Enhanced Dielectric Properties in Epoxy Resin Utilizing Nano-Molybdenum Disulfide Fillers

Epoxy-based materials are widely utilized in electrical and electronic equipment due to their favorable insulation and mechanical properties. However, high-voltage stress and compact design in these apparatuses impose strict requirements for higher dielectric strength. In this work, a novel promising nanofiller, namely, nano-diodes of molybdenum sulfide (MoS 2 ), was introduced to enhance the electrical properties of epoxy, and five groups of MoS 2 -doped epoxy composites with varying concentrations were prepared. A series of electrical insulation properties, including dielectric parameters, breakdown strength, and trap characteristics, were tested. The results indicated that the breakdown strength of the composite with 0.3% MoS 2 increased by 34.93% compared to pure epoxy resin. In addition, the insulation performance of the composite materials showed an initially increasing and then decreasing trend with MoS 2 concentration. The enhancement of insulation properties can be attributed to the charge traps introduced by the MoS 2 fillers. The results proved that the comprehensive performances of EP-based nanocomposites were effectively improved by MoS 2 nanoparticles, showing great application potential in high-voltage insulated power equipment.