离子液体存在下银的电沉积及其表面增强拉曼散射活性研究

离子液体作为一种绿色介质，在电化学领域的应用研究正在兴起，并已引起了研究者的浓厚兴趣。运用循环伏安法研究了离子液体(1-丁基-3-甲基咪唑硝酸盐，bmim]NO₃)添加剂存在时，AgNO₃溶液中的Ag在玻碳电极上的电化学沉积行为。研究表明，离子液体的加入对Ag的沉积具有阻化作用。采用扫描电镜(SEM)对沉积层的表面形貌进行表征，结果显示离子液体的存在可使沉积层更加致密，Ag颗粒的尺寸减小。以甲基橙为探针分子，研究了在加入及不加bmim]NO₃添加剂的AgNO₃溶液中电沉积所得银颗粒膜的表面增强拉曼散射(SERS)效应，增强因子分别为1.7×105和1.1×105，表明在离子液体存在下制得的Ag颗粒膜具有相对较好的SERS活性。

Electrochemical Deposition of Silver by Using Ionic Liquids as Additive and Its Surface-Enhanced Raman Scattering Effect

In the present work,the electrochemical deposition of silver was investigated on a glassy carbon electrode from AgNO3 solutions in the presence of RTILs (1-butyl-3-methyl imidazolium nitrate,bmim]NO3) additive by cyclic voltammetric technique,scanning electron microscope (SEM) and X-ray photon spectroscopy (XPS). For comparison,the electrodeposition of silver from bmim]NO3-free AgNO3 solution was also investigated. The voltammograms showed that the cathodic peak potential shifted toward more negative pote...