State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources China Electric Power University 022062's Republic of China;
Hebei Provincial Key Laboratory of Power Transmission Equipment Security Defense China Electric Power University 071003's Republic of China;
State Grid Changchun Power Supply Company 13000's Republic of China;
plasma fluorination; ZnO nanofller; epoxy resin; surface flashover; charge trap; density functional theory(Some figures may appear in colour only in the online journal);