Purification of Carbon Nanotubes Synthesized by Pyrolysis Flame
Pyramid shaped pyrolysis flame is a new method for carbon nanotubes (CNTs) synthesis, using this method has successfully produced high properties carbon nanotubes. But, because at the first Imin of sampling time, there are not tubes produced, so catalyst particles and carbon atom clusters assemble on the sampling substrate in the first lmin. Also, lots of amorphous carbon, deformity tubes, and graphite segment were produced in the experimental. In order to eliminate these impurities, ultrasonic treatment, aether cleaning, acid pickling, and co-processing were used. Ultrasonic treatment can separate particles from tubes, aether can clear amorphous carbon and graphite segment while acid pickling can dissolve catalyst particles. Using ultrasonic oscillation separation and aether as diluent can gain pure sample. Ultrasonic oscillation and nitric acid as diluent can purify products also, but not as good as aether as diluent. Concentrated nitric acid and long time immersion will destroy the structure of carbon nanotubes.
DING Zhao-yong SUN Bao-min Bl Jin-sheng DING Xiao-lian
School of Energy, Power and Mechanical Engineering, North China Electric Power University, China School of Electrical and Electronic Engineering, North China Electric Power University, China
国际会议
长沙
英文
493-496
2011-06-30（万方平台首次上网日期，不代表论文的发表时间）