Enhancement investigations on dielectric and electrical properties of niobium pentoxide (Nb2O5) reinforced poly(vinylidene fluoride) (PVDF)- graphene oxide (GO) nanocomposite films. Issue 3 (3rd July 2021)

• Record Type: Journal Article
• Authors: Moharana, Srikanta; Mahaling, Ram Naresh
• Is Part Of: Journal of Asian ceramic societies. Volume 9:Issue 3(2021)
• Page Start: 1183
• Page End: 1193
• Publication Date: 2021-07-03
• Subjects: Nb2O5 -- graphene oxide -- poly(vinylidene fluoride) -- nanocomposite -- dielectric properties; Ceramics -- East Asia -- Periodicals; Materials science -- Periodicals; 620.1405
• DOI: 10.1080/21870764.2021.1946270
• Languages: English
• ISSNs: 2187-0764

Abstract

ABSTRACT: An ultra high dielectric constant nanocomposites comprising of poly(vinylidene fluoride) (PVDF) as a polymer matrix and niobium pentoxide (Nb2 O5 )-reinforced graphene oxide (GO) have been successfully developed using solution casting technique. Scanning electron microscopy (SEM) demonstrates that the homogeneous dispersion of Nb2 O5 and GO within the PVDF matrix was realized. The dielectric and electrical properties of the resulting PVDF-GO-Nb2 O5 nanocomposite films as a function of frequency were studied. The dielectric constant of the nanocomposites system reached a value of about ≈140 at 100 Hz, with a relatively low dielectric loss factor (≈ 1.4). The enhanced dielectric performance of the PVDF-GO-Nb2 O5 nanocomposites was ascribed to the presence of Nb2 O5 onto the GO, which exhibits strong interaction between GO and PVDF matrix through hydrogen bonding. Moreover, the experimental results fit well with percolation theory and near the percolation threshold (fc < 2 wt %) with high dielectric constant was achieved for PVDF-GO-Nb2 O5 nanocomposites. Furthermore, the AC electrical conductivity was also noticeably enhanced. Our strategy provides a facile method to prepare high dielectric constant and relatively low dielectric loss PVDF-GO-Nb2 O5 nanocomposite films that might be suitable for energy storage applications.