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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 (Fe 3 O 4 ) 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 (Fe 3 O 4 ). 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.

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