EPR investigations are carried out on functional hybrid nanocomposites associating silicon carbide (SiC) nanoparticles and polyaniline. The nanoparticle surfaces are functionnalised by the polymer being arranged as thin layer (1-5 nm thick). The conductivity of polyaniline was modulated by camphor sulfonic acids (CSA) as dopants. The EPR spectra in different systems (polymer, SiC, nanocomposites) were investigated as function of the doping rate and versus the sample temperature in the range (4K,450K). Analysis of the EPR spectra evidences the relevance of two contributions. The first occurs from dangling bonds and radicals well localised on the polymer backbone. The second type of paramagnetic centres seems to correlate with delocalised unpaired spins induced by the acid doping. The thermal evolution of the spin susceptibility is satisfactory accounted by the thermal activation of paramagnetic centres. The relaxation mechanism probed by the EPR line widths point out the relevance of short relaxation times for the unpaired spin carriers and longer ones of the polymer chains. The evolution of the EPR spectra intensity after annealing at 450K is marked by a relatively stable spin carriers in composites materials while a net decrease occurs in the solely doped polymer. A discussion of the stability and the features of polarons and bipolarons in these composites will drawn from the features of the EPR results.

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