Structural improvement of CVD multi-walled carbon nanotubes by a rapid annealing process

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• 作者：Jiang Zhao ; Yaozhong Zhang ; Yanjie Su ; Xiaolu Huang ; Liangming Wei ; Eric Siu-Wai Kong ; Yafei Zhang ; ^{yfzhang@sjtu.edu.cn}
• 关键词：Structural improvement ; CVD carbon nanotubes ; Rapid annealing ; Structural analysis
• 刊名：Diamond and Related Materials
• 出版年：2012
• 期刊代码：30_09259635
• 类别：ms
• 出版时间：May, 2012
• 卷：25
• 期：Complete
• 页码：24-28
• 文件大小：953 K

摘要

Generally, due to structural disorders in multi-walled carbon nanotubes (MWCNTs) synthesized by chemical vapor deposition (CVD), most of their properties are much below the expected values. A novel technique has been developed in this investigation for structural improvement of CVD MWCNTs using a rapid annealing process. Direct observation by transmission electron microscope (TEM) indicates obvious structural changes in the nanotubes after a rapid annealing process between 2000 掳C and 2800 掳C, while nanotubes with twisty shells and kinked walls have been observed as the annealing temperature approaches 3000 掳C. Decrease of I_D/I_G ratio in Raman spectra, increase of the starting oxidation temperature observed in Thermogravimetric analysis (TGA), as well as increase in electrical conductivity of nanotube powders suggests the reconstruction toward more ordered nanotube structure after a rapid high temperature annealing process.