Dielectric and impedance spectroscopic analysis in SNP-d embedded PTh nano rods for energy storage applications

摘要

The heterogeneity and the formation of interfaces between components of a nanocomposite material are important in enhancing the dielectric properties. Na[Fe(CN)(4)(C3H4N2)NO]2H(2)O (SNP-d, the Imidazole derivative of Sodium Nitroprusside) embedded Polythiophene (PTh) nano rods have been prepared by chemical oxidative polymerization method, which is successfully characterized by FTIR, SEM and TEM measurements. Thermogravimetric analysis revealed enhanced thermal stability of PTh/SNP-d nanomaterial as compared to pure PTh. Apparent colossal dielectric constant (CDC) of around similar to 2 x 10(3) in the higher frequency range (10 MHz) at room temperature has been observed. This is owing to the extrinsic (interfacial effects) in addition to intrinsic (bulk) contributions. Heterogeneity in the material paves way for Maxwell-Wagner interfacial effect which is justified by modulus and impedance spectroscopy. The material behaves a non-ideal layered dielectric consisting of a series combination of parallel RC elements. As the nanomaterial shows CDC, a high capacitive effect can therefore be displayed for energy storage applications.