Wideband microwave absorbing materials synthesized by Carbonized Peanut-shell combined with ferroferric oxide

Deriving PC materials through biomass sources is a sustainable, ubiquitous, and low-cost method, which comes with many desired features, such as hierarchical texture, periodic pattern, and some unique nanoarchitecture. Herein, a new strategy of using Peanuts as Honeycomb-like carbon precursors and Fe3O4 as magnetic precursor to prepare excellent performance absorbing materials. During the carbonization process, the Peanut-shell changes into the interconnected Honeycomb-like porous carbon materials, and the precursor ferric salt converts into magnetic Fe3O4 nanoparticles. As a result, the obtained MA materials P-C-800@Fe3O4(1:0.5) exhibit outstanding MA performance. When the ration reaches at 4:6, it displays the minimum reflection Loss(RL) of -59.2 dB at 3.36mm, and the effective absorption bandwidth (RL<-10 dB) can reach 7.5 GHz(from 9.5 to 17 GHz) at 2.0 mm. The honeycomb-like composite materials, interfacial polarization, synergistic enhancement between dielectric loss and magnetic loss, multiple reflections, and scatterings make enhancement to the MA capability. This paper might provide an effective and facile strategy to prepare magnetic honeycomb-like porous carbon derived from biomass for MA applications.