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. 2020 Feb 29;11(3):260. doi: 10.3390/mi11030260

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© 2020 by the author.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

PMC Copyright notice

I–V characteristics of the CNT FED in a triode configuration. The insets show SEM images of a single FE cathode in a triode configuration. Figure 10a reprinted with permission from [66] and Figure 10b reprinted with permission from [120].