Study of optical band gap and carbon cluster sizes formed in 100 MeV Si8+ and 145 MeV Ne6+ ions irradiated polypropylene polymer |
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Authors: | Rajesh Kumar S Asad Ali A H Naqvi H S Virk Udayan De D K Avasthi and Rajendra Prasad |
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Institution: | (1) Department of Applied Physics, Z. H. College of Engineering & Technology, Aligarh Muslim University, Aligarh, 202 002, Uttar Pradesh, India;(2) 360 Sector-71, SAS Nagar (Mohali), Chandigarh, 160 071, Punjab, India;(3) Variable Energy Cyclotron Centre, 1/AF, Bidhan Nagar, Kolkata, 700 064, India;(4) Inter-University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi, 110 067, India |
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Abstract: | A wide variety of material modifications in polymers have been studied by using ion irradiation techniques. Extensive research
has focused on to Swift Heavy Ions (MeV’s energy), probably because of good controllability and the large penetration length
in polymers. High energy ion irradiation tends to damage polymers significantly by electronic excitation and ionization. It
may result into the creation of latent tracks and can also cause formation of radicals such as ablation, sputtering, chain
scission and intermolecular cross-linking, creation of triple bonds and unsaturated bonds and loss volatile fragments. Polypropylene
polymer films of thickness 50 μm were irradiated to the fluences of 1 × 1010, 3 × 1010, 1 × 1011, 3 × 1011, 6 × 1011 and 1 × 1012 ions/cm2 with Si8+ ions of 100 MeV energy from Pelletron accelerator at Inter University Accelerator Centre (IUAC), New Delhi and Ne6+ ions of 145 MeV to the fluences of 108, 1010, 1011, 1012 and 1013 ions/cm3 from Variable Energy Cyclotron Centre, Kolkata. Optical modifications were characterized by UV towards the red end of the
spectrum with the increase of the fluence. Value of optical band gap E
g
shows a decreasing trend with ion fluence irradiated with both kinds of ions. Cluster size N, the number of carbon atoms per conjugation length increases with increasing ion dose. Cluster size also increases with the
increase of electronic stopping power.
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Keywords: | Polypropylene polymer silicon and neon ions ion beam modification carbon clusters band gap energy |
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