Fe2O3/Fe3O4/PANI/MWCNT nanocomposite with the optimum amount and uniform orientation of Fe2O3/Fe3O4 NPs in polyaniline for high microwave absorbing performance

Oleaster seed-derived activated carbon/ferrite nanocomposite for microwave absorption in the X-band range

“…As stated, the primary source of magnetic losses is the natural resonance resulting from the effect of geometric configuration, and exchange resonance caused by ferromagnetic materials. To compare the dissipating performance of the samples, the attenuation constant (α) is obtained from the following equation Shamsaddin Saeed et al, 2020).…”

GO-decorated chain-like Fe2O3/FeMn2O4 NPs (GO-Fe2O3/FeMn2O4 nanocomposites) with ultrabroad band microwave absorption

“…The RL min reached À20 dB at 10 GHz and for the rest of the band, it was about À12.5 dB. For thicknesses of 2.4 and 3.6 mm, the RL min was below À10 dB (9.8-18 GHz) and (11)(12)(13)(14)(15)(16)(17)(18), respectively. The RL min varied from À13 to À20 dB and the tail of the RL curves changed from À10 to À12.5 dB.…”

“…The trend of reflection loss of S3 is similar to that of S2 (RL was almost constant with a weak peak at the beginning of frequency), with a significant decrement in both reflection loss and bandwidth. Only for the 2.4 mm thick sample was the RL greater than À10 dB for the entire frequency band (8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18). The RL min reached À20 dB at 10 GHz and for the rest of the band, it was about À12.5 dB.…”

“…Nanomagnetic nanoparticles improve the conductivity and permittivity of CNT and GO without being very sensitive to heat. 13,14 Several reports have confirmed that the decoration of CNT and GO with iron oxide/metal oxide hybrid nanoparticles causes superior improvement in the absorption performance of the resulting composite in a broad frequency range. The preparation of heterogeneous hybrid nanoparticles of iron/ manganese oxide (FeMn xÀ2 O x ), in addition to their wide range of applications such as in lithium-ion battery anode materials, catalysts, energy storage, humidity sensors and photocatalysis, facilitate the improvement of the microwave absorption performance of GO and CNTs.…”

Superior microwave absorption ability of CuFe2O4/MWCNT at whole Ku-band and half X-band

“…12 A CNT-MnFe 2 O 4 nanocomposite showed minimum reflection loss as high as −38 dB at 5.7 GHz for an absorber thickness of 5 mm and frequency bandwidth up to 3.59 GHz. 13 So, significant reflection loss and bandwidth have been observed for different composites containing Fe 3 O 4 and CNT. Fe 3 O 4 @SiO 2 /Fe 3 O 4 -UTCNTs samples exhibited a minimum reflection loss of −50.4 dB with an absorption bandwidth of 7.2 GHz for 3 mm sample thickness.…”