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Effects of B and N dopings and H2O adsorption on structural stability and field emission properties of cone-capped carbon nanotubes |
Wang Yi-Jun(王益军), Wang Liu-Ding(王六定), Yang Min(杨敏), and Yan Cheng(严诚) |
School of Science, Northwestern Polytechnical University, Xi'an 710129, China |
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Abstract The effects of B and N dopings and H2O adsorption on the structural stability and the field emission properties of cone-capped carbon nanotubes (CCCNTs) were investigated by using the density-functional theoretical calculation. The adsorption of H2O can increase the structural stability and decrease the gap between the highest occupied molecular orbital and the lowest unoccupied molecular orbital (HOMO-LUMO gap) of the CCCNTs. The strength of total electric field on the top of the H2O-adsorbed CCCNTs is larger than that of the B-doped and the N-doped CCCNTs, electrons will be emitted primarily from the H2O-adsorbed CCCNTs at the same applied voltage. Therefore, the H2O adsorption can lower the threshold voltage for the CCCNTs. While the B and the N dopings produce opposite effects. The HOMO-LUMO gap of the N-doped CCCNTs is the widest among all the gaps of the CCCNTs.
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Received: 22 June 2011
Revised: 08 August 2011
Accepted manuscript online:
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PACS:
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73.63.Fg
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(Nanotubes)
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79.70.+q
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(Field emission, ionization, evaporation, and desorption)
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31.15.ae
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(Electronic structure and bonding characteristics)
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Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 50771082, 60776822, and 11075135) and the
Natural Science Foundation of Shaanxi Education Department, China (Grant No. 09JK807). |
Cite this article:
Wang Yi-Jun(王益军), Wang Liu-Ding(王六定), Yang Min(杨敏), and Yan Cheng(严诚) Effects of B and N dopings and H2O adsorption on structural stability and field emission properties of cone-capped carbon nanotubes 2011 Chin. Phys. B 20 117304
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