Effects of an Oxygen-ion Beam (O17, 100 MeV) and c Irradiation on Polypyrrole Films

摘要

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 c-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 1010 to 3 1012 ions/cm2, and the c 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 c irradiation.