Journal
VACUUM
Volume 115, Issue -, Pages 70-74Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.vacuum.2015.02.015
Keywords
CuO nanowires; CNT wrapping; Coverage; Field emission; Turn-on field
Funding
- Natural Science Foundation of China [61204062]
- Scientific Research Project for Universities - Fujian Education Department [JA12026]
- Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry
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Vertically aligned CuO nanowires are coated with CNT network films to achieve a significant improvement in field electron emission. The turn-on field of CuO nanowire array cathodes is decreased from 6.6 V/mu m to below 1.2 V/mu m owing to the CNT film coating. Compared to the needle-like CuO structures that could perforate the CNT film coating, CuO nanowires with uniform diameter are more suitable to be wrapped by CNT network films from top to bottom. It is found that the coverage of CNTs over CuO nanowire surface plays a role in affecting the turn-on fields and emission stabilities. (C) 2015 Elsevier Ltd. All rights reserved.
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