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

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 ne...

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Published in:Journal of the American Chemical Society Vol. 130; no. 50; pp. 17012 - 17016
Main Authors: Binghai Yan, Changwon Park, Ihm, Jisoon, Gang Zhou, Wenhui Duan, Noejung Park
Format: Article
Published: American Chemical Society 12/17/2008
Subjects:
Electron emission
Density functionals
Atomic orbitals
Carbon nanotubes
Potassium
Electron transport
Online Access:View this record in EBSCOhost
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      dt: 12/17/2008
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        10.1021/ja805557g
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        atl: Electron Emission Originated from Free-Electron-like States of Alkali-Doped Boron—Nitride Nanotubes.
      aug:
        au:
          Binghai Yan
          Changwon Park
          Ihm, Jisoon
          Gang Zhou
          Wenhui Duan
          Noejung Park
        affil:
          Department of Physics and Astronomy, Seoul National University, Seoul 151-742, Korea
          Center for Advanced Study, Tsinghua University, Beijing 100084, People's Republic of China
          Department of Physics, Tsinghua University, Beijing 100084, People's Republic of China
          Department of Applied Physics, Dankook University, 126, Jukjeon-dong, Yongin-si, Gyeonggi-do, 448-701, Korea
      su:
        Electron emission
        Density functionals
        Atomic orbitals
        Carbon nanotubes
        Potassium
        Electron transport
      sug:
        subj:
          Electron emission
          Density functionals
          Atomic orbitals
          Carbon nanotubes
          Potassium
          Electron transport
      ab: 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.
      pubtype: Academic Journal
      doctype: Article
      src: R
    language: English
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