Manipulating Nanoscale Contact Electrification by an Applied Electric Field

作者：Yusheng Zhou, Sihong Wang, Ya Yang, Guang Zhu, Simiao Niu, Zong‐Hong Lin, Ying Liu, Zhong Lin Wang · 发表于：Nano Letters · 年份：2014 · DOI：10.1021/nl404819w · 被引用次数：227 · 研究领域：Advanced Sensor and Energy Harvesting Materials、Electrowetting and Microfluidic Technologies、Conducting polymers and applications

Contact electrification is about the charge transfer between the surfaces of two materials in a contact-separation process. This effect has been widely utilized in particle separation and energy harvesting, where the charge transfer is preferred to be maximized. However, this effect is always undesirable in some areas such as electronic circuit systems due to the damage from the accumulated electrostatic charges. Herein, we introduced an approach to purposely manipulate the contact electrification process both in polarity and magnitude of the charge transfer through an applied electric field between two materials. Theoretical modeling and the corresponding experiments for controlling the charge transfer between a Pt coated atomic force microscopy tip and Parylene film have been demonstrated. The modulation effect of the electric field on contact electrification is enhanced for a thinner dielectric layer. This work can potentially be utilized to enhance the output performance of energy harvesting devices or nullify contact electric charge transfer in applications where this effect is undesirable.