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. 2022 Mar 11;12(6):933. doi: 10.3390/nano12060933

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© 2022 by the authors.

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 (https://creativecommons.org/licenses/by/4.0/).

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The effects of the coupling electrostatic energy and the relationship between PTFE ball diameter and electrode width on the output of the C–ENG: (a) the effect of cross-finger electrode width on the output of the C–ENG at the PTFE ball diameter of 6 mm; (b) the effect of cross-finger electrode width on the output of the C–ENG at the PTFE ball diameter of 8 mm; (c) a curve fitted according to Figure 3a; (d) a curve fitted according to Figure 3b; (e) a comparison of output characteristics between W–TENG and C–ENG at the PTFE ball diameter of 6 mm; and (f) a comparison of output characteristics between W–TENG and C–ENG at the PTFE ball diameter of 8 mm.