The influence of -radiation on the structure of Langmuir-Blodgett (LB) layers of poly (3-hexadecylthiophene) in mixtures containing stearic and linolenic acids has been studied. The action of -photons leads to structural changes in the conducting polymer backbone as well as to disrupting oriented LB film structures.
The influence of radioactive krypton85Kr on the surface properties of poly(3-pentylthiophene) has been studied. Irradiation by gaseous85Kr leads to structural polymeric chain changes, which induce after iodine doping the formation of charge-transfer complexes with iodine as well as with gaseous sulfur dioxide manifesting itself by the increased electric conductivity. The presence of ammonia brings about reaction with iodine bound in the complex with a conducting polymer.
The influence of -radiation on the d.c. conductivity of poly(3-hexadecylthiophene) (PHDT) doped with FeCl3 in chloroform, toluene, ethanol and nitrobenzene atmospheres has been studied. A different course of d.c. conductivity changes taking place in the atmosphere of solvent vapors (chloroform, toluene) and precipitants (ethanol, nitrobenzene) has been found. The character of changes can be influenced by polymer cross-linking initiated by -radiation.
Authors:G. Čík, J. Lesný, F. Šeršeň, J. Bartuš, and R. Pecníková
The influence of -radiation on iodinedoped poly (3-pentylthiophene) has been studied. Doping accompanied by -radiation brings about a decrease of iodine release rate. An increased dopant concentration in the poly (3-pentylthiophene) leads to an increased conductivity, which may be accounted for by the formation of bipolarons in the irradiated and doped samples.
The diffusion of sulfur dioxide into partially iodine-doped poly (3-dodecylthiophene) and poly(hexadecylthiophene) has been studied. A direct dependence of the diffusion rate on the alkyl group lengths was ascertained. The diffusion rate could be increased by irradiation of the polymers.
The influence of certain gases on the properties of thermally treated and -irradiated Langmuir-Blodgett (LB) films of poly (3-hexadecylthiophene) and stearic acid has been studied. Both the heat and -radiation brought about some structural surface layer changes, leading to temporal variations of the course of the in-plane conductivity of films affected by the presence of applied gases.
The influence of -radiation on the electric properties of Langmuir-Blodgett (LB) films of partially iodine-doped poly-(3-hexadecylthiophene) and stearic acid in interaction with selected environment-polluting gases has been studied. CO2, CO and NO2 increase the LB films conductivity and NO has a tendency to decrease the electric conductivity. The influence of -radiation was expressive onyl in the case of CO2, whereas NO2 brought about degradation of the conductive polymer.
Authors:J. Lesný, J. Tölgyessy, M. Harangozó, and G. Čík
The subject of this paper was to determine some radionuclides in fly-ashes of Czechoslovak origin.226Ra,228Ac and40K were chosen because of their high information value. The radiometric measurements were carried out by means of a semiconductor detector.
The magnetic properties of poly(3-dodecyl-thiophene) (PDDT) irradiated by -beams have been studied by measuring the magnetic susceptibility and EPR spectra. The irradiated PDDT is characterized, similarly as the non-irradiated one, by an antiferromagnetic course of magnetic susceptibility with a Néel temperature of 237 K. It is suggested that the antiferromagnetic properties of PDDT are caused by transformation of polarons to bipolarons, which takes place at lower temperatures.