Flexible carbon nanotube-array cathodes: Fabrication and bending effect on field-electron emission

Hong, Nguyen Tuan; Koh, Ken Ha; Lee, Soonil; Tam, Ngo Thi Thanh; Minh, Phan Ngoc

doi:doi:10.1116/1.3363855

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Journal of Vacuum Science & Technology B / Volume 28 / Issue 2 / PAPERS FROM THE 22nd INTERNATIONAL VACUUM NANOELECTRONICS CONFERENCE / Fabrication

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J. Vac. Sci. Technol. B 28, C2C5 (2010); http://dx.doi.org/10.1116/1.3363855 (4 pages)

Flexible carbon nanotube-array cathodes: Fabrication and bending effect on field-electron emission

Nguyen Tuan Hong¹, Ken Ha Koh¹, Soonil Lee¹, Ngo Thi Thanh Tam², and Phan Ngoc Minh²

¹Division of Energy Systems Research, Ajou University, Suwon 443-749, Korea
²Institute of Materials Science, VAST, 18 Hoang Quoc Viet, Hanoi, Vietnam

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(Published online 30 March 2010)

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The authors report the fabrication of freestanding field-electron emitters based on arrays of vertically aligned carbon nanotubes (VACNTs) and flexible polydimethylsiloxane (PDMS). Transplant of VACNT arrays from silicon substrates to flexible PDMS platforms through a press-and-curing process resulted in PDMS-supported VACNT-array electron emitters. Test of field-electron emission from the PDMS-supported VACNT columns in a diode configuration showed good field-emission results regardless of cathode geometry, either planar or convex shape cathodes. Furthermore, the repeated bending of the PDMS-supported VACNT-column cathodes up to a few hundred times showed no noticeable degradation in field emission. Numerical simulations of electric field distribution at various bending angles and anode-cathode distance show that the general trend in emission-current variations is consistent with the difference in maximum electric field strength at the cathode surface.

ACKNOWLEDGMENTS

This work was supported by the Korea Science and Engineering Foundation (Grant No. R01-2008-000-20689-0) and by the Priority Research Centers Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (Grant No. 2009-0094049).

Article Outline

INTRODUCTION
EXPERIMENT
RESULTS AND DISCUSSION
CONCLUSION

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KEYWORDS and PACS

Keywords

carbon nanotubes, cathodes, curing, field emitter arrays, numerical analysis, polymers, carbon nanotubes (CNTs), polydimethylsiloxane (PDMS), tetrabutylammonium fluoride (TBAF), N-methelpyrrolidone (NMP)

PACS

85.45.Db

Field emitters and arrays, cold electron emitters
81.07.De

Nanotubes
81.20.-n

Methods of materials synthesis and materials processing

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History

Received 15 September 2009
Accepted 22 February 2010
Published online 30 March 2010

Digital Object Identifier

http://dx.doi.org/10.1116/1.3363855

PUBLICATION DATA

ISSN

1071-1023 (print)

1520-8567 (online)

Publisher

American Vacuum Society

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