Showing papers by "Bin Ren published in 2001"
TL;DR: In this paper, surface roughening procedures were attempted to obtain high-quality surface Raman spectra of pyridine on iron electrodes, and the results showed that proper surface roughness factor can not only increase the surface area, but also induce a weak SERS effect.
25 citations
TL;DR: In this paper, the surface enhanced Raman spectra (SERS) of adsorbed species from a bare cobalt (Co) bulk electrode were observed for the first time with confocal Raman microscopy.
Abstract: Surface enhanced Raman spectra (SERS) of adsorbed species from a bare cobalt (Co) bulk electrode were observed for the first time with confocal Raman microscopy. A combined AFM, Raman and electrochemical study shows that a proper roughening procedure is vitally important for obtaining good-quality surface Raman spectra from the Co electrode. The surface enhancement factor ranges from 2 to 3 orders of magnitude, depending critically on the surface roughening procedure. The present study provides a bright prospect for the wide investigation of systems of practical application.
16 citations
TL;DR: In this article, it was shown that a combination of electrochemical reactions and diffusion-convection (ERDC) mass transfer accounts for the potential oscillations that appear under conditions of transport limited current.
10 citations
TL;DR: The photoluminescence (PL) from silicon surfaces during photoelectrochemical etching processes was monitored in situ by using a confocal microprobe spectrometer.
Abstract: The photoluminescence (PL) from silicon surfaces during photoelectrochemical etching processes was monitored in situ by using a confocal microprobe spectrometer. The etching time, laser power, polarization potential and the resistance of silicon were found to remarkably influence the formation of porous silicon (PS). For the high resistance silicon sample, the PL band intially increases in intensity and blueshifts with the progress of etching, then decreases and stops shifting. The higher the laser power is, the stronger the PL intensity and the shorter the wavelength could be. For the low resistance silicon sample, no clear shift in the wavelength could be found with the progress of etching. These results were interpreted by the quantum confinement effect together with the influence of electrochemical reaction equilibrium and the surface oxidation species on the formation of PS.
2 citations
Journal Article•
TL;DR: 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, suggesting the existence of molecular orientation change.
Abstract: 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.
1 citations