Investigations on structural, optical, and AC conductivity of Polyaniline/Manganese Dioxide nanocomposites

A Polyaniline/Manganese dioxide (PANI/MnO۲) nanocomposite contains five weight percentages of MnO۲. It has been successfully prepared by in situ polymerization. The structural, optical, and conductivity of nanocomposites remain relative to changes with respect to the weight percentage of MnO۲. The structural, morphological, optical, and electrical conductivity investigation of pure MnO۲, pure PANI, and nanocomposites were done with powder XRD, HRTEM, SEM, FT-IR, UV and Impedance spectra. XRD results of the PANI/MnO۲ nanocomposites say that the crystalline structure is converted into a very less crystalline structure due to the incorporation of MnO۲ which is inside PANI chain. The HRTEM and SEM images are confirmed to the nanocomposite formation, morphology studies and also supported to the XRD results. From the optical spectra, MnO۲ nanoparticles have been impressed in the surface of PANI. It works as the compensator in the formation of nanocomposites. UV spectral analysis reveals that the absorption of MnO۲ modifies the absorption wavelength of under visible light in whole range. The absorption wavelength of nanocomposites is ۲۸۸ nm and ۳۳۷ nm. AC electrical conductivity of the prepared nanocomposites from impedance spectroscopy was carried out and compared with pure materials. The AC conductivity of as-prepared nanocomposites has been analyzed in the range of ۲۹۸ K to ۴۲۳ K. The AC conductivity of nanocomposites varies depending upon a change of logarithmic frequency.

کلیدواژه ها:

Conductivity ، nanoparticles ، Polyaniline ، Polymerization ، Surface