Journal
APPLIED PHYSICS LETTERS
Volume 93, Issue 18, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3013833
Keywords
barium compounds; carbon nanotubes; dielectric losses; dielectric materials; filled polymers; permittivity
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Funding
- NSF of China [50677002]
- NSF of Beijing City [2083031]
- Ministry of Education of China [20050010010]
- Ministry of Science and Technology of China [2008AA03Z307]
- Program for New Century Excellent Talents in University (NCET)
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A three-phase composite with multiwall carbon nanotube (MWNT) and BaTiO3 particles embedded into polyvinylidene fluoride (PVDF) was prepared. The uniform dispersion of fillers was realized, and the dielectric constant was as high as 151 at 10(2) Hz when the volume fraction of MWNT and BaTiO3 were 0.01 and 0.15, respectively. The BaTiO3-MWNT/PVDF composite with high dielectric constant displayed relatively low dielectric loss and good flexibility due to the low concentrations of MWNT and BaTiO3. The results can be explained by the space charge polarization at the interfaces between the conductor and the insulator and the evolutions of conductive pathway and microcapacitance structure.
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