摘要
通过改变非对称方波电位阶跃的各个参数,控制0.1 mol·L^(-1)KBr及0.05 mol·L^(-1)γ-吡啶甲酸体系(pH=9.5)中银的氧化还原循环(ORC)过程的氧化过电位、还原过电位及氧化电量。用扫描电镜观察不同参数的ORC过程对银电极表面微观形态的影响,并研究了电极表面形态的变化对表面增强喇曼散射(SERS)效应的影响。实验结果表明,还原过电位和ORC过程中的氧化电量对电极表面形态及SERS效应有较明显的影响。另外,还用电结晶理论及表面局域场增强理论对实验结果进行了讨论。
The oxidation overpotential, reduction overpotential and the amount of oxida-
tion charge passed of silver in 0.1 tool·L^(-1) KBr+0.05 tool·L^(-1)Υ-pyridinecarboxylic
acid system(pH=9.5) during ORC (oxidation reduction cycle) is controlled via
changing the parameters of the step jump of the potential of unsymmetrical square
wave. The effect on surface morphology of silver electrode of ORC processes with di-
fferent parameters has been observed with SEM (scanning electron microscope).
The effect of variation of surface morphology of electrode on SERS(surface enhan-
ced Raman scattering) has also been investigated. The experimental results show
that the reduction overpotential and the amount of oxidation charge passed during
ORC have fairly strong effect on SERS intensities and on surface morphology of
electrode. A systematical SEM study of surface morphology during ORC with vario-
us parameters was done in title system. These results have been discussed in terms
of the theory of electrocrystallization and local enhancement of SERS.
出处
《复旦学报（自然科学版）》
CAS
CSCD
北大核心
1991年第3期281-286,共6页
Journal of Fudan University：Natural Science
关键词
银
吡啶甲酸
ORC
SEM
SERS
silver, pyridinecarboxylic acid, surface roughness
surface enhanced Raman scattering(SERS), scanning electron microscope(SEM).
