Surface-enhanced Raman scattering in the ultraviolet spectral region: UV-SERS on rhodium and ruthenium electrodes.
We report the first observation of surface-enhanced Raman scattering (SERS) excited with ultraviolet (UV) light from transition metal electrodes. Adsorbed pyridine and SCN- on rough rhodium (Rh) and ruthenium (Ru) electrodes, respectively, have been studied using 325 nm laser excitation. In contrast, the best enhancers in the visible and near infrared, silver and gold, do not produce UV-SERS. The experimental data of UV-SERS are in agreement with our preliminary theoretical calculation based on the electromagnetic enhancement mechanism. The enhancement factor is about 2 orders of magnitude for the Rh and Ru electrodes when they are excited at 325 nm.
Ren
Bin
B
State Key Laboratory for Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen 361005, China.
Lin
Xu-Feng
XF
Yang
Zhi-Lin
ZL
Liu
Guo-Kun
GK
Aroca
Ricardo F
RF
Mao
Bing-Wei
BW
Tian
Zhong-Qun
ZQ
D004566:Electrodes; D011725:Pyridines / Q000737:chemistry; D012238:Rhodium / Q000737:chemistry*; D012428:Ruthenium / Q000737:chemistry*; D012542:Scattering, Radiation; D013059:Spectrum Analysis, Raman / Q000379:methods*; D013861:Thiocyanates / Q000737:chemistry; D014466:Ultraviolet Rays
D011725:Pyridines; D013861:Thiocyanates; D012428:Ruthenium; D012238:Rhodium; C023666:pyridine