新型炭材料2008，Vol.23Issue(2)：104-110,7.
铬酸溶液后处理增强碳纳米管的场发射特性
Enhancement of field emission from carbon nanotubes by post-treatment with a chromium trioxide solution
摘要
Abstract
A simple method is described to functionalize the surface and to modify the structures of multi-walled carbon nanotubes (MWCNTs) grown on silicon substrates using chromium trioxide (CrO3) solution. Unlike nitric acid (HNO3) used in the conventional post-treatment for MWCNTs, the chemical reaction with CrO3 involves amorphous carbon and the carbon nanotubes themselves. It is expected that the surface morphology, chemical composition, and field emission of MWCNTs should be significantly changed after CrO3 solution treatment. The results showed that after 20 min of CrO3 solution treatment, the emission currents were enhanced compared with the as-grown MWCNTs. However, extended treatment over 20 min was found to degrade the field emission properties of the film. The enhancement in field emission after 20 min of CrO3 solution treatment can be ascribed to the modification of surface morphology, the increase in surface density of MWCNTs, and the lowering of the work function. Prolonged CrO3 treatment dissolves MWCNTs and thus results in a decrease in field emission.关键词
碳纳米管/场发射Key words
Carbon nanotube (CNTs)/Field emission分类
通用工业技术引用本文复制引用
李世鸿,张永平,李丽英..铬酸溶液后处理增强碳纳米管的场发射特性[J].新型炭材料,2008,23(2):104-110,7.
