期刊
APPLIED SURFACE SCIENCE
卷 257, 期 18, 页码 8038-8043出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2011.04.090
关键词
Carbon nanotubes; Purification; Annealing; Mossbauer spectrocopy; Camphor; XPS
类别
资金
- FAPESP
A detailed analysis of iron-containing phases in multiwall carbon nanotube(MWCNT) powder was carried out. The MWCNTs were produced by camphor/ferrocene and purified by high temperature annealing in an oxygen-free atmosphere (N-2 or VC). Thermogravimetric analysis, Mossbauer spectroscopy, X-ray diffraction and X-ray photoelectron spectroscopy enabled the evaluation of the residual iron in MWCNTs after purification. The VC treatments provided MWCNTs with a purity degree higher than 99%. Moreover, Raman spectroscopy revealed a significant improvement in graphitic ordering after thermal annealing. A brief description of the mechanism of iron removal was included. We highlight the mobility of iron atoms through graphitic sheets and the large contact angle of iron clusters formed on MWCNT surfaces at high temperatures. (C) 2011 Elsevier B.V. All rights reserved.
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