Frequency dependence of AC conductivity and dielectric properties evaluation of in-situ prepared polyaniline/manganese dioxide composite

• Published in: Journal of materials science. Materials in electronics Vol. 31; no. 9; pp. 7226 - 7231
• Main Authors: Kulakarni, Yankappa A., Jagadeesh, M. R., Jambaladinni, Sahebagouda, Kumar, H. M. Suresh, Vasanthkumar, M. S., Shivakumara, S.
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.05.2020; Springer Nature B.V
• Subjects: Aniline; Characterization and Evaluation of Materials; Chemistry and Materials Science; Conductivity; Dielectric properties; Fourier transforms; Frequency ranges; Infrared spectroscopy; Manganese dioxide; Materials Science; Nanocomposites; Nanostructure; Optical and Electronic Materials; Polyanilines; Polymers; Potassium permanganate; Scanning electron microscopy; X ray powder diffraction
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-020-03295-w

In the present study, polyaniline/manganese dioxide (PANI/MnO 2 ) nanocomposite has been synthesised by in-situ redox method. MnO 2 nanostructures are formed in PANI matrix via simple redox reaction between KMnO 4 and aniline monomer at ambient conditions. The composite formation, structural and morphological changes in MnO 2 and PANI/MnO 2 were characterised by Fourier transform infrared spectroscopy (FT-IR), powder X-ray diffraction (PXRD) and scanning electron microscopy (SEM) analysis. The PXRD and FT-IR patterns of the PANI/MnO 2 nanocomposites confirm the presence of ⍺ -MnO 2 nanostructures in polymer matrix. SEM images of the composite showed that MnO 2 nanostructures were dispersed uniformly in polymer matrix. AC conductivity and dielectric properties of MnO 2 nanostructures and PANI/MnO 2 nano composite were studied in the frequency range 10–100 MHz. AC conductivity of the nano composite obeyed the power law indicating the universal behaviour of disordered structures.