[New progress of surface enhanced Raman spectroscopic studies on a gold electrode in a nonaqueous system].
Based on a highly sensitive new generation confocal microprobe Raman system, the adsorption behavior of thiocyanate (SCN-) on a gold electrode in methanol solution was investigated by SERS for the first time. Preliminary results demonstrated that the interaction between SCN- and the electrode is so strong that its SERS signal can be detected in the whole research potential region (-0.1 V(-)-1.4 V). The orientation change may occur in the potential range -0.6 V-0.7 V. From -0.1 V to -0.6 V SCN- is adsorbed mainly through S end onto Au surface while in the potential range of -0.7 V to -1.2 V it is oriented mainly through N end. The potential dependence of the Raman frequency of nu CN resulted in two different values of electrochemical Stark effect, suggesting the existence of molecular orientation change.
Gu
R
R
Department of Chemistry, Suzhou University, 215006 Suzhou.
Cao
W
W
Cao
P
P
Sun
Y
Y
Yao
J
J
Ren
B
B
Tian
Z
Z
D004563:Electrochemistry; D004566:Electrodes; D006046:Gold / Q000737:chemistry*; D000432:Methanol; D008968:Molecular Conformation; D012996:Solutions; D013059:Spectrum Analysis, Raman / Q000379:methods; D013861:Thiocyanates
D012996:Solutions; D013861:Thiocyanates; D006046:Gold; C031760:thiocyanate; D000432:Methanol