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The Makrofol-KG polycarbonate (M-KG PC) films were irradiated with 45 MeV Li+3and 150 MeV Au+9ion beams at various fluences ranging from 1010to 1012 ions/cm2. Structural, chemical, and optical and surface properties were investigated by X-ray diffraction (XRD), Fourier transform infrared (FTIR), UV–visible, and atomic force microscopy (AFM), respectviely, as a function of ion fluences. UV–visible spectra exhibit a shift toward the higher wavelength regime after irradiation. This shift clearly reflects decrease in the optical band gap after irradiation. The FTIR spectra show a decrease in intensity of the typical bands. The XRD pattern of M-KG PC shows the decreasing intensity of peak with increase in ions fluence, which reflects loss of crystallinity of the films due to ion beam irradiation. AFM shows that the surface becomes rougher after irridation. The magnitude of the effect of irradiation is larger in the case of 150 MeV Au+9rather than 45 MeV Li+3ions due to high electronic energy loss of the Au ions in M-KG PC. The results can be discussed on the basis of linear energy transfer of the irradiated ions. [ABSTRACT FROM AUTHOR]

Semi-crystalline films (100 μ m) of the non-conducting polymer polyethylene terephthalate (PET) were exposed to swift heavy ions of 45 MeV Li3+ (Se=7.29E+00 eV/Å) and 120 MeV Au9+ (Se=1.157E+03 eV/Å) at ion fluence ranging from 1010 to 1012 ions/cm2. The chemical and structural properties were investigated using Fourier transform infra-red (FTIR) spectroscopy and X-ray diffraction techniques. The optical studies were carried out by UV-visible spectroscopy. It was noticed that the value of the band gap decreases with increasing fluence and depends on energy loss during interaction. A significant loss of crystallinity and change in the size of the particle are observed in irradiated PET. FTIR studies of the samples show the chemical changes after irradiation. The atomic force microscopy observation revealed that the surface morphology changes after irradiation. [ABSTRACT FROM AUTHOR]

Abstract: Commercially purchased CR-39 and PET polymers were irradiated by 100MeV O7+ ions of varying fluences, ranging from 1×1011 to 1×1013 ions/cm2. The effects of swift heavy ions (SHI) on the structural, optical and chemical properties of CR-39 and PET polymers were studied using X-ray diffraction (XRD), UV–visible spectroscopy and Fourier transform infrared (FTIR) spectroscopy. The XRD patterns of CR-39 show that the intensity of the peak decreases with increasing ion fluence, which indicates that the semicrystalline structure of polymer changes to amorphous with increasing fluences. The XRD patterns of PET show a slight increase in the intensity of the peaks, indicating an increase in the crystallinity. The UV–visible spectra show the shift in the absorbance edge towards the higher wavelength, indicating the change in band gap. Band gap in PET and CR-39 found to be decrease from 3.87 to 2.91 and 5.3–3.5eV, respectively. The cluster size also shows a variation in the carbon atoms per cluster that varies from 42 to 96 in CR-39 and from 78 to 139 in PET. The FTIR spectra show an overall reduction in intensity of the typical bands, indicating the degradation of polymers after irradiation. [Copyright &y& Elsevier]

Abstract: In the present study, CR-39 polymer of thickness 100μm is irradiated with swift heavy ions of Li+3 (45MeV), Ni+9 (120MeV) and Au+9 (120MeV) with ion fluence ranging from 1010 ion/cm2 to 1012 ion/cm2. The effects of swift heavy ions on the structural, optical and surface properties of CR-39 are determined. The structural and surface properties are investigated using X-Ray diffraction (XRD) and Scanning Electron Microscopy (SEM), whereas the optical studies are carried out employing UV–vis spectroscopy. UV–vis spectroscopy shows that the band gap of the polymer decreases with ion fluence. The decrease in band gap is more significant in the case of Au beam as compared to Li beam. The FTIR spectrum shows reduction in intensity of typical modes, indicating the degradation of polymer after irradiation. The X-ray diffraction patterns show the amorphous nature of CR-39 polymer. The SEM studies show a systematic change in the surface morphology of the polymers with ion fluence. [ABSTRACT FROM AUTHOR]