扫描隧道显微镜功能化针尖对分子能级的选择成像  

Selective analysis of molecular states by functionalized scanning tunneling microscope tips

作　　者：邓智滔[1] 高利[1] 林晓[1] 程志海[1] 贺晓波[1] 路军岭[1] 季威[1] 时东霞[1] 林海平 W.A.Hofer 高鸿钧[1] 

机构地区：[1]中国科学院物理研究所北京凝聚态物理国家实验室,北京100080 [2]Surface Science Research Centre,The University of Liverpool,LiverpoolL693BX,United Kingdom

出　　处：《物理》2006年第12期996-999,共4页Physics

基　　金：国家自然科学基金(批准号:90406022)资助项目

摘　　要：文章提出了一种通过修饰STM针尖使其功能化,调节扫描隧道显微镜(STM)的扫描偏压范围,实现对分子能级的选择性成像的方法.二萘嵌苯分子在Ag(110)表面上自组织形成的有序单层膜主要是通过分子的π电子态成像,而被二萘嵌苯分子修饰的STM针尖的能级失配于基底上吸附的分子的能级,从而只对分子的部分能级成像.这个结果为有机界面电子输运测量提供了一种更好的能级选择方法.Selective analysis of molecular states in scanning tunneling microscopy （STM） has so fro- been achieved in a few cases by tuning the bias range of the STM in high resolution measurements. Perylene adsorbed on Ag（110） is imaged mainly through the π - states of the molecule. By functionalizing the STM tip with a perylene molecule a mismatch is created between the energy levels of the STM tip and the molecule adsorbates, so that only metal states of the underlying silver surface are imaged. This method opens a route for better energy selectivity in electron transport measurements through organic interfaces.

关 键 词：分子能级的选择性表征 扫描隧道显微成像 功能化STM针尖 二萘嵌苯 

分 类 号：O561[理学—原子与分子物理]