MRS Proceedings

Articles

Immobilization of CNT on Bamboo Charcoal by TEOS Vapor

2008 MRS Spring Meeting.

Jiangtao Zhua1, Fung Luen Kwonga1 and Dickon Hang Leung Nga1

a1 jtzhu@phy.cuhk.edu.hk, The Chinese University of Hong Kong, Department of Physics, Shatin, New Territories, Hong Kong, N/A, Hong Kong

a2 flkwong@phy.cuhk.edu.hk, The Chinese University of Hong Kong, Department of Physics, Shatin, New Territories, Hong Kong, N/A, China, People's Republic of

a3 dng@phy.cuhk.edu.hk, The Chinese University of Hong Kong, Department of Physics, Shatin, New Territories, Hong Kong, N/A, China, People's Republic of

ABSTRACT

Carbon nanotubes (CNTs) are successfully immobilized on a bamboo charcoal by chemical vapor deposition of gaseous tetraethyl orthosilicate (TEOS). Electron microscopies, Raman spectroscopy and electron energy loss spectroscopy are used to characterize the sample. The CNTs found on the bamboo charcoal support were several microns long, and their diameters ranged from 50nm to 300nm. From the high resolution transmission electron microscopic analysis, we found that the CNTs were composed of ∼30 layers of graphitic carbon sheets. Amorphous droplets were also found at the tips of the CNTs. This suggested that the growth of the CNT was via a vapor-liquid-solid mechanism. The amorphous droplets contained calcium, silicon and oxygen. The calcium impurity was originated from the bamboo while the silicon impurity was supplied by the TEOS. CNTs partially filled with calcium silicate were also found. It was evident that calcium silicate had played a critical role in the formation of these CNTs.

(Received March 14 2008)

(Accepted June 28 2008)

Key Words

  • nanostructure;
  • chemical vapor deposition (CVD) (chemical reaction);
  • transmission electron microscopy (TEM)
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