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Effects of an oxygen‐ion beam (O +7 , 100 MeV) and γ irradiation on polypyrrole films
Author(s) -
Chandra Subhash,
Annapoorni S.,
Singh Fouran,
Sonkawade R. G.,
Rana J. M. S.,
Ramola R. C.
Publication year - 2009
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.31146
Subject(s) - polypyrrole , materials science , irradiation , scanning electron microscope , crystallinity , fluence , amorphous solid , analytical chemistry (journal) , polymer , chemistry , crystallography , polymerization , organic chemistry , physics , nuclear physics , composite material
Nanostructured polypyrrole films doped with para ‐toluene sulfonic acid were prepared by an electrochemical process, and a comparative study of the effects of swift heavy ions and γ‐ray irradiation on the structural and optical properties of the polypyrrole was carried out. Oxygen‐ion (energy = 100 MeV, charge state = +7) fluence varied from 1 × 10 10 to 3 × 10 12 ions/cm 2 , and the γ dose varied from 6.8 to 67 Gy. The polymer films were characterized by X‐ray diffraction, ultraviolet–visible spectroscopy, and scanning electron microscopy. The X‐ray diffraction pattern showed that after irradiation, the crystallinity improved with increasing fluence because of an increase in the crystalline regions dispersed in an amorphous phase. The ultraviolet–visible spectra showed a shift in the absorbance edge toward higher wavelengths, which indicated a significant decrease in the band gap of the polypyrrole film after irradiation. The scanning electron microscopy study showed a systematic change in the surface of the polymer. A similar pattern was observed with the γ irradiation. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010