A Possibility for Construction of an Iodine Cleaning System Based on Doping for π-Conjugated Polymers

Improvement of Electrical Conductivity of In Situ Iodine-Doped Polypyrrole Film Using Atmospheric Pressure Plasma Reactor with Capillary Electrodes

To improve the electrical conductivity of polypyrrole (PPy) nanostructure film through in situ iodine (I2) doping, this study proposes an atmospheric pressure plasma reactor (APPR) where heated I2 dopant vapor is fed through capillary electrodes that serve as electrodes for discharge ignition. A large amount of the heated I2 vapor introduced into the reactor separately from a monomer gas can be effectively activated by an intense plasma via capillary electrodes. In particular, intensive plasma is obtained by properly adjusting the bluff body position in the APPR. Based on the ICCD and OES results, the I2 vapor injected through the capillary nozzle electrode is observed to form I2 charge species. The formed I2 species could directly participate in growing in situ I2-doped PPy films. Thus, in situ I2-doped PPy nanostructure films grown using the proposed APPR exhibit higher thicknesses of 15.3 μm and good electrical conductivities, compared to the corresponding non-doped films.

Optical Properties and Conductivity of PVA-H3PO4 (Polyvinyl Alcohol-Phosphoric Acid) Film Blend Irradiated by γ-Rays

This study assesses the optical properties and conductivity of PVA–H₃PO₄ (polyvinyl alcohol–phosphoric acid) polymer film blend irradiated by gamma (γ) rays. The PVA–H₃PO₄ polymer film blend was prepared by the solvent-casting method at H₃PO₄ concentrations of 75 v% and 85 v%, and then irradiated up to 25 kGy using γ-rays from the Cobalt-60 isotope source. The optical absorption spectrum was measured using an ultraviolet–visible spectrophotometer over a wavelength range of 200 to 700 nm. It was found that the absorption peaks are in three regions, namely two peaks in the ultraviolet region (310 and 350 nm) and one peak in the visible region (550 nm). The presence of an absorption peak after being exposed to hυ energy indicates a transition of electrons from HOMO to LUMO within the polymer chain. The study of optical absorption shows that the energy band gap (energy gap) depends on the radiation dose and the concentration of H₃PO₄ in the polymer film blend. The optical absorption, absorption edge, and energy gap decrease with increasing H₃PO₄ concentration and radiation dose. The interaction between PVA and H₃PO₄ blend led to an increase in the conductivity of the resulting polymer blend film.

Synthesis and Surface Observation of Montmorillonite/Polyaniline Composites

Polyaniline (PANI) is synthesized in the presence of montmorillonite (Mt). Mt has small spaces between its layers. This interlayer spacing functions as a reaction field for the production of PANI with an organized structure. Mt/PANI composites thus synthesized were characterized by the IR and the UV-Vis optical absorption spectroscopy measurements. Scanning electron microscopy observation showed that the PANI is covered by the flake structure of the Mt. A cylindrical structure was also observed in the sample. X-ray diffraction analysis indicated that the composite of the PANI and the Mt had an ordered structure, suggesting that the macroscopic structure of the natural clays can provide a unique reaction field for polymerization reactions.