Journal
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
Volume 211, Issue 11, Pages 2580-2585Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssa.201431306
Keywords
carbon nanotubes; dielectric permittivity; phosphates; unfired ceramics
Funding
- EU [PIRSES-2012-318617 FAEMCAR, FP7-PEOPLE-2013-IRSES-610875 NAmiceMC]
- European Social Fund under the Global Grant measure (Lithuanian team)
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Composite materials, containing low concentrations of carbon nanotubes (CNTs) of three different diameters and heat-resistant phosphate ceramic as a matrix were prepared by cold-pressing method. Their dielectric properties were studied at room temperature in a wide frequency range (20Hz-1MHz). It was found experimentally and proved theoretically via modeling of the composites as a random capacitor-resistor-diode network that electrical percolation concentration depends significantly on the diameter of the nanoinclusions. The main conclusion is that the best candidate providing both the lower percolation threshold and high absolute values of ac conductivity is thinner carbon nanotubes (in our particular case, 8-15nm).
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