Enhanced dielectric properties of green synthesized Nickel Sulphide (NiS) nanoparticles integrated polyvinylalcohol nanocomposites

• Published in: Materials research express 2020-06, Vol.7 (6), p.64007
• Main Authors: Reddy, P Lokanatha, Deshmukh, Kalim, Kovářík, Tomáš, Reiger, David, Nambiraj, N Arunai, R, Lakshmipathy, S K, Khadheer Pasha
• Format: Article
• Language: English
• Subjects: dielectric properties; green synthesis; morphology; NiS NPs; PVA composites; thermal behaviour
• ISSN: 2053-1591; 2053-1591
• DOI: 10.1088/2053-1591/ab955f

A green synthesis approach has been adopted to prepare nickel sulphide nanoparticles (NiS NPs) using banana peel extract (BPE) as a reducing and capping agent. Polyvinyl alcohol (PVA)/NiS nanocomposite films were fabricated using a cost-effective solution casting technique by dispersing different contents of NiS NPs (0–3 wt%) in the PVA matrix. Various characterization techniques were employed to analyze the structural, thermal and morphological properties of the PVA / NiS nanocomposite films. Further, the dielectric behaviour of these nanocomposite films was investigated at frequency range 50 Hz–20 MHz and in the temperature range 40 °C–140 °C. Also, there exists a significant interaction between the polymer matrix and the nanofiller as evident from the notable improvement in the dielectric properties of the nanocomposites. The dielectric constant ( ε ) value of PVA/NiS nanocomposite film with 3 wt % NiS NPs loading was found to be 154.55 at 50 Hz and at 140 °C which is 22 times greater than the dielectric constant value of neat PVA (6.90). These results suggest that NiS NPs were dispersed homogeneously in the PVA matrix.