The mechanisms of thermally stimulated depolarization in poly(diphenylene phthalide)

The nature of the charge formed in a thin poly(diphenylene phthalide) film was studied by thermally stimulated depolarization over the temperature range 170–373 K. The influence of the strength of a polarizing electric field and the rate of temperature changes on the depolarization current spectrum was demonstrated. Polarizing electric field intensity changed from 3 × 10⁵ to 7 × 10⁵ V/cm. The rates of temperature changes were 3, 5, and 10 K/min. The depolarization current spectra contained three regions. The first two low-temperature regions were interpreted using the dipole and volume charge approximations, respectively. It was assumed that, in the third region, where charge inversion was observed, near the electrode polarization occurred. The experimental data were used to estimate activation energies and the relative charge released during relaxation in the first and second regions. The suggestion was made that the ratio between various contributions to depolarization current could be changed by varying the polarization field value.     

Evaluation of parameters of the potential barrier at the metal/polymer interface during recovery of the structure of nanocrystalline nickel

The influence of nanostructured nickel on the parameters of the potential barrier for conduction electrons at the metal/polymer interface has been investigated. It has been shown that conductivity in the multilayer nickel-polymer-vanadium system changes during annealing of nanocrystalline nickel at temperatures of the onset of the recovery of the structure. It has been established that the formation of the structure with a grain size of 100 nm in nickel leads to a noticeable decrease in the potential barrier height at the metal/polymer interface.     

Remote switching effect in the metal-polymer-metal system

The phenomenon of electronic switching in a thin polymer film caused by a change in the boundary conditions at the metal-polymer interface is studied. It is shown that the transition of the polymer into a high-conductivity state can be effected when the metal in which the position of the electrochemical potential changes is spatially separated from the region in the polymer film where electronic switching takes place. This phenomenon is explained using an injection model of the appearance of electrical conduction in a metal—polymer-metal structure.     

Recombination luminescence of poly(arylene phthalide) films: 2. Afterglow emission induced by electric excitation in poly(arylene phthalide) films

Absorption, luminescence and electroluminescence spectra of films of the unconjugated copolymer poly(arylene ether ketone) (CPAEK) were measured. Long-lasting afterglow emission was observed resulting from electro- and photoexcitation of the CPAEK films. and is possible mechanisms of generation are discussed.     

Oxygen sorption and thermal regeneration of sorption centers on catalysts of ammonia synthesis in helium and hydrogen flow

The interaction of oxygen with catalysts for ammonia synthesis in helium and hydrogen flow has been studied. Various catalysts sorb from 7 to 12 oxygen layers. 2 to 4 layers can be removed by thermal activation in helium, the rest only by hydrogenation in hydrogen.

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Charge transfer in a metal-polymer-nanocrystalline metal system

The electrical conductivity in a metal-polymer-nanocrystalline metal system has been investigated as a function of temperature. It is found that this system undergoes a transition to the high-conductivity state at temperatures of structural transformations in nanocrystalline electrodes. The results are interpreted within the model of charge instability that arises in thin polymer films under changes of the boundary conditions.     

Electroluminescence of a Polymer Film with a Polymer/Polymer Interface

JETP Letters - The effect of a two-dimensional quantum-confined structure formed at a polymer/polymer interface on the radiative recombination of excitons (i.e., electroluminescence) is...     

Generation and Fragmentation of Phthalide Derivative Negative Ions

Technical Physics - Molecules of diphenylphthalide and 3,3-diphenylphthalide-4′,4′-dicarbonic acid have been studied using the method of dissociative electron capture negative ion mass...     

The role of the wide-band-gap polymer layer for the existence of conductivity switching in the valve structure

The effect of electronic switching of the conductivity by a magnetic field lower than 500 mT has been implemented in the spin-valve structure in the “current perpendicular to plane” geometry with a transport layer of a wide-band-gap polymer to 1200 nm thick. The problem of spin transfer through the polymer layer has been discussed in the model of ballistic charge transport over nanoscale conducting channels.