Structural, Morphology, Transport and Humidity Sensing Properties Study of Calcium Titanate (Catio3) Doped Polyaniline Composite.

Abstract

In the present work, calcium titanate (CaTiO₃) doped polyaniline (PANI) composites (PANI/CaTiO₃) were prepared by chemical oxidative in situ polymerization technique with the ammonium persulphate as oxidising agent. Various composites have been prepared by varying the level of additive material CaTiO₃. The phase and morphology of all the synthesized samples were analyzed using basic characterization techniques such as X-ray diffraction (XRD) and scanning electron microscopy (SEM). The AC electrical conductivity of the samples was measured using the impedance technique within a frequency range of 1KHz to 1MHz at room temperature and found that 50 wt% shows high conductivity compared to other composites. Additionally, the dc electrical transport property of the composites was investigated within a temperature range of 40-200⁰C and found that 50 wt% shows high conductivity compared to other composites. The change in electrical resistance of both PANI and PANI/CaTiO₃ composites was measured when exposed to 10 %Rh to 90 %Rh. Both samples exhibited a rapid resistance change upon exposure to humidity, with the PANI/CaTiO₃ composite demonstrating higher change in resistance and suitability for humidity sensing compared to PANI.