Structural and Electrical Properties of LiClO4 Doped PAni Composite Films

Abstract

Conductive Polyaniline PAni was synthesized chemical oxidative polymerization the chemical route. PAni thus synthesized was in-situ doped with HCl acid and Lithium perchlorate in different weight percentage. PAni and its different doped variant thin films were deposited on plain soda glass and conducting ITO glass using CBD technique. Samples of different configurations are characterized for structural consistency with X-ray, for chemical identification with FTIR, for thermal integration with DSC. Electric measurements such as capacitance and conductance were carried out using LCR bridge and Four Probe arrangements respectively. X-ray analysis divulges largely the polycrystalline nature of PAni and LiClO 4 doped variant. IR study in Fourier transformed mode reveals PAni and its doped variants maintains their structural integrity in good agreement with standard pronounced peaks in the region of 2000-3500 cm-1 , though displaced hydrogen bonds in doped PAni leads to a slight shifting. Significant thermal stability for doped and undoped Polyaniline nearly up to 200 0 C is noted with DSC. Dielectric measurements with variable temperature in the frequency range 50 Hz-2 MHz yields the capacitance variation, confirming the interfacial polarization within the PAni matrix. Lithium Conductivity of 6.19 Sm-1 for lithium perchlorate doped PAni again affirms exitance of bipolarons at greater level of oxidation.