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

被引：26
作者：
Zhao, Jiang [1 ]
Zhang, Yaozhong [1 ]
Su, Yanjie [1 ]
Huang, Xiaolu [1 ]
Wei, Liangming [1 ]
Kong, Eric Siu-Wai [1 ]
Zhang, Yafei [1 ]
机构：
[1] Shanghai Jiao Tong Univ, Key Lab Thin Films & Microfabricat, Minist Educ, Res Inst Micro Nano Sci & Technol, Shanghai 200240, Peoples R China
来源：
DIAMOND AND RELATED MATERIALS | 2012年 / 25卷
基金：
上海市自然科学基金; 中国国家自然科学基金;
关键词：
Structural improvement; CVD carbon nanotubes; Rapid annealing; Structural analysis; RAMAN-SPECTROSCOPY; PURIFICATION; OXIDATION; BATTERIES;
D O I：
10.1016/j.diamond.2012.01.029
中图分类号：
T [工业技术];
学科分类号：
08 ;
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 degrees C and 2800 degrees C, while nanotubes with twisty shells and kinked walls have been observed as the annealing temperature approaches 3000 degrees 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. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码：24 / 28
页数：5
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