Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9697467 | Diamond and Related Materials | 2005 | 5 Pages |
Abstract
Vertically aligned carbon nanotube films with diameters smaller than 5 nm, high densities up to 1012/cm2, and lengths of â¼ 5-8 μm were deposited by microwave plasma-assisted chemical vapor deposition. Experiments show that, by continuous reduction in the thickness of the iron film (i.e., â¼0.3-0.5 nm), small diameter carbon nanotubes can be achieved with diameters that ranged from 1-5 nm, and the films are comprised of both single- and double-wall nanotubes. The electron field emission properties of the films were investigated by variable distance field emission and temperature-dependent field electron emission microscopy (T-FEEM). The films showed an emission site density of â¼104/cm2 and a threshold field of 2.8 V/μm similar to multiwalled nanotubes (1.9 V/μm). In addition, they also exhibited a temperature dependence of the emission site intensity.
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Electrical and Electronic Engineering
Authors
Y.Y. Wang, S. Gupta, J.M. Garguilo, Z.J. Liu, L.C. Qin, R.J. Nemanich,