Transport, EMISE and Humidity Sensing studies of Polyaniline-Cobalt Ferrite Nanocomposites

Abstract

Polyaniline-CoFe2O4 nanocomposite thin films and pellets were prepared by incorporating varying amounts of CoFe2O4 in the matrix of polyaniline (PANI) through an in-situ polymerization technique. Morphology of the composites were examined using SEM, XRD studies exhibited crystalline nature of the composites and FTIR analysis revealed cobalt ferrite was homogeneously mixed in the matrix of PANI. AC Conductivity, dielectric and electric modulus studies exhibited the regular behavior of PANI composites were studied in the range 10 Hz – 7 MHz Thin films of PANI- CoFe2O4 nanocomposites when exposed to a broad Frequency range: 2–3 GHz. showed electromagnetic interference in the range of -4 dB to -9 dB, indicating effective attenuation of electromagnetic energy and serving as evidence for EMI shielding. PANI has a more efficient conducting mechanism in CoFe2O4-PANI composites, according to conductivity experiments. The humidity sensitivity experiment revealed a variation in resistance in response to relative humidity when the pellets were exposed to a broad humidity range from 11% to 97% RH.