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Journal of Applied Physics / Volume 98 / Issue 1 / NANOSCALE SCIENCE AND DESIGN

J. Appl. Phys. 98, 014315 (2005); http://dx.doi.org/10.1063/1.1949278 (4 pages)

Field-enhancement factor for carbon nanotube array

M. Wang, Z. H. Li, X. F. Shang, X. Q. Wang, and Y. B. Xu

Zhejiang University, Hangzhou, 310027, People’s Republic of China

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(Received 28 January 2005; accepted 16 May 2005; published online 13 July 2005)

To estimate the apex field-enhancement factor associated with an array of carbon nanotubes (CNTs) on a planar cathode surface, the model of the floating spheres between parallel anode and cathode plates was proposed. An approximate formula for the enhancement factor was derived showing that the intertube distance of a CNT array critically affects the field emission. When the intertube distance is less than the height of the tube, the enhancement factor decreases rapidly with decreasing distance in qualitative agreement with the numerical simulation. Considering the field-emission current density, the field emission can be optimized when the intertube distance is comparable with the tube height, in accordance with the results from the experiments. Finally, the influence of the anode-cathode distance on the enhancement factor was also discussed, showing that the anode-cathode distance has little effect on the field emission from a CNT array. Thus, we can reduce the theshold voltage to some extent by decreasing the anode-cathode distance.

© 2005 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. THE CALCULATION FOR THE ENHANCEMENT FACTOR OF CNT ARRAYS
  3. THE INFLUENCE OF ANODE-CATHODE DISTANCE

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KEYWORDS and PACS

Keywords

carbon nanotubes, cathodes, anodes, field emission, current density

PACS

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.1949278

PUBLICATION DATA

ISSN

0021-8979 (print)  
1089-7550 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    X. Zheng, G. H. Chen, Z. Li, S. Deng, and N. Xu, Phys. Rev. Lett. 92, 106803 (2004).

    A. Buldum and J. P. Lu, Phys. Rev. Lett. 91, 236801 (2003).

    X. Q. Wang, M. Wang, P. M. He, Y. B. Xu, and Z. H. Li, J. Appl. Phys. 96, 6752 (2004)JAPIAU000096000011006752000001.

    G. C. Kokkorakis, J. A. Roumeliotis, and J. P. Xanthakis, J. Appl. Phys. 95, 1468 (2004)JAPIAU000095000003001468000001.

    L. Nilssion et al., Appl. Phys. Lett. 76, 2071 (2000)APPLAB000076000015002071000001.

    S. Sub, K. S. Jeong, J. S. Lee, and I. Han, Appl. Phys. Lett. 80, 2392 (2002)APPLAB000080000013002392000001.

    A. Mayer, N. M. Miskovsky, P. H. Cutler, and Ph. Lambin, Phys. Rev. B 68, 235401 (2003).


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