Au@Pt纳米粒子单层膜对甲醇氧化的电催化性能及SERS研究  

Electrocatalysis on Oxidation of Methanol and SERS Investigations of Au@Pt Monolayer Film

作　　者：张彩萍[1] 郭清华[1] 徐敏敏[1] 袁亚仙[1] 姚建林[1] 顾仁敖[1] 

机构地区：[1]苏州大学材料与化学化工学部,苏州215123

出　　处：《化学学报》2012年第12期1327-1331,共5页Acta Chimica Sinica

基　　金：国家自然科学基金(Nos.21073128;21033007;20973120)资助项目~~

摘　　要：通过种子生长法合成Au@Pt核壳结构纳米粒子,采用两相成膜法制备单层粒子膜,并转移获得Au@Pt核壳纳米粒子单层膜电极,该电极表面纳米粒子分布均匀,具有较大的比表面,对甲醇的氧化具有较好的电催化活性.研究表明,利用内核Au的长程电磁场增强效应,该单层膜表现出均匀且优良的表面增强拉曼散射(SERS)活性,适合作为基底在分子水平上研究表面的吸附和反应.获得了Au@Pt核壳纳米粒子单层膜表面甲醇电催化氧化过程的SERS光谱,为深入分析表面反应机理提供了实验依据.Au@Pt core-shell nanoparticles were successfully synthesized via the seed-mediate growth method and were self-assembled to be a monolayer film at the water/hexane interface. After being carefully transferred onto a glassy carbon （GC） electrode, a monolayer film electrode was fabricated with high Au@Pt surface-to-volume ratio. It was found that good dispersion of Au@Pt core-shell nanoparticles on the surface of GC electrode was achieved, resulting in the uniform monolayer film electrode. It was resulted that the as-prepared monolayer film electrode exhibited high electrocatalytic activity for methanol oxidation. More- over, the monolayer film exhibited excellent surface enhanced Raman spectroscopic （SERS） activity due to the long-range enhancement effect from the Au nanoparticles core, which was well recognized as a good SERS substrate. Therefore, it can be served as a SERS substrate for investigating the surface adsorption and reactions at the molecular level. According to these advantages of the monolayer film electrode, the reaction process of methanol oxidation was monitored by in situ SERS detection via combining the strong SERS ac- tivity and the high electrocatalytic activity of the monolayer film electrode. The data supplies the basis on analyzing the mechanism of methanol oxidation on Au@Pt film/GC electrode.

关 键 词：Au@Pt 单层膜电极 表面增强拉曼光谱 电催化 甲醇 

分 类 号：TB383.1[一般工业技术—材料科学与工程]