Visualization and standardized quantification of surface charge density for triboelectric materials

Yi Li, Yi Luo, Song Xiao, Cheng Zhang, Cheng Pan, Fuping Zeng, Zhaolun Cui, Bangdou Huang, Ju Tang, Tao Shao (), Xiaoxing Zhang (), Jiaqing Xiong () and Zhong Lin Wang ()
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Yi Li: Wuhan University
Yi Luo: Chinese Academy of Sciences
Song Xiao: Wuhan University
Cheng Zhang: Chinese Academy of Sciences
Cheng Pan: Wuhan University
Fuping Zeng: Wuhan University
Zhaolun Cui: South China University of Technology
Bangdou Huang: Chinese Academy of Sciences
Ju Tang: Wuhan University
Tao Shao: Chinese Academy of Sciences
Xiaoxing Zhang: Hubei University of Technology
Jiaqing Xiong: Donghua University
Zhong Lin Wang: Chinese Academy of Sciences

Nature Communications, 2024, vol. 15, issue 1, 1-14

Abstract: Abstract Triboelectric nanogenerator (TENG) operates on the principle of utilizing contact electrification and electrostatic induction. However, visualization and standardized quantification of surface charges for triboelectric materials remain challenging. Here, we report a surface charge visualization and standardized quantification method using electrostatic surface potential measured by Kevin probe and the iterative regularization strategy. Moreover, a tuning strategy on surface charge is demonstrated based on the corona discharge with a three-electrode design. The long-term stability and dissipation mechanisms of the injected negative or positive charges demonstrate high dependence on deep carrier traps in triboelectric materials. Typically, we achieved a 70-fold enhancement on the output voltage (~135.7 V) for the identical polytetrafluoroethylene (PTFE) based TENG (neg-PTFE/PTFE or posi-PTFE/PTFE triboelectric pair) with stable surface charge density (5% decay after 140 days). The charged PTFE was demonstrated as a robot e-skins for non-contact perception of object geometrics. This work provides valuable tools for surface charge visualization and quantification, giving a new strategy for a deeper understanding of contact electrification.

Date: 2024
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DOI: 10.1038/s41467-024-49660-9

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