Enhanced microwave performance of highly ordered mesoporous carbon coated by Ni2O3 nanoparticles

Electromagnetic and microwave absorbing properties of the ordered mesoporous carbon (OMC) doped by Ni2O3 nanoparticles absorber was investigated for the first time. A minimum reflection loss (RL) value of −39 dB at 10.9 GHz and a broad absorption band with the RL values under −10 dB is obtained in the whole Ku-band and X-band when the thickness is 2.0 mm and 2.8 mm, respectively. It showed far more excellent microwave absorbing properties with respect to undoped Ni2O3 OMC/paraffin composite. This phenomenon could be attributed to the strong cooperative effect between Ni2O3 and OMC.

It was interesting to find that Ni/OMC/paraffin shows much higher microwave absorption than OMC/paraffin without doping Ni2O3 due to the strong cooperation effect between Ni2O3 nanoparticles and OMC nanorods.Figure optionsDownload as PowerPoint slideHighlights
► Microwave absorbing properties of Ni/OMC/paraffin absorber was investigated for the first time.
► A minimum reflection loss value of −30 dB at 10.9 GHz was obtained with the thickness of 2.5 mm.
► A broad absorption band with the RL values under −10 dB was obtained in the whole Ku-band and X-band.
► Ni-doped composite showed excellent microwave absorption with respect to undoped absorber.
► This could be attributed to the cooperative effects between Ni2O3 and OMC.