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Title: Dielectric properties of poly(vinylidene fluoride) nanocomposites filled with surface coated BaTiO{sub 3} by SnO{sub 2} nanodots

SnO{sub 2} nanoparticles with an average diameter of about 4 nm were coated on the surface of BaTiO{sub 3} (BT) (∼100 nm) by chemical treatment. With the introduction of BT@SnO{sub 2}, the dielectric permittivity of poly(vinylidene fluoride) (PVDF) composite was significantly increased to 90 at 10{sup 3} Hz, which is ∼40% higher than that of the BT/PVDF composites. It was attributed to the enhanced interfacial polarization in the interlayers between BT and PVDF due to the addition of SnO{sub 2} nanodots. The distance of SnO{sub 2} nanodots on the adjacent BT surfaces is close enough for the electron transport in the matrix by tunneling effect. Besides, the semiconductive SnO{sub 2} leads to the weak insulating-conducting transition close to the percolation threshold.
Authors:
; ; ;  [1] ;  [2]
  1. Laboratory of Dielectric Polymer Materials and Devices, Department of Polymer Science and Engineering, University of Science and Technology Beijing, Beijing 100083 (China)
  2. Department of Physics and Materials Science, City University of Hong Kong, Kowloon, Hong Kong (China)
Publication Date:
OSTI Identifier:
22283103
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 7; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 77 NANOSCIENCE AND NANOTECHNOLOGY; BARIUM COMPOUNDS; COMPOSITE MATERIALS; ELECTRIC CONDUCTIVITY; ELECTRONS; FLUORINATED ALIPHATIC HYDROCARBONS; PERMITTIVITY; POLARIZATION; POLYVINYLS; QUANTUM DOTS; SURFACES; TIN OXIDES; TITANATES; TUNNEL EFFECT