Studies on electrical conductivity of gamma irradiated polyaniline

Investigation on the effects of beta and gamma irradiation on conducting polymers for sensor applications

“…The first mechanism is free radical formation along the polymer backbone via chain scission. It is assumed that when free radical formation is the dominating event during irradiation at a particular total dose, the surface conductivity would decrease due to defects (interruptions) being formed in the electrical pathway through the sample (Yao et al, 1993). As a result, the interchain polaron migration is much less efficient, creating a barrier to charge transport (Wolszczak et al, 1995).…”

“…The direct implementation of conducting polymers as radiation sensor materials has not yet been commercialized due to differing conductivity responses with total dose, dose rate, etc. Some have reported a large increase in the surface conductivity with radiation dose (Yao et al, 1993) while others report a marked decrease in conductive properties (Wolszczak et al, 1995); these differing observations may reflect the competing mechanisms of chain scission and cross-linking. However, it is clear that the radiation dose effects on conducting polymers must be fully understood before these materials can be used as sensing devices.…”

Remotely Interrogated Passive Polarizing Dosimeter (RIPPeD).

“…Unfortunately, there are also reports showing the opposite result. Gamma ray irradiation was shown to produce increased conductivity in polyaniline 28 as was heavy ion irradiation in conducting polypyrrole 29 and polythiophene 30 . In light of these apparently contradictory results, it is imperative that the material being used here be studied experimentally.…”

The Effect of Gamma Irradiation on the Energy Gap of Polyanniline Thin Films Prepared by Non-thermal Plasma Jet

“…Another positive aspect is the fact that polyaniline is very inexpensive. The effects of gamma radiation on polymers have already been investigated [10,7], and the results indicatea linear correlation of polymer conductivity with the applied dose in some cases. The radiation interaction mechanisms with the polyaniline are quite distinct.…”

“…Due to its high chemical and thermal stability and the ease of polymerization, together with the relative low cost of production it alsohas the potential of many technological P applications [9]. But the studies of polyaniline subjected to ionizing radiation have not yet attracted application.The present work is a study of the γ-radiation induced changes in physical properties of nanocrystallinepolyaniline thin film, deposited onto a glass substrate.…”