Proton Beam Induced Modification of Luminescence Properties of Polystyrene/Al2O3 Polymer Nanocomposites

  • Shilpa BhavsarEmail author
  • N. L. Singh
  • S. V. Suryanarayana
  • K. V. R. Murthy


Polystyrene polymer (PS)/Al2O3 nanocomposite films were synthesized from PS:Al2O3 (1–x):x mixtures (x = 3 wt%) via solution casting method. These nanocomposite films were exposed to 5 MeV proton beam of different fluences. The proton beam induced changes in optical and luminescence properties of PS and PS:Al2O3 films have been investigated using FTIR, UV-visible, Photoluminescence and thermoluminescence studies. FTIR studies concede reduction in the peak intensity due to doping of Al2O3 and proton irradiation. The UV-visible spectra show shifting of absorption edge with increasing fluence. This can be attributed to creation of conjugated system of bonds. The band gap of PS and 3 wt% Al2O3 doped PS is observed to be 4.38 eV and 4.34 eV, respectively, whereas the band gaps of proton irradiated 3 wt% Al2O3 doped PS films are found to be 4.28 eV and 4.23 eV at the fluences of 1 × 1012 ions/cm2 and 1 × 1013 ions/cm2, respectively. The photoluminescence emission spectra show three peaks, wavelength at 411 nm, 435 nm and 462 nm corresponding to the PS in violet-blue region when excited with near UV wavelength of 380 nm. The intensity of emission peaks was found to increase with increasing fluence. The thermoluminescence curves of PS/Al2O3 were analysed using glow curve deconvolution method (GCD). The increase in TL peak intensity of the glow curve was observed as fluence increase.


Polymer nanocomposites Proton irradiation Photoluminescence Thermoluminescence 



The financial support provided by IUAC, New Delhi is also gratefully acknowledged. Authors are thankful to Dr. Balak Das, Dept. of Physics, University of Lucknow for providing XRD measurement.


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Authors and Affiliations

  1. 1.Department of PhysicsThe M. S. University of BarodaGujaratIndia
  2. 2.Nuclear Physics DivisionBhabha Atomic Research CentreMumbaiIndia
  3. 3.Department of Applied PhysicsThe M. S. University of BarodaGujaratIndia

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