3D graphene–Fe3O4 nanocomposites with high-performance microwave absorption

Abstract

3D Fe3O4-graphene nanocomposites were conveniently prepared via a direct hydrothermal grafting method. On the basis of the unique properties of both single-crystalline Fe3O4 and 3D chemically reduced graphene oxide, with characteristics such as ultralow density and high surface area, the as-prepared graphene-Fe3O4 nanocomposites showed high-performance microwave absorption ability and have the potential for application as advanced microwave absorbers.

Fe3O4 nanoparticles decorated on a CuS platelet-based sphere: a popcorn chicken-like heterostructure as an ideal material against electromagnetic pollution

“…A variety of studies have been devoted to the synthesis of EA materials to obtain EA materials having properties such as strong absorption capability, wide effective absorption bandwidth, high thermal stability, lightweightedness, and anti-oxidation. [6][7][8] With the development of technology, various strategies have been explored to synthesize functional materials to achieve better EA performance; these materials include metal oxides or suldes, such as ZnO, 9 CoFe 2 O 4 , 10 SnO 2 , 11 CoS, 12 and CuS 13-15 as well as carbon materials such as carbon nanotubes (CNTs), 16,17 graphene or reduced graphene oxide (RGO), 18 carbon bers (CFs), 19 and/or their hybrids. 20,21 Among the many existing materials, heterostructures of magnetic loss-type and dielectric loss-type materials produce great enhancement in EA performance; these materials include Fe 3 32 graphene CuS, 33 and CuS/ ZnS.…”

Three-dimensional (3D) α-Fe2O3/polypyrrole (PPy) nanocomposite for effective electromagnetic absorption

“…16 The three-dimensional reduced graphene oxide (3D-RGO) aerogel has been researched deeply as EA materials. 17,18 However, the reported methods for the synthesis of graphene aerogel have some disadvantages such as low-yield and complex manipulations, which limited its further application. Alternatively, conducting polymer aerogels (CPAs), combinations of conducting polymer and aerogels, have 3D-microstructured frameworks and can be produced in large scale.…”

Direct mapping of the electric permittivity of heterogeneous non-planar thin films at gigahertz frequencies by scanning microwave microscopy

“…The emergence of the new 3D electron device technologies (e.g. 3D transistors FinFET 25 and 3D NAND memories 26 ) and of new 3D functional nanomaterials 27,28,29 is prompting for a resolution of the above mentioned challenge. 30 The major issue posed by non-planar heterogeneous systems is that the measured microwave signal shows contributions due to both changes in the sample topography and changes in the local electric permittivity properties, whose disentanglement is rather complex.…”