异烟酸在Au电极上的紫外表面增强拉曼散射研究  

Ultraviolet surface-enhanced Raman scattering studies of isonicotinic acid at Au electrode

作　　者：张星[1] 郝艳玲[1] 

机构地区：[1]兴义民族师范学院物理系,贵州兴义562400

出　　处：《西北师范大学学报（自然科学版）》2013年第4期57-60,共4页Journal of Northwest Normal University(Natural Science)

基　　金：贵州省教育厅自然科学研究基金资助项目(20090099);黔西南州科技局科技计划项目(2012-2);兴义民族师范学院科研基金资助项目(11xyyz04)

摘　　要：采用紫外光(λ=325nm)激发,测得了异烟酸分子吸附在粗糙Au电极表面的表面增强拉曼散射(SERS)光谱,并研究了随电极电位变化的SERS谱.根据SERS选择定则,分析认为异烟酸主要通过羧基竖直吸附在Au电极表面,而且随着电极电位的变化,其吸附方式基本不变.由于紫外光不能引起贵金属表面的等离子体共振,而且随着电极电位的负移,异烟酸各组拉曼峰有3～7cm-1移动,分析认为异烟酸在Au电极表面的SERS增强机制以电荷转移机制为主.With ultraviolet （UV,A = 325 nm） excitation, the surface enhanced Raman scattering （SERS） spectrum of isonicotinic acid adsorbed on the roughened Au electrode is recorded. In addition, the potential-dependent Raman spectra are also studied. According to the SERS selection rules, we deduce that the isonicotinic acid stand perpendicularly on gold surface via carboxylate group and with the varying of potential the adsorbed behavior of isonicotinic acid is invariant. Since the surface plasmon can not excite in the ultraviolet region on Au and the vibration frequencies of isonicotinic acid on the Au electrode are shifted 3-7 cm-1 with the negative shift of the electrode potential, so the charge transfer（CT） mechanism can probably explain the exDeriment results in the present wark.

关 键 词：表面增强拉曼散射(SERS) 吸附行为 异烟酸 AU电极 

分 类 号：O657.37[理学—分析化学]