Analyses of residual iron in carbon nanotubes produced by camphor/ferrocene pyrolysis and purified by high temperature annealing

被引：53
作者：
Antunes, E. F. [1 ,2 ]
de Resende, V. G. [1 ]
Mengui, U. A. [1 ]
Cunha, J. B. M. [3 ]
Corat, E. J. [1 ]
Massi, M. [1 ]
机构：
[1] Inst Nacl Pesquisas Espaciais, BR-12227010 Sao Jose Dos Campos, SP, Brazil
[2] Inst Tecnol Aeronaut, BR-12228900 Sao Jose Dos Campos, SP, Brazil
[3] Univ Fed Rio Grande do Sul, BR-91501970 Porto Alegre, RS, Brazil
来源：
APPLIED SURFACE SCIENCE | 2011年 / 257卷 / 18期
基金：
巴西圣保罗研究基金会;
关键词：
Carbon nanotubes; Purification; Annealing; Mossbauer spectrocopy; Camphor; XPS; RAMAN-SPECTRA; MOSSBAUER-SPECTROSCOPY; PURIFICATION; PRESSURE; CARBIDES; GROWTH; BAND;
D O I：
10.1016/j.apsusc.2011.04.090
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
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.
引用
收藏
页码：8038 / 8043
页数：6
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