TITLE

Enhanced field emission from carbon nanotubes by hydrogen plasma treatment

AUTHOR(S)
Zhi, C. Y.; Bai, X. D.; Wang, E. G.
PUB. DATE
August 2002
SOURCE
Applied Physics Letters;8/26/2002, Vol. 81 Issue 9, p1690
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The field emission capability of the carbon nanotubes (CNTs) has been improved by hydrogen plasma treatment, and the enhanced emission mechanism has been studied systematically using Fourier-transform infrared spectroscopy, Raman, and transmission electron microscopy. The hydrogen concentration in the samples increases with increasing plasma treatment duration. A C[sup δ-] - H[sup δ+] dipole layer may form on CNTs' surface and a high density of defects results from the plasma treatment, which is likely to make the external surface of CNTs more active to emit electrons after treatment. In addition, the sharp edge of CNTs' top, after removal of the catalyst particles, may increase the local electronic field more effectively. The present study suggests that hydrogen plasma treatment is a useful method for improving the field electron emission property of CNTs.
ACCESSION #
7202847

 

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