Growth of Fe₃O₄ Nanorod Arrays on Graphene Sheets for Application in Electromagnetic Absorption Fields

Abstract

A facial strategy is developed to fabricate a three-dimensional (3D) Fe3 O4 nanorod array/graphene architecture, in which Fe3 O4 nanorods with a length and diameter of about 600 and 100 nm, respectively, are grown on both surfaces of the graphene sheets. The measured electromagnetic parameters show that the 3D architecture exhibits excellent electromagnetic wave-absorption properties, that is, more than 99 % of electromagnetic wave energy can be attenuated by the 3D architecture if it is added in only 20 wt % of the paraffin matrix, as the thickness of the absorber is in the range from 2.38 to 5.00 mm. The analysis of the electromagnetic (EM) absorption mechanism reveals that the excellent EM absorption properties are related to the special 3D architecture, and therefore, the construction of graphene-based 3D heteronanostructures is effective in obtaining lightweight EM absorbers with strong absorption properties.

Enhanced microwave absorption properties and mechanism of core/shell structured magnetic nanoparticles/carbon-based nanohybrids

“…One can find that the obtained C-600 has much more semicircles than that of C-400, which indicating that the interface polarization also plays an important role in the enhanced microwave absorption properties. Generally, similar to the recently reported mechanisms [65][66][67], because of the tube structure, good ferromagnetic properties of α-Fe and core/shell structured nanohybrids, the obtained C-500 and C-600 here exhibit the excellent mutual compensation between dielectric loss and magnetic loss, the effective offsetting the drawbacks between attenuation constant and impedance matching, the partial geometric effect and interface polarization, which can favor the enhanced attenuation of EM wave.…”

Preparation of flexible reduced graphene oxide/poly(vinyl alcohol) film with superior microwave absorption properties

“…6a, the pure PVA has very weak EM absorption property at every sample thickness except for nearly 18 GHz. Compared with previous reports such as ternary BaTiO3/MWNT/PBO, 39 CMK-3/PMMA composites, 40 Fe3O4/Al2O3/CNCs, 3 rGO/α-Fe2O3, 21-23 PVDF/GO, 12 RGO/CuS/PVDF, 20 rGO/Fe3O4, [24][25][26] rGO/ZnO hollow sphere 28 and C-RG/PEO, 16 asprepared rGO/PVA films perform a better EM wave absorption. 6b and c we can find that when GO was added into PVA, the values of RL was dramatically improved.…”

“…7 Wang et al have fabricated GO/CNT-Fe3O4 composites by using a one-pot co-precipitation in-situ growth route and found that the composite took on both dielectric loss and magnetic loss. 20 composites, such as rGO/α-Fe2O3, 21-23 PVDF/GO, 12 rGO/Fe3O4, [24][25][26][27] and rGO/ZnO hollow sphere 28 are reported for EM absorbing. The RCmin of composites can reach -55 dB; while the effective absorption bandwidth reaches 3.5 GHz in X-band when the filler loading is 5 wt.% and thickness of absorber is 2.75 mm.…”

Hydrophobic graphene nanosheets decorated by monodispersed superparamagnetic Fe3O4 nanocrystals as synergistic electromagnetic wave absorbers

“…[21][22][23][24] Graphene promises to be a superior building block for constructing electromagnetic wave absorbers, owing to its remarkable physical properties including large surface area, high electrical conductivity, good thermal conductivity, flexibility and strong mechanical stiffness. [38][39][40][41][42][43][44][45][46][47][48][49][50] However, magnetic nanocrystals supported on graphene are generally aggregated with uneven distribution, leading to possible ''dead areas'' with null magnetic components. [26][27][28][29] In particular, taking advantage of the combined benefits of magnetic nanocrystals and conductive graphene, magnetic nanocrystals-graphene hybrids show great potential as novel light-weight electromagnetic absorption materials.…”