摘要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.
Abstract：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.
[1] Zhou Z H et al %, Xu J, Cheng Y, Xu Z Z, Sugiokai K and Midorikawai K2008 Jpn. J. Appl. Phys. 47 189 [2 Felicia T et al %, Monica B, Lucian B and Simion A2007 Nanotechnology 18 1 [3] Yang Y et al %, Xiong L M, Shi J L and Nogami M2006 Nanotechnology 172670 [4] Dilella D P and Gohin A 1980 J. Chem. Phys. 73 4282 [5] Manzel K, Schulze W and Moskovits M 1982 Chem. Phys.Lett. 85183 [6] Williams C T 1996 Journal of Catalysis 163 63 [7] Akemann W and Otto A 1995 Langmuir 11 1196 [8] Xue G, Dong J and Zhang M S 1991 Appl. Spectrosc. 45 756 [9] Arya K and Zeyher R 1981 Phys. Rev. B 24 1852 [10] Adrian F J 1982 J. Chem. Phys. 77 5302 [11] Frederick W K, Richard P V D and George C S 1978 J. Chem.Phys. 69 4472 [12] Willis R F, Lucas A A and Mahan G D 1983 Adsorption at SolidSurfaces in the Chemical Physics of Solid Surfaces and HeterogeneousCatalysis (Amsterdam: Elsevier) vol 2 p 58 [13]Agarwal G S and Sudhanshu S J 1982 Phys. Rev. B 26 4013 [14] Agarwal G S, Sudhanshu S J and ONeil S V 1987 Phys. Rev.B 35 6122 [15] Agarwal G S and ONeil S V 1983 Phys. Rev. B 28 487 [16] Ruppin R 1975 Phys. Rev. B 11 2871 [17] Moskovits M 1985 Rev. Mod. Phys. 57 783
2008, Vol. 25 
