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

Keywords: bamboo, micro composite, natural ferrite, reduced graphene oxideAbstract. Reduced graphene oxide/ferrite (rGO/Fe 3 O 4 ) 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 Fe 3 O 4 as magnetic material was synthesized from iron sand using the extraction-milling method. The as-prepared samples rGO/Fe 3 O 4 (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 ( RL m ) value of -12.98 dB at matching frequency ( f m ) 10.15 GHz compared with Fe 3 O 4 ( RL m value of -4.25 dB at f m 10.42 GHz) at a thickness of 2 mm. The rGO/Fe 3 O 4 (3:1 wt.%) microcomposites radar wave absorber shows the best absorption with maximum reflection loss ( RL m ) value of −14.30 dB at matching frequency ( f m ) 10.15 GHz at a thickness of 2 mm. Natural materials and the controlled rGO/Fe 3 O 4 microcomposites structure with simple synthesis methods shows the great potential application in high performance microwave absorbing materials.