Young-Woo Son et al 2003 New J. Phys. 5 152 doi:10.1088/1367-2630/5/1/152
Electronic structure and the field emission mechanism of MgO-coated carbon nanotubes
Focus on Carbon NanotubesYoung-Woo Son1, Seungwu Han2,3 and Jisoon Ihm1
Show affiliationsPart of Focus on Carbon Nanotubes
In an attempt to improve the field emission (FE) characteristics of carbon nanotubes (CNTs), we have performed a first-principles study on MgO-coated CNTs. A MgO slab covering a CNT tip under a strong electric field shows dielectric screening behaviours with applied electric fields up to 0.3 V Å−1 and the effective dielectric constant approaches the bulk value within a few MgO layers. It is also found that the surface conduction band state of the MgO slab shifts down to the Fermi level as the applied electric field increases, indicating a FE mechanism different to that for CNTs without insulator coating. Electron emission via the surface conduction band of the insulator at the Fermi level is expected to enhance the FE current significantly, in agreement with a recent experiment.
- PACS
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77.22.Ch Permittivity (dielectric function)
73.20.At Surface states, band structure, electron density of states
71.15.-m Methods of electronic structure calculations
79.70.+q Field emission, ionization, evaporation, and desorption
- Subjects
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Condensed matter: electrical, magnetic and optical
- Dates
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Issue 1 (November 2003)
Received 4 August 2003
Published 14 November 2003
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Electronic structure and the field emission mechanism of MgO-coated carbon nanotubes
Young-Woo Son et al 2003 New J. Phys. 5 152
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-
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-
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-
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-
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-
Charged fluid without electric field: a generalization of the Godel solution
N V Mitskievic and G A Tsalakou 1991 Class. Quantum Grav. 8 209
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