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

Autor: Lebrón-Colón M, Meador MA, Solá F, Biaggi-Labiosa A, Fonseca LF, Resto O
Jazyk: angličtina
Rok vydání: 2009
Předmět:
Zdroj: Nanoscale Research Letters, Vol 4, Iss 5, Pp 431-436 (2009)
Druh dokumentu: article
ISSN: 1931-7573
1556-276X
DOI: 10.1007/s11671-009-9270-5
Popis: 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 factorS(k) and the reduced radial distribution functionG(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.
Databáze: Directory of Open Access Journals
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