Synthesis and Electromagnetic Wave Absorption Properties of Micro Composites Reduced Graphene Oxide/Ferrite Based Dendrocalamus Asper Charcoal and Natural Ferrite

Reduced graphene oxide/ferrite (rGO/Fe3O4) micro composites as radar absorber materials have been successfully synthesized from Petung bamboo (Dendrocalamus Asper) and iron sand using a mechanical mixing method. Reduced graphene oxide (rGO) as dielectric material was synthesized from Petung bamboo charcoal using the carbonization method, and Fe3O4 as magnetic material was synthesized from iron sand using the extraction-milling method. The as-prepared samples rGO/Fe3O4 (1:1, 1:2, 1:3, 2:1, 3:1 wt%) was made by dry mixing and mechanically pressed. Magnetics and morphology of samples were characterized by vibrating sample magnetometry (VSM) and scanning electron microscopy (SEM). Microwave absorption was measured using a vector network analyzer (VNA) at 8 – 12 GHz. The results of measurement by using VNA showed that at the micro-scale, rGO had a higher absorption power with maximum reflection loss (RLm) value of-12.98 dB at matching frequency (fm) 10.15 GHz compared with Fe3O4 (RLm value of-4.25 dB at fm 10.42 GHz) at a thickness of 2 mm. The rGO/Fe3O4 (3:1 wt.%) microcomposites radar wave absorber shows the best absorption with maximum reflection loss (RLm) value of −14.30 dB at matching frequency (fm) 10.15 GHz at a thickness of 2 mm. Natural materials and the controlled rGO/Fe3O4 microcomposites structure with simple synthesis methods shows the great potential application in high performance microwave absorbing materials.