Nickel/carbon hybrid nanostructures as microwave absorbers

Magnetic metal/carbon hybrid nanostructures are novel materials having multifunctional properties. Here we report the microwave absorbing properties of nickel/carbon nanostructures synthesized by a controlled pyrolysis method. Their complex dielectric permittivity and magnetic permeability were measured at different microwave frequencies using the technique of cavity perturbation. Reflection losses were evaluated and found to be less than -10 dB over the entire X-band (8-12 GHz) for a thickness of 2.2-2.8 mm. A minimum reflection loss of -45 dB was attained for an absorber thickness of 6.6 mm at 3.13 GHz. (C) 2010 Elsevier B.V. All rights reserved.