Abstract
MgO nanoparticles were successfully prepared by sol–gel method. Nanocomposites of PANI and MgO have been synthesized using the in situ polymerization method for different concentrations of nano MgO powder. The formation of polymer nanocomposite and changes in the structural and micro structural properties of the materials were investigated by X-ray diffractometry (XRD). The surface morphology of Polypyrrole – MgO nanocomposite was elucidated using Scanning Electron Microscopy. AC conductivity studies of PANI - MgO composites for different wt% show thermally activated behaviour. The conductivity was found to increase with the increase in temperature indicating the semiconducting behavior of all the compositions. Maximum conductivity was observed in 50 wt% of MgO in PANI. On exposure of the composites to LPG, increase in resistance was observed with the increase in gas concentration. Maximum sensitivity for gas sensing was observed in the composite of 50 wt% MgO in Polyaniline.
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