Abstract
The rapid increase in electrical and electronic devices integration necessitates the urgent development of epoxy composites with more reliable surface-insulating performance. Charge traps with valley-like features are known to improve the surface-insulating characteristics of insulating materials. Inspired by this strategy, a new approach is reported herein for constructing peak-type charge barriers to enhance the surface-insulating performance of epoxy composites. This paper describes the construction of 0.92 eV peak-type charge barriers on the surface of an epoxy composite by doping with nanodiamonds (NDs), which have a negative electron affinity. The constructed barriers alter the charge migration behavior on the surface of the ND/epoxy composite. Consequently, the charge dissipation rate and surface flashover voltage of the ND/epoxy composite increase by 563% and 17.6%, respectively. Additionally, the NDs improve the arc resistance duration of the epoxy resin by 211%, owing to their electron-emitting effect under strong electrical fields. This strategy, by which the peak-type charge barriers constructed using the NDs exhibit excellent surface-insulating characteristics to the epoxy composites, can be adopted as a new approach to improve the surface-insulating abilities of materials.
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