接触起电过程中的电子转移动力学及其对摩擦发光强度的影响
The electron transfer dynamics in the contact electrification and its effects on the intensity of triboluminescence
摘要：
随着能源危机的威胁和微电子设备的需求不断增加，人们正在寻找潜在的替代能源，以取代传统的能源，如化石燃料。基于接触起电原理的摩擦纳米发电机（TENG）因其结构简单、成本低、性能好而成为最有前途的新型发电机之一。虽然在确定TENG的电荷转移量方面起着至关重要的作用，但绝缘体-绝缘体接触的接触带电中电荷转移的基本机制仍然没有完全理解。本文通过观察滑动接触的摩擦发光现象，研究了接触起电过程中电荷转移的动力学过程，提出了绝缘体-绝缘体接触起电的理论模型。在本“电容器模型”中，电子隧穿被假定为起电中的主导机制，并且用于电子转移的驱动力是接触电势差，因此，起电被认为是由接触表面形成的电容器的充电过程。由本模型和实验的预测之间的一致性可以再次确认，电子转移是在绝缘体-绝缘体接触的接触带电的主导过程。
英文摘要：
With the growing threat of energy crisis and the increasing need to power microelectronic devices, people are seeking potential alternative energies that can replace the conventional sources such as fossil fuels. Due to its simple structure, low cost, and high performance, the triboelectric nanogenerator (TENG) which is based on the contact electrification has become one of the most promising candidates. Although plays a crucial role in determining the amount of charge transfer of TENG, the fundamental mechanism that underlies the charge transfer in the contact electrification of insulator-insulator contacts has still not been completely understood. In this paper, the dynamics of charge transfer in the contact electrification is investigated by observing the triboluminescence of the sliding contacts and a theoretical model is proposed for the electrification of insulator-insulator contacts. In the present "Capacitor model", the electron tunneling is assumed to be the dominating mechanism in the electrification and the driving force for the electron transfer is the contact potential difference, and thus, the electrification is considered as a charging process of the capacitor formed by the contact surfaces. The consistency between the predictions by the present model and the experiments may confirm again that the electron transfer is the dominant process in the contact electrification of insulator-insulator contacts.
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