Spherical porous carbon derived from Ni-DOBDC for ultra-wideband microwave absorption

The microstructure design of new carbon nanomaterials always achieves unimaginable characteristics and performance. In this work, the influence of surface roughness ( Ra ) of porous carbon derived from Metal-Organic-Frameworks (MOFs) with different shapes on impedance matching and effective absorption bandwidth (EAB) has been given special attention. The rod shaped, spherical and sheet-like porous carbon materials are obtained at 700 °C from Ni-BTC, Ni-DOBDC and Ni-BPDC. The Ni-DOBDC-700 spherical porous carbon with a relatively large Ra (290 nm) exhibits excellent absorption performance. The minmium reflection loss ( RL min ) is -20.8 dB at 14 GHz and the EAB can reach at 6.7 GHz (11.1-17.8 GHz) when the thickness is 2.2 mm, which covers the Ku band. The spherical porous carbon, the Ni alloys and NiO particles serves the conduction channel, the sources of magnetic loss and interface polarization, respectively. The radar cross section (RCS) value of Ni-DOBDC-700 is less than -10 dB m 2 within the range of -60° to 60° and the maximum scattering intensity is only -16.5 dB m 2 at the thickness of 2 mm. The results provide a new design strategy for fabricating high performance MAMs with different morophology of MOFs derived carbon materials.