Study on Micro Interfacial Charge Motion of Polyethylene Nanocomposite Based on Electrostatic Force Microscope.

Area of Science:

• Materials Science
• Electrical Engineering
• Nanotechnology

Background:

• Interface area is crucial for nano-dielectric properties, particularly in suppressing space charge.
• Understanding charge behavior at the microscale is essential for improving dielectric performance.

Purpose of the Study:

• To investigate the role of the interface area in charge movement and suppression at a microscopic level.
• To elucidate the mechanism by which interface areas affect space charge dynamics in nano-dielectrics.

Main Methods:

• Utilized gradual discharge under electrostatic force microscopy (EFM) to observe charge movement on pure LDPE and SiO2/LDPE nanocomposites.
• Employed pulsed electro-acoustic (PEA) short-circuited tests to analyze charge decay after injection.
• Correlated EFM and PEA test results to validate findings on charge decay trends.

Main Results:

• Observed charge movement towards and trapping within the interface area of SiO2/LDPE nanocomposites.
• Demonstrated that trapped charges at the interface act as a barrier, inhibiting further charge injection.
• Confirmed consistency between charge decay trends observed in EFM and PEA tests.

Conclusions:

• The interface area in nano-dielectrics plays a significant role in inhibiting space charge injection at the microscale.
• Charge trapping at the interface enhances overall dielectric performance.
• Findings provide experimental validation for theoretical research on space charge suppression in nano-dielectrics.