High Temperature Treatment and Characterization of Carbon Nanotubes

Abstract

Abstract: Multi-walled carbon nanotubes(MWNTs) produced by the catalytic chemical vapor deposition(CCVD) method in a nano-agglomerated fluidized-bed reactor(NAFBR) have been treated in a vacuum furnace at the temperatures between 1 500 and 2 150 ℃. High resolution transmission electron microscopy(HRTEM), laser Raman spectroscopy, X-ray diffraction(XRD) and thermogravimetric analysis(TGA) were performed to characterize the annealed and purified MWNTs. The results reveal that the graphite layers of the tube-walls are more regular after the high temperature treatment, which can be characterized by Raman analysis. However, large defects in tube-walls can not be healed completely. Heating the nanotubes up to 1 800 ℃ essentially results in the removal of nanometer catalyst particles, and MWNTs with a purity of more than 99% can be obtained.

Key words: Carbon nanotubes, High temperature treatment, Crystallization, Purification

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WANG Yao, HUANG Wei, WEI Fei, LUO Guo-Hua, YU Hao, AIHEMAI Ti-Jiang . High Temperature Treatment and Characterization of Carbon Nanotubes[J]. Chem. J. Chinese Universities, 2003, 24(6): 953.

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High Temperature Treatment and Characterization of Carbon Nanotubes

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