Carbon-alloying of the rear surfaces of nanotubes by direct fluorination

被引:38
作者
Hattori, Y
Watanabe, Y
Kawasaki, S
Okino, F
Pradhan, BK
Kyotani, T
Tomita, A
Touhara, H [1 ]
机构
[1] Shinshu Univ, Fac Text Sci & Technol, Dept Chem, Ueda, Nagano 3868567, Japan
[2] Tohoku Univ, Inst Chem React Sci, Sendai, Miyagi 9808577, Japan
基金
日本学术振兴会;
关键词
carbon nanotubes; chemical vapor deposition; fluorination; X-ray photoelectron spectroscopy (XPS); transmission electron microscopy (TEM);
D O I
10.1016/S0008-6223(98)00296-6
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
Carbon nanotubes prepared by pyrolytic carbon deposition onto anodic aluminum oxide films were fluorinated in the temperature range from 50 to 200 degrees C. X-ray photoelectron spectroscopy (XPS) was used to investigate changes in the chemical nature of their surface. Fluorine atoms are covalently bonded to carbon atoms on the internal surfaces (rear surfaces) of the tubes. The amount of fluorine attached on the tubes increases with increasing reaction temperature. The Raman spectra show a pair of bands at 1340 and 1590 cm(-1) peculiar to disordered sp(2)-carbons. The transmission electron microscope (TEM) bright-field images of the products were similar to those of pristine tubes. These results indicate that C-F bonds are formed on the rear surfaces of the tubes, viz. carbon-alloying via fluorination, while the external surfaces as well as the layers between the internal and external surfaces retain their sp(2)-hybridization. (C) 1999 Elsevier Science Ltd All rights reserved.
引用
收藏
页码:1033 / 1038
页数:6
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