Universal field-emission model for carbon nanotubes on a metal tip

D. Y. Zhong; G. Y. Zhang; S. Liu; T. Sakurai; E. G. Wang

doi:10.1063/1.1430507

Universal field-emission model for carbon nanotubes on a metal tip

D. Y. Zhong, G. Y. Zhang, S. Liu, T. Sakurai, E. G. Wang

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99 Citations (Scopus)

Abstract

Electron-field-emission properties have been investigated systematically for carbon nanotubes (CNTs) fabricated on a metal tip. With a vacuum gap of 0.7mm, the threshold field is as low as 0.7V/μm and the current density approaches 10mA/cm² at an electronic field of 1.0V/μm. The emission current is quite stable with very low fluctuation. The emission behavior is in excellent agreement with Fowler-Nordheim theory and no current saturation is found even with an emission current reaching 1A/cm². A universal relationship 1/β=d₂/d+1/β₀ between the field amplification factor β and the vacuum gap d is developed within a two-region field-emission model. This relationship provides the basis for a microscopic understanding of CNT emitters and is applicable to other systems as well.

Original language	English
Pages (from-to)	506-508
Number of pages	3
Journal	Applied Physics Letters
Volume	80
Issue number	3
DOIs	https://doi.org/10.1063/1.1430507
Publication status	Published - 2002 Jan 21

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.1430507

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abstract = "Electron-field-emission properties have been investigated systematically for carbon nanotubes (CNTs) fabricated on a metal tip. With a vacuum gap of 0.7mm, the threshold field is as low as 0.7V/μm and the current density approaches 10mA/cm2 at an electronic field of 1.0V/μm. The emission current is quite stable with very low fluctuation. The emission behavior is in excellent agreement with Fowler-Nordheim theory and no current saturation is found even with an emission current reaching 1A/cm2. A universal relationship 1/β=d2/d+1/β0 between the field amplification factor β and the vacuum gap d is developed within a two-region field-emission model. This relationship provides the basis for a microscopic understanding of CNT emitters and is applicable to other systems as well.",

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AU - Zhong, D. Y.

AU - Zhang, G. Y.

AU - Liu, S.

AU - Sakurai, T.

AU - Wang, E. G.

PY - 2002/1/21

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N2 - Electron-field-emission properties have been investigated systematically for carbon nanotubes (CNTs) fabricated on a metal tip. With a vacuum gap of 0.7mm, the threshold field is as low as 0.7V/μm and the current density approaches 10mA/cm2 at an electronic field of 1.0V/μm. The emission current is quite stable with very low fluctuation. The emission behavior is in excellent agreement with Fowler-Nordheim theory and no current saturation is found even with an emission current reaching 1A/cm2. A universal relationship 1/β=d2/d+1/β0 between the field amplification factor β and the vacuum gap d is developed within a two-region field-emission model. This relationship provides the basis for a microscopic understanding of CNT emitters and is applicable to other systems as well.

AB - Electron-field-emission properties have been investigated systematically for carbon nanotubes (CNTs) fabricated on a metal tip. With a vacuum gap of 0.7mm, the threshold field is as low as 0.7V/μm and the current density approaches 10mA/cm2 at an electronic field of 1.0V/μm. The emission current is quite stable with very low fluctuation. The emission behavior is in excellent agreement with Fowler-Nordheim theory and no current saturation is found even with an emission current reaching 1A/cm2. A universal relationship 1/β=d2/d+1/β0 between the field amplification factor β and the vacuum gap d is developed within a two-region field-emission model. This relationship provides the basis for a microscopic understanding of CNT emitters and is applicable to other systems as well.

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Universal field-emission model for carbon nanotubes on a metal tip

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