A reduced graphene oxide/bi-MOF-derived carbon composite as high-performance microwave absorber with tunable dielectric properties

摘要

In this paper, a reduced graphene oxide/bi-MOF-derived carbon (RGO/bi-MDPC) composite is studied as high-performance microwave absorber with tunable dielectric properties. The dielectric parameter of the RGO/bi-MDPC could be optimized by changing annealing temperature. The optimal sample presents the excellent microwave absorbing performance with the effective absorption bandwidth covering the whole X band with a thickness of 3.4 mm while the minimum reflection coefficient reaches - 33.8 dB at 8.8 GHz with the thickness of 3.7 mm. The specific porous structure, residual oxygen functional groups, and abundant interface contribute to enhanced microwave absorption performance. This work indicates that the bi-MOF-derived porous carbon could be used as nanostructured phase to improve the microwave absorptive capacity of RGO composites.