Electrical response of PVDF/BaTiO3 nanocomposite flexible free-standing films

Jaffari G. H., Shawana H., Mumtaz F., CAN M. M.

Bulletin of Materials Science, vol.46, no.4, 2023 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 46 Issue: 4
  • Publication Date: 2023
  • Doi Number: 10.1007/s12034-023-03059-2
  • Journal Name: Bulletin of Materials Science
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Chemical Abstracts Core, Communication Abstracts, Compendex, INSPEC, Metadex, Civil Engineering Abstracts
  • Keywords: dielectric properties, ferroelectricity, Polymers, sol–gel growth, X-ray diffraction
  • Istanbul University Affiliated: Yes

Abstract

PVDF and PVDF/BaTiO3 nanocomposite films are studied in the present work. BaTiO3 (BTO) nanoparticles have been synthesized using a cost-effective sol–gel method, while free-standing PVDF/BaTiO3 nanocomposite films with varying BaTiO3 content have been prepared using the solvent casting technique. Phase identification has been carried out using the X-ray diffraction technique. The direct bandgap of all films was calculated using the Kubelka–Munk (KM) function. Two distinct peaks were observed in KM function vs. energy plots for PVDF/BTO nanocomposite films corresponding to PVDF and BaTiO3. An increase in the magnitude of the dielectric constant is observed in PVDF/BaTiO3 nanocomposite films compared to pure PVDF. Room temperature ferroelectric response is studied at two different frequencies of 10 and 400 Hz. Non-saturated ferroelectric loops are observed in PVDF and PVDF/BTO films, indicating the lossy capacitor behaviour. An increase in maximum polarization is observed with the addition of BTO nanoparticles, attributed to interfacial effects and interactions between nanoparticles.