Interaction of oxygen (O+7) ion beam on polyaniline thin films

Abstract

High-energy ion beam irradiation of the polymers is a good technique to modify the properties such as electrical conductivity, structural behaviour and mechanial properties. Polyaniline thin films doped with hydrochloric acid (HCl) were prepared by oxidation of ammonium persulphate. The effect of Swift Heavy Ions irradiation on the electrical and structural properties of polyaniline has been measured in this study. Polyaniline films were irradiated by oxygen ions (energy 80 MeV, charge state O +7 ) with fluence varying from 1 × 10 10 to 3 × 10 12 ions/cm 2 . The studies on electrical and structural properties of the irradiated polymers were investigated by measuring V-I using four probe set-up and X-ray diffraction (XRD) using Bruker AXS, X-ray powder diffractometer. V-I measurements shows an increase in the conductivity of the film, XRD pattern of the polymer shows that the crystallinity improved after the irradiation with Swift Heavy Ions (SHI), which could be attributed to cross linking mechanism.

Characterization of the chemical and structural modifications induced by X rays on the HEMA based polymer gel

“…After exposure to irradiation, the physical and chemical properties of polymers change due to induced cross-links, chain cleavage, and formation of new chemical bonds [14]- [20]. Radiation causes structural changes that can affect different properties of polymer gel dosimeters, such as proton nuclear magnetic resonance relaxation times, mass density, opacity, and elasticity [21].…”

A chemiresistive sensor based on conducting polymer/SWNT composite nanofibrillar matrix—effect of 100 MeV O16ion irradiation on gas sensing properties

“…Bulk polymeric materials, mostly in form of thin films, have been reported to exhibit morphological deformation [1] due to a high amount of energy transfer when subjected to SHI irradiation. More profusely, such irradiation also enhances the conductivity of polymeric films [1,16,17], attributed to the individual or cumulative effects of (i) cross linking, enhancing the charge carrier mobility through polymer chains by restricting the requirement of interchain hopping for conduction between two chains [16][17][18][19][20], and (ii) creation of defect sites in the molecular structure of the polymer chain, which introduces polaronic sites [21] and/or plasmon excitation [22] in the backbone, resulting in the accumulation of electrons and thereby affecting the overall conductivity. Recrystallization of the polymeric structure [1,[19][20][21][22][23] is also known to enhance conductivity.…”

Swift heavy ion irradiation-induced enhancement in structural, conformational and electrical properties of polyaniline nanofibers

“…In a previous study, Hussain et al (8) reported the Ni 12+ SHI ion irradiation effects on HCl-doped PAni where an improvement in conductivity, degree of crystallinity and electrochemical stability has been observed with increasing ion fluence which can be attributed to the formation of more close-packed regions with aligned chains by chain folding or cross-linking due to the large electronic energy deposition. Chandra et al (9) reported the effects of 80 MeV O 7+ ion irradiation on the electrical and structural properties of PAni where an enhancement in the crystallinity and current-voltage (I-V characteristics has been observed after SHI irradiation. Although, there are a few reports on the conduction mechanism of ion-irradiated polymers (10)(11)(12), the charge conduction in irradiated polymers is still a mystery due to the complex structure of the polymers.…”