异烟酸在碱性溶液中金电极上的现场表面增强振动光谱研究  

In situ Surface-Enhanced Vibrational Spectroscopies on Isonicotinic Acid Adsorbed on Gold Electrodes in Alkaline Solutions

作　　者：薛晓康[1] 霍胜娟[1] 严彦刚[1] 王金意[1] 姚建林[2] 蔡文斌[1] 

机构地区：[1]复旦大学化学系上海市分子催化和功能材料重点实验室,上海200433 [2]苏州大学化学化工学院,苏州215006

出　　处：《化学学报》2007年第15期1437-1442,共6页Acta Chimica Sinica

基　　金：国家自然科学基金(No.20473025);新世纪优秀人才计划(No.040349);高等学校博士点专项科研基金(No.20040246008);厦门大学固体表面物理化学国家重点实验室开放课题(No.2003003)资助项目.

摘　　要：应用表面增强红外吸收光谱法、循环伏安法和微分电容法研究了0.1mol·L-1KClO4和0.1mol·L-1KCl碱性化溶液(pH10)中,异烟酸(INA)在Au电极表面的吸附取向和结构.结果表明:-0.5～0.2V(vs.SCE)间INA阴离子(INA-)通过其羧酸根上的两个氧原子垂直吸附在Au电极表面;特性吸附Cl-对上述吸附结构无实质影响.进一步的表面增强拉曼光谱的测试表明即使在-0.8～-0.5V,极少量吸附的INA-很可能仍维持上述基本构型.Surface-enhanced infrared absorption spectroscopy （SEIRAS） in conjunction with cyclic voltammetry and differential capacitance measurement has been applied to investigate the adsorption configuration of isonicotinate （INA-） species on Au electrodes in alkalinized 0.1 mol·L^-1 KC104 and 0.1 mol·L^-1 KCl solutions （pH 10）. The results indicate that INA^- is nearly vertically adsorbed on the Au surface through the two oxygen atoms of its carboxylate group between -0.5 and 0.2 V （vs. SCE）. The presence of Cl^- in a supporting electrolyte dose not change the adsorption configuration of INA- on Au electrodes. Further supporting information from surface-enhanced Raman spectroscopy suggests that at negative potentials from -0.8 to -0.5 V, INA^- species adsorbed on Au electrode of a very low coverage is likely to remain the nearly same configuration as that revealed at more positive potentials.

关 键 词：表面增强红外吸收光谱 异烟酸 AU电极 吸附构型 表面增强拉曼光谱 

分 类 号：O646.54[理学—物理化学]