Effects on Field Emission Properties of Carbon Nanotubes by Air Oxidation
Multiwall carbon nanotubes (CNTs) were prepared by the catalytic decomposition of acetylene at 600℃ using Ni as catalysts and the CNTs were treated by ball-milling for 0.5 -1 h. The treated CNTs were purified by removing most of amorphous carbon using air oxidation at the temperature of 300 -500℃. The morphologies and field emission properties of the oxidized CNTs were changed,mainly depending on the oxidation temperature. The field emission current density was increased , reached a maximum, and then decreased with increasing of the oxidation temperature. When the CNTs were oxidized at 400℃ for 10 min, the field emission current density reached to 126.5 μA/cm2 at the applied field of 4.41 V/μm. As a result, the most of amorphous carbon was removed and the purity of the CNTs was improved greatly. When the oxidized temperature is 400 -450℃, the purified CNTs showed excellent field emission properties, such as high emission current density and uniform luminescence spots distribution.
Carbon Nanotabe Ball Milling Oxidation Purification Field Emission
Zhejuan Zhang Zhuo Sun Yanping Zhang Tao Feng Yiwei Chen Pingsheng Quo Jiexin Yang
Engineering Research Center for Nanophotonics & Advanced Instrument,Ministry of Education, East Chin Shanghai Sunlights Technology Co., Ltd North Zhongshan Rd, 3663, Shanghai 200062, China
国际会议
上海
英文
1782-1787
2007-03-12（万方平台首次上网日期，不代表论文的发表时间）