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자연과학대학
물리학전공
Journal papers
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Field emission of metal nanowires studied by first-principles methods
Title
Field emission of metal nanowires studied by first-principles methods
Authors
Lee C.-K.
;
Lee B.
;
Ihm J.
;
Han S.
Ewha Authors
한승우
SCOPUS Author ID
한승우
Issue Date
2007
Journal Title
Nanotechnology
ISSN
0957-4484
Citation
Nanotechnology vol. 18, no. 47
Indexed
SCI; SCIE; SCOPUS
Document Type
Article
Abstract
We study the field-emission properties of an ultrathin silver nanowire using first-principles methods. The simulation and analysis of the field emission are carried out based on density-functional theory using a localized basis scheme. Through the explicit time evolution of wavefunctions, we obtain the emission currents and spatial distributions of emitted electrons from a silver nanowire. In contrast to carbon nanotubes, the localized states are not found. Instead, pronounced emission currents are observed for s-like extended states that are free of nodes in a plane normal to the field direction, and the total emission currents of a silver nanowire are found to be significantly larger than those of carbon nanotubes. A quantum-mechanical analysis is presented to explain the observed current enhancement. On the other hand, an ultrathin gold nanowire gives much smaller emission currents than the silver nanowire due to a larger work function. © IOP Publishing Ltd.
DOI
10.1088/0957-4484/18/47/475706
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