非水体系中吡啶和乙腈在铂电极上竞争吸附的表面增强拉曼光谱研究  

Competitive Adsorption Studies of Pyridine and Acetonitrile on Platinum Electrodes in Non-aqueous System by Surface-enhanced Raman Spectroscopy

作　　者：顾仁敖[1] 丁邦东[2] 孙玉华[1] 曹佩根[1] 姚建林[3] 任斌[3] 田中群[3] 

机构地区：[1]苏州大学化学系,江苏苏州215006 [2]南通师范学院化学系,江苏南通226007 [3]厦门大学固体表面物理化学国家重点实验室,化学系,福建厦门361005

出　　处：《光谱学与光谱分析》2002年第6期967-969,共3页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金 (2 98730 33)资助项目

摘　　要：继非水体系中CO在过渡金属表面吸附的表面增强拉曼光谱 (SERS)研究之后 ,本文是又一篇关于非水体系中过渡金属表面SERS研究的文章。从拉曼谱峰的变化结果发现 ,吡啶在Pt电极表面是强烈的化学吸附 ,并且由于其吸附的量和吸附取向随电位在不断地变化 ,与水体系中吡啶 (Py)在Pt电极表面的吸附相比较 ,SERS谱峰除了强度较低之外 ,在可研究的电位区间、谱峰位置以及其随电位变化等方面都存在着不同 ,这缘于结构较为复杂的有机溶剂分子在电极表面组成了更为复杂的界面结构 ,造成固 液界面的电迁移等电极动力学过程发生了变化 ,为了说明这一现象 ,文中还采用强吸附离子I- 进行研究 ,得到相似的结果。In the non aqueous acetonitrile solution, recurring to the confocal Raman system, we studied the intensively chemical adsorption of pyridine (Py) on the surface of platinum electrode utilizing surface enhanced Raman scattering (SERS). With the change in the potential, the quantity and adsorptive orientation of the adsorbate also change,interacting on the surrounding molecules. In the present paper, the adsorption of Py on the surface of platinum electrode was not only clearly observed, but also the dissociation of acetonitrile was discovered simultaneously. And the more complicated double layer in the non aqueous solution than in the aqueous one explaines the differences of the results between the non aqueous and aqueous solutions.

关 键 词：吡啶 乙腈 铂电极 竞争吸附 表面增强 拉曼光谱 研究 

分 类 号：O646.5[理学—物理化学] O657.[理学—化学]