Swift heavy ion induced modification in dielectric and microhardness properties of polymer composites |
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Authors: | NL Singh Sejal Shah F Singh V Ganesan |
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Institution: | a Department of Physics, M.S. University of Baroda, Vadodara 390 002, India b Inter University Accelerator Centre, Aruna Asaf Ali Road, New Delhi 110 067, India c UGC-DAE, CSR, University Campus, Khandwa Road, Indore 452017, India |
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Abstract: | Polymer composites with different concentrations of organometallics (ferric oxalate) dispersed PMMA were prepared. PMMA was synthesized by solution polymerization technique. These films were irradiated with 120 MeV Ni10+ ions in the fluence range 1011-5 × 1012 ions/cm2. The radiation induced modifications in dielectric properties, microhardness, structural changes and surface morphology of polymer composite films have been investigated at different concentrations of filler and ion-fluences. It was observed that electrical conductivity and hardness of the films increase with the concentration of the filler and also with the fluence. The dielectric constant (?) obeys the Universal law given by ?αfn−1. The dielectric constant/loss is observed to change significantly due to irradiation. This suggests that ion beam irradiation promotes the metal to polymer bonding and convert polymeric structure into hydrogen depleted carbon network. This makes the composites more conductive and harder. Surface morphology of the films has been studied using atomic force microscopy (AFM) and scanning electron microscopy (SEM). The average surface roughness is observed to increase after irradiation as revealed by AFM studies. The SEM images show the blisters type of phenomenon on the surface due to ion beam irradiation. |
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Keywords: | Composites SHI irradiation Dielectric properties Atomic force microscopy (AFM) FTIR |
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