Structural and bonding properties of honeycomb structure of composite nanoparticles Fe₃O₄ and activated carbon

Magnetite nanocomposite synthesis and activated carbon with the addition of polyvinyl alcohol (PVA) as an absorber of electromagnetic waves have been successfully carried out with variations in the thickness of 4 mm, 6 mm, 8 mm, and 10 mm. Characterization was carried out with XRD (X-Ray Diffraction), XRF (X-Ray Fluorescence), FTIR (Fourier Transform Infrared) and VNA (Vector Network Analyzer) with a working frequency of 3 GHz - 7.5 GHz. XRD characterization controls the formation of magnetite (Fe₃O₄) and determines the crystal size. The diffraction peaks of the absorber at (221), (331) and (440) with a size of crystal on 10.46 nm. Characterization of XRF shows the chemical composition of the absorber which indicates the formation of nanocomposites, FT-IR spectrum obtained by C = C alkene bond and C-H alkane derived from activated carbon, honeycomb paper and magnetite (Fe₃O₄). According to the data, it contributes to the formation of molecular bonds from nanocomposite absorber. Characterization of VNA was obtained by the best absorber with reflection loss value of -16.24 dB, the frequency of 5.77 GHz at a thickness of 10 mm. (paper)