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

► Au/OMC/paraffin was successfully prepared by the colloidal deposition method. ► A minimum reflection loss value of −32 dB at 9.7 GHz was obtained with the thickness of 2.8 mm. ► A broad absorption band with the RL values under −10 dB was obtained in the whole Ku-band and X-band. ► Au-doped composite showed excellent microwave absorption with respect to undoped absorber. ► This could be attributed to the promotion effects of Au nanoparticles on impedance match.