表面增强喇曼散射(SERS)光谱中影响增强效应因素的实验研究(Ⅲ)

本文研究了苯甲酸水溶液的pH值,电极外加电位对银电极表面吸附苯甲酸SERS光谱表面增强效应的影响。实验结果表明,苯甲酸以—COO~-根负离子吸附于银电极表面。通过改变溶液的pH值,使苯甲酸吸附于粗糙银电极表面,溶液pH值影响电极表面吸附苯甲酸的面密度,电极外加电位影响—COO~-根离子与银电极间的电荷迁移,电极外加电位也影响苯甲酸在粗糙银电极表面的吸附。

Experimental study of factors affecting enhancement of SERS spectra (3)

The effects of pH and applied potential on the enhancement of Surface Enhanced Raman Scattering (SEES) spectra of benzoic acid molecules adsorbed on the silver electrode surface have been studied. Experiments showed that bensoic acid molecules were adsorbed on the electrochemically roughened silver electrode surface via group -COO-. By changing the pH of solution, it was possible for benzoic acid molecules to be adsorbed on the electrode. The pH of solution and the applied potential affected the density of adsorbed benzoic aoid molecules, and the applied potential affected the charge-transfer between group -COO- and silver electrode.