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Zou, Haiyang; Guo, Litong; Xue, Hao; Zhang, Ying; Shen, Xiaofang; Liu, Xiaoting; Wang, Peihong; He, Xu; Dai, Guozhang; Jiang, Peng; Zheng, Haiwu; Zhang, Binbin; Xu, Cheng; Wang, Zhong Lin
Nature communications, 04/2020, Volume: 11, Issue: 1Journal Article
Contact-electrification is a universal effect for all existing materials, but it still lacks a quantitative materials database to systematically understand its scientific mechanisms. Using an established measurement method, this study quantifies the triboelectric charge densities of nearly 30 inorganic nonmetallic materials. From the matrix of their triboelectric charge densities and band structures, it is found that the triboelectric output is strongly related to the work functions of the materials. Our study verifies that contact-electrification is an electronic quantum transition effect under ambient conditions. The basic driving force for contact-electrification is that electrons seek to fill the lowest available states once two materials are forced to reach atomically close distance so that electron transitions are possible through strongly overlapping electron wave functions. We hope that the quantified series could serve as a textbook standard and a fundamental database for scientific research, practical manufacturing, and engineering.
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