纳米结构Pt膜方波电位法制备及特殊红外性能  

Nanostructured Films Prepared on Pt Microelectrode through Square Wave Oxidation reduction Cycles and Their Particular IR Properties

作　　者：陈友江[1] 孙世刚[1] 贡辉[1] 陈声培[1] 周志有[1] 李君涛[1] 

机构地区：[1]厦门大学固体表面物理化学国家重点实验室,化学系,厦门361005

出　　处：《物理化学学报》2004年第2期129-133,共5页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金(90206039;20021002);国家重点基础研究发展规划(2002CB211804)资助项目~~

摘　　要：运用方波电位法处理Pt微电极,制备一系列具有较高表面粗糙度的纳米结构薄膜.扫描隧道显微镜(STM)观察到薄膜由Pt金属岛组成,并测得所研制的薄膜虽然其平均厚度从58nm增加到139nm,但Pt金属岛的平均尺度仅从102nm增加到114nm,而岛的平均高度也只在15～18nm之间变化.以CO为探针分子,结合原位FTIR反射光谱研究,发现所制备的纳米结构薄膜上吸附态CO的红外吸收都给出类Fano光谱,初步归结为Pt金属岛的尺度效应.A series of nanostructured films exhibiting high surface roughness were prepared by using square wave oxidation reduction cycles (SWORC) on Pt microelectrodes.Scanning tunneling microscope (STM) studies illustrated that all the films were made up of Pt islands.Measurement showed that along with the increase of average thickness of nanostructured films from 58 to 139 nm,the average dimension of Pt islands in the film increased solely from 102 to 114 nm,and the average height of Pt islands varied from 15 to 18 nm.Employing CO adsorption as molecule probe reaction,IR properties of the prepared nanostructured Pt films of different roughness were investigated by using in situ FTIR spectroscopy.The results revealed that CO linearly adsorbed (COL) on all nanostructured Pt films prepared in this paper yielded Fano like spectra,i.e.,the IR absorption of COL on nanostructured Pt film gave rise to a bipolar IR band (asymmetric line shape),which may be attributed primarily to the size effect of Pt islands.

关 键 词：纳米结构薄膜 方波电位法 Pt微电极 红外性能 类Fano光谱 原位FTIR光谱 Pt金属岛 尺度效应 制备 

分 类 号：O646.5[理学—物理化学]