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Local charge transport at different interfaces in epoxy composites.

Beibei Jia1, Jun Zhou1, Yuqing Chen1

  • 1Center of Nanomaterials for Renewable Energy, State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China.

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Summary

Understanding charge transport in insulating composites is key for electrical insulation. This study reveals how charge mobility differs at Al2O3/epoxy and bubble/epoxy interfaces, offering insights into dielectric composite mechanisms.

Keywords:
charge transportinterfacenanocompositesnanoscaletrap

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Polymer Science

Background:

  • Charge transport in insulating composites is crucial for electrical breakdown strength.
  • A detailed understanding of nanoscale charge transport in these materials is lacking.

Purpose of the Study:

  • To investigate the local dynamic charge mobility and charge density in epoxy (EP) composites with Al2O3 and bubble interfaces.
  • To elucidate the mechanisms of charge transport at the nanoscale within these dielectric materials.

Main Methods:

  • Fabrication of two types of interfaces: Al2O3/EP and bubble/EP.
  • Utilizing *in situ* Kelvin probe force microscopy to explore charge behavior.
  • Applying external voltage in the horizontal direction to observe charge evolution.

Main Results:

  • Distinct charge transport behaviors were observed in the epoxy matrix, filler/bubble, and their interfaces.
  • The Al2O3/epoxy interface showed accumulation of negative charges and shallow traps.
  • Positive charges and deeper traps, hindering migration, were found around bubbles.

Conclusions:

  • The study provides experimental evidence for the differing charge transport mechanisms at various interfaces in epoxy composites.
  • Findings contribute to a deeper understanding of charge transport in dielectric composites, aiding in material design for enhanced electrical properties.