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中图分类物理学;
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Large Relative Raman Shift for Molecules Adsorbed on Metallic Nano-particles

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