STM碳纳米管针尖的研究

Study on carbon nanotube tips for scanning tunneling microscope

合成和提纯了单壁碳纳米管 (SWCNTs)。使用水溶胶体 ,SWCNTs被组装在钨 (W)针尖上 ,它可以用作扫描隧道显微镜 (STM)的针尖 ,得到高定向石墨 (HOPG)和金 (Au)膜表面的原子分辨像。用场发射显微镜 (FEM)研究了SWCNTs的场发射特性 ,得到了原子分辨的场发射图 ,与计算的 ( 9,9)扶手椅型的SWCNT结构相一致。研究了SWCNTs的电学特性 。

Single wall carbon nanotubes (SWCNTs) have been synthesized and purified. Using a water colloid, SWCNTs have been assembled at the end of a tungsten tip that can be used as a scanning tunneling microscope (STM) tip, and atomic resolution images of HOPG and gold film surfaces have been obtained. The field emission properties of SWCNTs have also been studied by field emission microscopy (FEM). A field emission pattern of an SWCNT at atomic resolution was observed, which is consistent with the calculated results of a (9,9) armchair SWCNT. Electron transport properties along SWCNTs were investigated, negative differential conductance was observed.