Local charge transport at different interfaces in epoxy composites

Beibei Jia; Jun Zhou; Yuqing Chen; Zepeng Lv; Haomin Guo; Zixuan Zhang; Zihe Zhu; Haoyu Yu; Yang Wang; Kai Wu

doi:10.1088/1361-6528/ac705f

Local charge transport at different interfaces in epoxy composites

Nanotechnology. 2022 Jun 7;33(34). doi: 10.1088/1361-6528/ac705f.

Authors

Beibei Jia¹, Jun Zhou¹, Yuqing Chen¹, Zepeng Lv¹, Haomin Guo¹, Zixuan Zhang¹, Zihe Zhu¹, Haoyu Yu¹, Yang Wang², Kai Wu¹

Affiliations

¹ Center 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.
² School of Electronics and Information, Xi'an Polytechnic University, Xi'an 710048, People's Republic of China.

PMID: 35580551
DOI: 10.1088/1361-6528/ac705f

Abstract

Charge transport in insulating composites is fundamental to designing high performance in electrical breakdown strength processes. A fundamental understanding of the charge transport at nanoscale in insulating composites remains elusive. Herein, we fabricate two types of interfaces in epoxy (EP) composites (Al₂O₃/EP and bubble/EP, respectively). Then the local dynamic charge mobility behavior and charge density are explored usingin situKelvin probe force microscopy. After the external voltage in the horizontal direction is applied, significant differences are demonstrated in the evolution of charge transport for epoxy matrix, filler/bubble, and their interface, respectively. The interface between Al₂O₃and epoxy is easier to accumulate the negative charges and introduce shallow traps. Lots of positive charges are located around a bubble where deeper traps are present and could prevent charge migration. Thus, this work offers extended experimental support to understanding the mechanism of charge transport in dielectric composites.

Keywords: charge transport; interface; nanocomposites; nanoscale; trap.