Journal
APPLIED PHYSICS LETTERS
Volume 95, Issue 20, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3257371
Keywords
barium compounds; dielectric losses; dielectric materials; dielectric polarisation; electrodes; filled polymers; materials preparation; nanocomposites; nanofabrication; nanoparticles; permittivity; silver; space charge; strontium compounds
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Funding
- NSFC of China [60871044, 50835007]
- National 973-project of China [2009CB623302]
- National Project of International Science and Technology Collaboration [2009DFA51820]
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A nanocomposite was prepared by embedding Ba0.6Sr0.4TiO3 (BST)/silver core/shell nanoparticles (BST@Ag) into polyvinylidene-fluoride (PVDF). Through functionalizing the surface of BST nanoparticles by silver coating, the relative permittivity of composites was significantly increased to 153 at 100 Hz which is 73% higher than that of the composite making of untreated BST nanoparticals. The loss tangent was still low (less than 0.2) when the filler content of BST@Ag was 0.55. Increasing the conductivity of the interlayer between BST and PVDF by silver enhances the space charge polarization and forms a nanocapacitance network through the interparticle junctions connecting the electrodes of sample.
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