Contents INTRODUCTION
With a further study in polymeric nanocomposite, more and more attention has been paid to dielectric behavior and carrier transportation mechanism and it is shown by some research results that nano particles might improve dielectric properties to some extent [1]. With the study, some exciting news on polymer/nano metal particles has been reported due to it extraordinarily excellent dielectric properties. For example, permittivity could be enhanced via blending nano silver into polymer to increase energy density of a capacitor in an energy storage unit. Professor X. L. Cao has reported an abnormal dielectric behavior explained with Column blockade effect [2]. S. Radhakrishnan et al. found the conductivity of polypyrrole containing copper chloride follow the Poole-Frenkel effect [3]. P. Karanjal reported that the conductivity of polypropylene containing iodine could be explained with a three-dimensional Pooler-Frenkel effect [4]. Though some papers on dielectric behavior have been published, there is still lacking of adequate results on high field conduction in composites of polymer/nano metal particles. It is a common methodology to fit the curve of conductivity~ stress via a kind of mathematic formula. Then values of some parameters could be drawn from the fitted mathematic formula, such as relative dielectric constant could be deduced from Schottky effect, Poole-Frenkel effect), activation energy could be drawn from ion hopping conduction model), ion hopping distance could be drawn from ion hopping conduction model). With the information of and , the carrier transportation in the polymer nanocomposite could be well understand in one hand, and the true conduction mechanism could be confirmed with the help of comparing those parameters with measured ones.
