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Effects of Metal Work Function and Contact Potential Difference on Electron Thermionic Emission in Contact Electrification

机译：接触电中金属功函数和接触电位差对电子热电子发射的影响

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摘要

Triboelectric nanogenerator (TENG) is a direct measure of the surface charge density, thus providing a novel and powerful tool to study the essential mechanism of contact electrification (CE). A variety of TENGs including a Pt-Al2O3 TENG, Au-Al2O3 TENG, Ti-Al2O3 TENG, Al-Al2O3 TENG, and SiO2-Al2O3 TENG are prepared in this study. After introducing initial charges on the Al2O3 surface of the TENGs, the long-term evolution of surface charge quantity is investigated at different temperatures. The results show that charge variation of all the TENGs is analogous to exponential decay and is in accord with the thermionic emission model, verifying the electron transfer dominated mechanism of CE. Additionally, it is explored for the first time that the potential barrier of materials can be regulated by changing the contacting metals or dielectrics. Regulation of the barrier at high temperatures fully excludes the influence of ions from moisture and functional groups, which further indicates the dominant role played by electron transfer in CE. Surface state models for explaining barrier regulation during CE for both metal-dielectric and dielectric-dielectric pairs are proposed. This study provides a new perspective of the exploration of CE, and a novel method for further increasing or rapidly eliminating electrification of charged materials.
机译：摩擦电纳米发电机（TENG）是表面电荷密度的直接量度，因此提供了一种新颖而强大的工具来研究接触带电（CE）的基本机理。在这项研究中，制备了多种TENG，包括Pt-Al2O3 TENG，Au-Al2O3 TENG，Ti-Al2O3 TENG，Al-Al2O3 TENG和SiO2-Al2O3 TENG。在将TENGs的Al2O3表面引入初始电荷后，研究了在不同温度下表面电荷量的长期演变。结果表明，所有TENGs的电荷变化都类似于指数衰减，并且符合热电子发射模型，证明了CE的电子转移主导机制。此外，这是第一次探索可以通过改变接触金属或电介质来调节材料的势垒。高温下对势垒的调节完全排除了来自水分和官能团的离子的影响，这进一步表明了电子转移在CE中起着主导作用。提出了用于解释CE期间金属-电介质和电介质-电介质对的势垒调节的表面状态模型。这项研究为CE的探索提供了新的视角，为进一步增加或快速消除带电材料的带电提供了一种新方法。

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  • 来源
    《Advanced Functional Materials》 |2019年第29期|1903142.1-1903142.8|共8页
  • 作者

    Xu Cheng; Zhang Binbin; Wang Aurelia Chi; Cai Wenzhe; Zi Yunlong; Feng Peizhong; Wang Zhong Lin;

  • 作者单位

    Chinese Acad Sci, Beijing Inst Nanoenergy & Nanosyst, Beijing 100083, Peoples R China|Georgia Inst Technol, Sch Mat Sci & Engn, Atlanta, GA 30332 USA|China Univ Min & Technol, Sch Mat Sci & Engn, Xuzhou 221116, Jiangsu, Peoples R China;

    Georgia Inst Technol, Sch Mat Sci & Engn, Atlanta, GA 30332 USA;

    Georgia Inst Technol, Sch Mat Sci & Engn, Atlanta, GA 30332 USA;

    China Univ Min & Technol, Sch Mat Sci & Engn, Xuzhou 221116, Jiangsu, Peoples R China;

    Georgia Inst Technol, Sch Mat Sci & Engn, Atlanta, GA 30332 USA|Chinese Univ Hong Kong, Dept Mech & Automat Engn, Shatin, Hong Kong, Peoples R China;

    China Univ Min & Technol, Sch Mat Sci & Engn, Xuzhou 221116, Jiangsu, Peoples R China;

    Chinese Acad Sci, Beijing Inst Nanoenergy & Nanosyst, Beijing 100083, Peoples R China|Georgia Inst Technol, Sch Mat Sci & Engn, Atlanta, GA 30332 USA|Univ Chinese Acad Sci, Sch Nanosci & Technol, Beijing 100049, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    contact electrification; contact potential; nanogenerator; thermionic emission; triboelectrification;

    机译：接触带电;接触电位;发生器;热电子发射;摩擦带电;

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