Giant permittivity of three phase polymer nanocomposites obtained by modifying hybrid nanofillers with polyvinylpyrrolidone. Issue 1 (2nd January 2018)

• Record Type: Journal Article
• Authors: Lakshmi, N. V.; Tambe, Pankaj; Sahu, Niroj Kumar
• Is Part Of: Composite interfaces. Volume 25:Issue 1(2018)
• Page Start: 47
• Page End: 67
• Publication Date: 2018-01-02
• Subjects: Graphene -- Quantum Dots -- PVDF -- Nanocomposites; Composite materials -- Periodicals; 620.11805
• DOI: 10.1080/09276440.2017.1338876
• Languages: English
• ISSNs: 0927-6440

Abstract

Abstract: In this work, the combination of graphene decorated with graphene quantum dots (G-D-GQDs) and barium titanate (BaTiO3 ) nanoparticles filled poly (vinyledene fluoride) (PVDF) nanocomposites are prepared using solvent casting method. The modification of G-D-GQDs and BaTiO3 nanoparticles with polyvinyl pyrrolidone (PVP) show finer dispersion in PVDF matrix as compared to unmodified G-D-GQDs and BaTiO3 nanoparticles in PVDF matrix. XRD of PVDF nanocomposites shows the formation of α and β form of PVDF crystals. The incorporation of the combination of PVP modified BaTiO3 nanoparticles and G-D-GQDs in PVDF matrix show a decrease in crystallization temperature ( T c ), percent crystallinity ( X c ) and increase in thermal stability as compared to unmodified PVDF/BaTiO3 /G-D-GQDs nanocomposites, due to interaction of PVP modified nanoparticles with PVDF. Further, the incorporation of the combination of 20 wt.% BaTiO3 nanoparticles and 3 wt.% G-D-GQDs in PVDF matrix show a giant dielectric constant. The giant dielectric constant is achieved due to accumulation of more charges across conductor-insulator interface, more numbers of microcapacitor formed and enhanced interfacial compatibility between BaTiO3 /G-D-GQDs with PVDF through PVP. The loss tangent (tan δ ) of PVP modified G-D-GQDs and BaTiO3 nanoparticles and its PVDF nanocomposites is low due to lower leakage current, which make the material suitable for various applications. Graphical Abstract: