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

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5 Author(s)
Hong, Nguyen Tuan ; Division of Energy Systems Research, Ajou University, Suwon 443-749, Korea ; Koh, Ken Ha ; Lee, Soonil ; Tam, Ngo Thi Thanh
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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.

Published in:

Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures  (Volume:28 ,  Issue: 2 )