Ñêà÷àòü ïîëíóþ âåðñèþ ñòàòüè (â PDF ôîðìàòå)
D. SAVCHENKO, A. KASSIBA, N. OGURTSOV, N. ERRIEN, M. MAKOWSKA-JANUSIK, A. PUD, S. KODZHI¬KIAN, and A. OUERIAGLI
«Synthesis and EPR-Method Investigation of Hybrid Nanomaterials with Kernel–Shell Structure (SiC/polymer)»
287–303 (2010)
PACS numbers: 68.37.Lp, 71.38.-k, 71.38.Mx, 72.80.Le, 76.30.-v, 77.22.Gm, 81.07.Pr
The method of electron paramagnetic resonance (EPR) is used to study hybrid nanomaterials with ‘kernel–shell’ structure consisting of nanoparticles of silicon carbide and conducting polyaniline. The paramagnetic centres (PC) and the transport phenomena in initial polymer and nanocomposite are studied with the effects arising on interface ‘kernel–shell’. Effects of saturation observed in EPR spectra of polymers testify to their high-level doping. At investigation of temperature behaviour of EPR spectra of the alloyed polymers, effects of spin memory are detected, while in hybrid ‘kernel–shell’ nanocomposites, neither effects of saturation, nor effects of memory are not revealed in spite of the fact that identical PC are observed in them. It is explained by different thermal stability and different level of doping in polymers and nanocomposites. The optimal level of polymers and nanocomposites doping is revealed using EPR and dielectric relaxation spectroscopy (DRS) methods. Comparison of transport properties of polymers and nanocomposites is performed. As revealed, the polarons are charge carriers in nanocomposites, while the bipolarons contribute significantly to conductivity of the initial alloyed polymers.
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