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Enhanced dielectric properties and suppressed leakage current density of PVDF composites flexible film through small loading of submicron Ba0.7Sr0.3TiO3 crystallites

  • Pallavi Gupta
  • Ashok Kumar
  • Monika Tomar
  • Vinay Gupta
  • Dwijendra P. SinghEmail author
Article
  • 304 Downloads

Abstract

Ba0.7Sr0.3TiO3 (BST) crystallites prepared by sol–gel technique are incorporated into poly(vinylidene fluoride) PVDF matrix by solution casting technique. Cuboid shape of crystallite has been confirmed by high resolution transmission electron microscopy. PVDF composite films exhibit high dielectric constant and very low leakage current density. The dielectric constant ~22 (at 1 kHz) has been obtained for composites containing 11 vol% of BST crystallite; which is ~3 times higher than the dielectric constant of the pure PVDF (~7.9). Moreover, the leakage current density with same loading of BST crystallite increased only by one order (i.e. 10−7Amp/cm2 for pure PVDF to 10−6Amp/cm2). The observed value of leakage current density is very small as compared to earlier reports. The dielectric loss was found to be 0.02–0.03 at 1 kHz, which is also very small. The improved dielectric behavior is attributed to the improved interface between PVDF and BST crystallite and, the suppressed leakage current density might be arising due to smaller conducting pathways at interface.

Keywords

PVDF Dielectric Loss High Resolution Transmission Electron Microscopy High Dielectric Constant Leakage Current Density 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

Pallavi Gupta is grateful to the University Grant Commission (UGC) for providing fellowship to complete this work.

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Copyright information

© Springer Science+Business Media New York 2017

Authors and Affiliations

  • Pallavi Gupta
    • 1
  • Ashok Kumar
    • 2
  • Monika Tomar
    • 3
  • Vinay Gupta
    • 4
  • Dwijendra P. Singh
    • 1
    Email author
  1. 1.School of Physics and Materials ScienceThapar UniversityPatialaIndia
  2. 2.CSIR-National Physical LaboratoryNew DelhiIndia
  3. 3.Department of PhysicsUniversity of DelhiDelhiIndia
  4. 4.Department of Physics and AstrophysicsUniversity of DelhiDelhiIndia

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