title: Field Emission and Radial Distribution Function Studies of Fractal-like Amorphous Carbon Nanotips.
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 degrees 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.
authors.forename: F
authors.initials: F
authors.lastname: Solá
authors.forename: A
authors.initials: A
authors.lastname: Biaggi-Labiosa
authors.forename: L F
authors.initials: LF
authors.lastname: Fonseca
authors.forename: O
authors.initials: O
authors.lastname: Resto
authors.forename: M
authors.initials: M
authors.lastname: Lebrón-Colón
authors.forename: M A
authors.initials: MA
authors.lastname: Meador