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中文摘要：
对催化化学气相沉积法制备的无序多壁碳纳米管（MWNTs）进行了温度从1362-2100℃的系统研究。MWNTs退火前后能谱分析显示：1600℃退火的MWNTs组成变化最大，1800℃退火的基本可以消除夹杂在MWNTs中的催化剂杂质，透射电镜（TEM）和拉曼光谱（Raman）研究表明，高温退火除去碳杂质的同时，还可在一定程度上修复MWNTs管壁上的结构缺陷，提高其石墨化度。随着退火温度的升高，MWNTs的微观结构经历了由平滑到粗糙，进而有无规石墨圈生成的变化过程。
英文摘要：
Systematic studies of purity and structural changes disorder carbon nanotubes, which were produced by a catalytic chemical vapor deposition method, with heat treatment from 1362 ℃ to 2100 ℃ were carried out. Energy dispersive spectrometry （EDS） spectra of MWNTs specimens before and after annealed showed that the greatest change of compositions of the specimens was observed after annealing at 1600 ℃ and impurities were efficiently removed at 1800 ℃. Transmission electron microscopy （TEM） and Raman spectroscopy （Raman） analysis shows that impurities have been efficiently removed and some defects have been healed and graphitization of annealed MWNTs is high. With increasing heat treatment temperature, the structure of the carbon nanotubes changes from a relatively smooth surface to a rugged surface and forms energetically stable loops between adjacent active end planes both on the inner and outer surfaces.
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