Davin Alana Putra, Wida Puteri Agista, Ulfawanti Intan Subadra, Sunaryono, Erfan Handoko, Mudrik Alaydrus, Nur Ezaan Khamsan, Ahmad Taufiq
This research has successfully synthesized Fe3O4/SWCNT/TiO2 nanocomposite as a radar absorber for stealth technology applications in the Ka-band. The study aimed to investigate the nanocomposite's crystal structure, morphology, functional groups, magnetic properties, and radar absorption performance at a frequency Ka-Band range from 26.5 GHz to 40.0 GHz. The X-ray diffraction analysis revealed a crystalline phase of Fe3O4 with a crystallite size of 14.26 nm and two crystalline phases of TiO2 (anatase and rutile) with crystallite sizes of 5.12 nm and 27.51 nm, respectively. The scanning electron microscopy image showed SWCNT as a matrix with diameters of several nanometers and lengths of several micrometers, along with Fe3O4 and TiO2 particles as fillers with a particle size of 46.56 nm, consistent with the XRD characterization. Furthermore, the infra-red spectrum confirmed the presence of Fe3O4 through octahedral and tetrahedral Fe-O bonds. C-O, C-C, and C=O indicated the presence of SWCNT. Meanwhile, -OH bonds also validated the success of their functionalization. Ti-O and Ti-O-C bonds stated the presence of TiO2 bound to SWCNTs. The hysteresis curve exhibited superparamagnetic properties of the nanocomposite with a saturation magnetization of 9.38 emu/g. Furthermore, radar absorption measurement demonstrated that the nanocomposite absorbs radar with a maximum reflection loss of –1.51 dB at an effective frequency of 33.16 GHz, showing a potency for Fe3O4/SWCNT/TiO2 nanocomposite as radar absorber in the Ka-Band Region, inspiring potential applications in stealth technology. © 2025 Trans Tech Publications Ltd, All Rights Reserved.
Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Indonesia; Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Jakarta, Indonesia; Department of Electrical Engineering, Universitas Mercu Buana, Indonesia; Laser Center, Ibnu Sina Institute for Scientific and Industrial Research, Universiti Teknologi Malaysia, Malaysia
