Abstract
The formation of carbonaceous clusters in swift heavy ion irradiated polymer films has been investigated extensively. The information about these clusters may be obtained from Ultraviolet–Visible (UV−Vis) spectroscopic studies. The optical band gap (Eg), calculated from the absorption edge of the UV spectra of these polymers can be correlated to the number of carbon atoms (N) in a cluster with the Tauc equation. Films of 50μm, 80μm, 125μm, 250μm thicknesses of PET, PTFE, PMMA and PES polymers, respectively, were irradiated with Si8+ ions of energy 100MeV to different fluences from 1010 to 1013ions/cm2 at Pelletron accelerator, Inter University Accelerator Centre, New Delhi, India. UV–Vis absorption studies show that optical energy gap decreases with transferred energy density of the ion beams. The energy band gap (Eg) values were computed from the absorption edge in the 200–800nm region with the Tauc relation. The values vary from 3.86 to 1.61eV for the pristine and various irradiated polymer samples. Maximum change of 40% is observed in PES irradiated to 1013ions/cm2. The cluster size shows a variation in the range of 79–454carbon atoms per cluster for the polymers studied here.
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