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Field Emission and Radial Distribution Function Studies of Fractal-like Amorphous Carbon Nanotips

Solá, F. and Biaggi-Labiosa, A. and Fonseca, L. F. and Resto, O. and Lebrón-Colón, M. and Meador, M. A. (2009) Field Emission and Radial Distribution Function Studies of Fractal-like Amorphous Carbon Nanotips. Nanoscale Research Letters, 4 (5). pp. 431-436.

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Official URL: http://www.springerlink.com/content/d4rl1804372650...

Abstract

The short-range order of individual fractal-like amorphous carbon nanotips was investigated by means of energy-filtered electron diffraction in a transmission electron microscope (TEM). The nanostructures were grown in porous silicon substrates in situ within the TEM by the electron beam-induced deposition method. The structure factor S(k) and the reduced radial distribution function G(r) were calculated. From these calculations a bond angle of 124° was obtained which suggests a distorted graphitic structure. Field emission was obtained from individual nanostructures using two micromanipulators with sub-nanometer positioning resolution. A theoretical three-stage model that accounts for the geometry of the nanostructures provides a value for the field enhancement factor close to the one obtained experimentally from the Fowler-Nordheim law.

Item Type:Article
Uncontrolled Keywords:Carbon nanotips - Graphite-like a-C - EELS - EFED - Field emission
Subjects:Analytical Science > Microscopy and probe methods
Analytical Science > Beam methods
ID Code:4323
Deposited By:Lesley Tobin
Deposited On:10 Jun 2009 14:08
Last Modified:10 Jun 2009 14:08

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