Electron Emission Originated from Free-Electron-like States of Alkali-Doped Boron-Nitride Nanotubes
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- Electron Emission Originated from Free-Electron-like States of Alkali-Doped Boron-Nitride Nanotubes
- Yan, Binghai; Park, Changwon; Ihm, Jisoon; Zhou, Gang; Duan, Wenhui; Park, Noejung
- 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
- AMER CHEMICAL SOC
- JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, v.130, no.50, pp.17012 - 17015
- 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.
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