Manipulating nanoscale contact electrification by an applied electric field.
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.
School of Materials Science and Engineering, Georgia Institute of Technology , North Ave NW, Atlanta, Georgia 30332-0245, United States.
Yu Sheng
YS
Zhou
Sihong
S
Wang
Ya
Y
Yang
Guang
G
Zhu
Simiao
S
Niu
Zong-Hong
ZH
Lin
Ying
Y
Liu
Zhong Lin
ZL
Wang