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Manipulating nanoscale contact electrification by an applied electric field
Yu Sheng Zhou1, Sihong Wang, Ya Yang
1School of Materials Science and Engineering, Georgia Institute of Technology , North Ave NW, Atlanta, Georgia 30332-0245, United States.
Nano Letters
|February 1, 2014
Summary
We demonstrate controlling contact electrification, the charge transfer between surfaces, using an applied electric field. This method can enhance energy harvesting or prevent electrostatic damage in electronic systems.
Area of Science:
- Physics
- Materials Science
- Electrical Engineering
Background:
- Contact electrification involves charge transfer between contacting surfaces.
- This phenomenon is exploited in particle separation and energy harvesting but can cause damage in electronics.
- Existing methods lack precise control over charge transfer polarity and magnitude.
Purpose of the Study:
- To introduce a method for manipulating contact electrification using an applied electric field.
- To control both the polarity and magnitude of charge transfer.
- To explore applications in energy harvesting and electrostatic discharge prevention.
Main Methods:
- Theoretical modeling of charge transfer under an applied electric field.
- Experimental validation using a platinum-coated atomic force microscopy tip and Parylene film.
- Systematic variation of applied electric field strength and dielectric layer thickness.
Main Results:
- Demonstrated precise control over contact electrification polarity and magnitude via an electric field.
- Observed enhanced modulation of charge transfer with thinner dielectric layers.
- Quantified the relationship between applied field strength and charge transfer.
Conclusions:
- An applied electric field effectively manipulates contact electrification.
- This technique offers a pathway to optimize energy harvesting devices.
- The method provides a means to mitigate undesirable electrostatic charge accumulation in sensitive systems.
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