Largely enhanced dielectric properties of TiO2-nanorods/poly(vinylidene fluoride) nanocomposites driven by enhanced interfacial areas. Issue 1 (2nd January 2021)

• Record Type: Journal Article
• Authors: Kum-Onsa, Pornsawan; Chanlek, Narong; Thongbai, Prasit
• Is Part Of: Nanocomposites. Volume 7:Issue 1(2021)
• Page Start: 123
• Page End: 131
• Publication Date: 2021-01-02
• Subjects: TiO2-nanorods -- poly(vinylidene fluoride) -- dielectric permittivity -- loss tangent -- interfacial polarization; Nanocomposites (Materials) -- Periodicals; 620.11805
• DOI: 10.1080/20550324.2021.1952371
• Languages: English
• ISSNs: 2055-0324

Abstract

Abstract: In this work, nanocomposites consisting of TiO2 -nanorods (TiO2 -NRs) with less than 100 nm in size and poly(vinylidene fluoride) (PVDF) were prepared using a liquid-phase assisted dispersion and hot-pressing methods. At 1 kHz and 25 °C, the high dielectric permittivity of ∼66 and loss tangent of ∼0.03 can be obtained in the nanocomposite with a filler volume fraction of 0.5, which was higher than that of a neat PVDF matrix by a factor of 6. Dielectric permittivity of TiO2 -NRs/PVDF nanocomposites not only highly increased with TiO2 -NRs, but also almost independent of the frequency range of 10 2 –10 6 Hz. The significant enhancement in dielectric permittivity is mainly attributed to the interfacial polarization at the interfaces of TiO2 -NRs and PVDF, and semiconducting properties of TiO2 -NRs. Among the various models used for rationalizing the dielectric behavior, the experimental dielectric data is in close agreement with EMT ( n = 0.11) and Yamada models ( n = 8). Graphical Abstract: UF0001