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Polyvinyl alcohol (PVA), polystyrene sulfonic acid (PSSA), and cobalt oxide (Co 3 O 4 ) nanoparticles are used in the ease and low-cost solution casting method to prepare flexible nanocomposite films. Structural and morphological studies were carried out for the nanocomposites. Fourier transform infrared (FTIR) spectroscopy and X-ray diffraction (XRD) studies revealed an excellent interaction between the host polymer and Co 3 O 4  nanoparticles. Scanning electron microscopy (SEM) was employed to study the surface morphology of the PVA/PSSA/Co 3 O 4  nanocomposite films, which exhibited homogeneous dispersion of nanoparticles within the host matrix. Stress–strain curves were obtained to evaluate the mechanical properties of PVA/PSSA/Co 3 O 4  nanocomposite films. The dielectric behavior of PVA/PSSA/Co 3 O 4  nanocomposite films was examined by varying the content of Co 3 O 4  nanoparticles in the frequency and temperature range of 100 Hz–1 MHz and 30–150°C, respectively. The 15 wt% of Co 3 O 4  nanoparticles in the PVA/PSSA/Co 3 O 4  nanocomposite films have a high dielectric constant (ɛ) of 511.66 and a relatively high dielectric loss (tan δ) of 1440.25 at low frequency and at 60°C, respectively. In addition, the high AC conductivity (σ ac ) obtained for the 15 wt% of Co 3 O 4  nanoparticles was found to be 1.66 × 10 −5  Scm −1 . The improvement in the dielectric performance of PVA/PSSA/Co 3 O 4  nanocomposite films evidenced that they could be promising materials for microwave absorption applications.

Frequency and temperature dependent dielectric properties of polyvinyl alcohol/polystyrene sulfonic acid/cobalt oxide nanocomposite films