Studies on the Dielectric and Transport Properties of PEO/Chitosan Proton Conducting Polymer Electrolyte

<正>1 Results The effect of ammonium nitrate (NH4NO3) content in 40 wt.% PEO and 60 wt.% chitosan blend has been analyzed in this study.The sample containing 40 wt.% NH4NO3 exhibited the highest room temperature conductivity.In order to ascertain that water does not influence the conductivity,the samples were dried in a dessicator and the conductivity determined daily until it shows a constant value.Results are as shown in Fig.1.Samples containing other salt concentrations were also kept in the dessicator for the same number of days.The conductivity for all samples were again determined after 80 days of storage Fig.2.The highest room temperature conductivity value was ≈10-7 S·cm-1 for the sample containing 40 wt.% NH4NO3.The conductivity-temperature relationship was found to obey Arrhenius Rule.From Jonscher Power Law,the trend of s versus temperature showed that the conduction mechanism of the ions in the prepared sample can be explained by the overlapping large polaron tunneling model (OLPT).Transport parameters that is the number density of mobile ions n,mobility,μ and diffusion coefficient,D was calculated using the Rice and Roth model.The dependence of n and μ on temperature is also explained.