The broadband dielectric properties of the onion-like carbon (OLC) and polyurethane based composites of different compositions are presented for the frequency range of 20 Hz–3 GHz and 250–450 K temperatures. It is shown that an abrupt increase in the complex dielectric permittivity at the volume fraction of OLC 10% is associated with the onset of percolation. The revealed critical exponent and percolation point reasonably agree with theoretically predicted values. Composites with 10% of OLC exhibit dielectric permittivity as high as 2000 and conductivity as high as 0.01 S/m at 100 Hz.
High dielectric permittivity of percolative composites based on onion-like carbon
J. Macutkevic, D. Seliuta, G. Valušis, J. Banys, V. Kuznetsov, S. Moseenkov, O. Shenderova; High dielectric permittivity of percolative composites based on onion-like carbon. Appl. Phys. Lett. 14 September 2009; 95 (11): 112901. https://doi.org/10.1063/1.3224187
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