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Abstract
The aim of this work was to investigate the conductivity mechanisms of a bionanocomposite of chitosan-silver nanoparticles. The DC conductivity in dry samples shows that the composite exhibits a percolation threshold at about 2% volume fraction of nanoparticles. For films with less than 2%, the temperature dependence of the DC conductivity in the range 2–70°C exhibits the two-dimensional hopping conductivity. For all nanocomposites in the temperature range 70–180°C, both conductivity and relaxation times obtained from electrical module measurements demonstrate an Arrhenius-type temperature dependence. This behavior is associated with the migration property of movable hydrogen ions and the formation of dipolar structures.
Acknowledgment
This work was partially supported by CONACYT of Mexico. The authors are grateful to J. A. Muñoz-Salas for the technical assistance in electrical measurements.