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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/).

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Influence of a design of a cathode on its emission: (a) the graph presenting simulation results for the FE cathode being a flat film and a bundle—the trend in electric field enhancement upon the distance from the center of the cathode, and the inset shows the bundle SEM image (left) and a schematic image (right); (b) the FE characteristic of the cathodes arrays with various distances between them, and the inset shows SEM images of these FE cathodes. Figure 9a,b reprinted with permission from [118,119], respectively.