High dielectric permittivity and low percolation threshold in polymer composites based on SiC-carbon nanotubes micro/nano hybrid
2011; American Institute of Physics; Volume: 98; Issue: 3 Linguagem: Inglês
10.1063/1.3544942
ISSN1520-8842
AutoresJinkai Yuan, Weilong Li, Sheng‐Hong Yao, Youqin Lin, Alain Sylvestre, Jinbo Bai,
Tópico(s)Advanced Sensor and Energy Harvesting Materials
ResumoVertically aligned carbon nanotubes (CNTs) were synthesized on SiC microplates. Resultant SiC-CNTs hybrids were further incorporated into poly(vinylidene fluoride) (PVDF) as conductive filler to prepare percolative composites. They exhibited a much low percolation threshold (1.47 vol %), but the dielectric permittivity was enhanced significantly. The largest dielectric permittivity of 8700 was observed in the SiC-CNTs/PVDF composites with 2.3 vol % CNTs at 100 Hz. A microcapacitor model was proposed to explain the obtained results based on the special geometry of the hybrid SiC-CNTs filler.
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