access icon openaccess Investigation on space charge and charge trap characteristics of gamma-irradiated epoxy micro–nano composites

This is an open access article published by the IET and CEPRI under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/)
Received 25/07/2019, Accepted 28/10/2019, Revised 10/10/2019, Published 06/11/2019

Epoxy nano–micro composite specimen prepared with micro silica and ion trapping nanoparticle, by shear mixing process, was exposed to gamma radiation and its performance for space charge and charge trap characteristics were analysed. The threshold for space charge accumulation of epoxy nanocomposites reduces and rate of space charge accumulation increases with an increase in dosage of gamma irradiation. The average growth of space charge density during poling and charge decay rate during depoling are relatively higher for gamma-irradiated specimens than the virgin specimen. The initial surface potential has a marginal reduction with increase in the dosage of gamma radiation, but the surface potential decay rate has increased significantly. Trap distribution characteristics indicate more number of shallow traps and increase in charge mobility after irradiation. The relative permittivity and loss tangent of the specimens have high impact due to gamma irradiation. The activation energy calculated from DC conductivity by Arrhenius law reduces with increment in radiation dose. Laser-induced breakdown spectroscopy reflected no change in elemental composition with gamma-irradiated specimen. The variation in plasma temperature and ion line to atomic line intensity ratio with dosage of gamma radiation have direct correlation to the Vickers hardness number of the specimens.

Inspec keywords: Vickers hardness; spectrochemical analysis; carrier mobility; resins; filled polymers; space charge; electrical conductivity; nanomechanics; nanoparticles; gamma-ray effects; permittivity; nanocomposites; electron traps; silicon compounds; dielectric losses; surface potential; mixing

Other keywords: gamma-irradiated specimen; radiation dose; ion trapping nanoparticle; elemental composition; charge decay rate; gamma-irradiated epoxy microcomposites; trap distribution characteristics; plasma temperature; poling; relative permittivity; laser-induced breakdown spectroscopy; charge mobility; space charge density; gamma-irradiated epoxy nanocomposites; shear mixing process; microsilica; charge trap characteristics; Arrhenius law; ion line-atomic line intensity ratio; loss tangent; DC conductivity; surface potential decay rate; SiO2; activation energy; space charge accumulation; Vickers hardness number

Subjects: Other methods of nanofabrication; Dielectric breakdown and space-charge effects; Electrical properties of composite materials (thin films, low-dimensional and nanoscale structures); Dielectric permittivity; Dielectric loss and relaxation; Low-field transport and mobility; piezoresistance (semiconductors/insulators); Electromagnetic radiation spectrometry (chemical analysis); Fatigue, embrittlement, and fracture; Gamma ray effects; Fatigue, brittleness, fracture, and cracks; Charge carriers: generation, recombination, lifetime, and trapping (semiconductors/insulators)

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