Sangeeta Prasher

Electrical and Optical Properties of O6+ Ion Beam–Irradiated Polymers

Variations in dielectric, optical, and structural properties of Lexan and Kapton-H irradiated to 80 MeV O6+ ion beam were analyzed at different fluences ranging from 1011 to 1013 ions/cm2 with a scanned beam current of 1 pnA. The structural modifications were characterized with the help of FT-IR and UV-vis spectroscopies. The electrical properties were investigated through capacitance and dielectric loss variations in ion-irradiated and pristine polymers at different frequencies. UV-vis absorption analysis indicates a decrease in the band gap energy in the two polymers. However, the decrease is much more prominent in Lexan (30%) than in Kapton-H (2.5%). The dielectric constant does not show appreciable variations after ion irradiation; however, a small increase has been noticed. An overall increase in the intensities of some typical bonds and stretching was observed in the FT-IR spectra of the pristine and ion-irradiated polymers.

Structural and Thermal Adaptations in Polyaniline Emeraldine Salt Composites with Ferrous Oxalate

We report on the modifications induced in the structural, optical and electrical properties of polyaniline onto the ferrous oxalate composites of the polymer. Fourier transform infrared spectra, x-ray diffraction patterns and digital thermal analysis studies have been employed to associate the modifications induced in the polymer due to the enhanced dopant concentration. The studies revealed that the cation dopant may bond with the lone pair of N- of the polymer, making the polymer stretched and crystalline. The polymer has been greatly influenced at the maximum dopant concentration. It seems that the dopant has modified the initial conformation of the polymer, whereas the main chain has remained unchanged. The thermal studies also indicate that the polymer has been stabilized to a greater extent on doping.