BROWSE

Related Researcher

Author's Photo

Park, Noejung
Computational Physics & Electronic Structure Lab
Research Interests
  • Electronic structure calculation, computational physics, computational material science

ITEM VIEW & DOWNLOAD

Electron Emission Originated from Free-Electron-like States of Alkali-Doped Boron-Nitride Nanotubes

Cited 12 times inthomson ciCited 0 times inthomson ci
Title
Electron Emission Originated from Free-Electron-like States of Alkali-Doped Boron-Nitride Nanotubes
Author
Yan, BinghaiPark, ChangwonIhm, JisoonZhou, GangDuan, WenhuiPark, Noejung
Keywords
Alkali atoms; Applied fields; D orbitals; Electron dynamics; Electron emission properties; Electron emitters; Emission currents; Energy dispersions; Functional theories; Metallic states; Orders of magnitudes
Issue Date
2008-12
Publisher
AMER CHEMICAL SOC
Citation
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, v.130, no.50, pp.17012 - 17015
Abstract
We investigate the electronic structures and electron emission properties of alkali-doped boron-nitride nanotubes (BNNTs) using density-functional theory calculations. We find that the nearly free-electron (NFE) state of the BNNT couples with the alkali atom states, giving rise to metallic states near the Fermi level. Unlike the cases of potassium-doped carbon nanotubes, not only the s but the d orbital state substantially takes part in the hybridization, and the resulting metallic states preserve the free-electron-like energy dispersion. Through first-principles electron dynamic simulations under applied fields, it is shown that the alkali-doped BNNT can generate an emission current 2 orders of magnitude larger than the carbon nanotube. The nodeless wave function at the Fermi level, together with the lowered work function, constitutes the major advantage of the alkali-doped BNNT in electron emission. We propose that the alkali-doped BNNT should be an excellent electron emitter in terms of the large emission current as well as its chemical and mechanical stability.
URI
Go to Link
DOI
10.1021/ja805557g
ISSN
0002-7863
Appears in Collections:
PHY_Journal Papers
Files in This Item:
2-s2.0-58049209874.pdf Download

find_unist can give you direct access to the published full text of this article. (UNISTARs only)

Show full item record

qrcode

  • mendeley

    citeulike

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

MENU