Electromagnetic and microwave-absorbing properties of highly ordered mesoporous carbon supported by gold nanoparticles

Electromagnetic (EM) and microwave absorbing properties of highly ordered mesoporous carbon (OMC) supported by ultra-fine gold nanoparticle absorber was investigated for the first time. A minimum reflection loss (RL) value of -32 dB at 9.7 GHz and a broad absorption band with the RL values under -10 dB was obtained in the whole Ku-band and X-band when the thickness was 2.0 mm and 2.8 mm, respectively. Au-doped OMC/paraffin composite showed far more excellent microwave absorbing property with respect to undoped absorber. This could be attributed to the promotion effects of Au nanoparticles on better impedance match between absorber and air. (C) 2012 Elsevier B.V. All rights reserved.