Preparation, Structural, Electrical and LPG Sensing Properties Study of Magnesium Oxide Doped Polyaniline Composite (PNMGO)

Abstract

The in-situ polymerization process is used to prepare the composites of polyaniline (Pn) and magnesium oxide doped polyaniline (PnMgO), with ammonium persulphate acting as an oxidizing agent. Magnesium oxide has been added in different amounts to prepare a variety of composites. All of the synthesized samples' phases and morphologies were examined utilizing fundamental characterization methods like scanning electron microscopy (SEM) and X-ray diffraction (XRD). Using the impedance approach, the samples' AC electrical conductivity was determined at room temperature throughout a frequency range of 10 KHz to 1MHz. Furthermore, the composites dc electrical transport property was examined throughout a 30-2000C temperature range. The dc electrical conductivity of the PnMgO composites increased as the temperature and MgO concentration in polyaniline increased. For every composition, the activation energies were calculated using Arrhenius plots. As the concentration of MgO in the polyaniline matrix increased, the activation energy decreased. When the amount of MgO was increased, the electrical conductivity improved, but the activation energy of the obtained PnMgO composites dropped when compared to the activation energy of a Pn. When Pn and PnMgO composites were subjected to 1000 ppm and 2000 ppm concentrations of LPG gas, the electrical resistance of each material changed. When exposed to LPG gas, both samples showed a quick change in resistance, although the PnMgO composite was more sensitive and appropriate for LPG sensing than the Pn sample.

Keywords

• Polyaniline (Pn), Magnesium oxide (MgO), LPG sensing, AC, DC, Activation energy, XRD, SEM