Effect of irradiation by 140 Mev Ag11+ ions on the optical and electrical properties of polypropylene/TiO2 composite

✍ Scribed by Anjum Qureshi; Dolly Singh; N.L. Singh; S. Ataoglu; Arif N. Gulluoglu; Ambuj Tripathi; D.K. Avasthi

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 873 KB
• Volume: 267
• Category: Article
• ISSN: 0168-583X
• DOI: 10.1016/j.nimb.2009.07.016

✦ Synopsis

Changes in the optical, structural, dielectric properties and surface morphology of a polypropylene/TiO 2 composite due to swift heavy ion irradiation were studied by means of UV-visible spectroscopy, X-ray diffraction, impedance gain phase analyzer and atomic force microscopy. Samples were irradiated with 140 MeV Ag 11+ ions at fluences of 1 Â 10 11 and 5 Â 10 12 ions/cm 2 . UV-visible absorption analysis reveals a decrease in optical direct band gap from 2.62 to 2.42 eV after a fluence of 5 Â 10 12 ions/cm 2 . X-ray diffractograms show an increase in crystallinity of the composite due to irradiation. The dielectric constants obey the Universal law given by e a f nÀ1 , where n varies from 0.38 to 0.91. The dielectric constant and loss are observed to change significantly due to irradiation. Cole-cole diagrams have shown the frequency dependence of the complex impedance at different fluences. The average surface roughness of the composite decreases upon irradiation.