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(a)–(c) TEM images of a self-assembly as-synthesized Fe3O4/OA nanoparticles supported on an ultrathin amorphous carbon-coated TEM grid, graphene with a mean thickness of ∼1 nm, and Fe3O4/graphene nanocomposite, respectively. (d) and (e) SEM images of Fe3O4/graphene nanocomposite, indicating that Fe3O4/OA nanoparticles are self-assembled on graphene with a monolayer superlattice structure; (f) aqueous dispersion of graphene and Fe3O4/graphene nanocomposite. By integrating hydrophobic Fe3O4/OA nanoparticles with hydrophilic graphene, the Fe3O4/graphene nanocomposite can be well dispersed in aqueous media and separated by a small magnet.
Electromagnetic parameters (complex permittivity and permeability) of graphene (a) and (d), Fe3O4/OA nanoparticles (b) and (e), and Fe3O4/graphene nanocomposites (c) and (f). All the measured samples are uniformly mixed with the same weight of wax paraffin.
(a) Dielectric loss factor and (b)magnetic loss factors of Fe3O4 nanoparticles, graphene, and Fe3O4/graphene nanocomposites as a function of frequency at 2–18 GHz.
Numerical simulations of electrical field polarization distributions at 14 GHz for the Fe3O4/graphene hybrid system. (a) Model of self-assembled 15 nm Fe3O4 on 1 nm thick graphene; Electrical field polarization distributions under in-plane (b) and out-plane (c) irradiation directions (arrows indicate the electromagnetic wave direction).
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