Tunable High-Performance Microwave Absorption and Shielding by Three Constituent Phases Between rGO and Fe3O4@SiO2 Nanochains

Abstract

With the aim of achieving high microwave absorption and electromagnetic shielding performance, reduced graphene oxide (rGO) and Fe3O4@SiO2 nanochains are successfully combined at various mass ratios. By selecting the right mass ratio, an rGO/Fe3O4@SiO2 composite with excellent microwave absorption properties is obtained, and, due to the addition of highly conductive rGO, the desired shielding effectiveness is also achieved. The reflection loss (RL) value of the composite can reach −48.34 dB with a mass ratio of 1:1, and the effective bandwidth (<-10 dB) can cover 4.88 GHz at a thickness of 2.0 mm. Moreover, the composite with a mass ratio of 4:1 exhibits outstanding electromagnetic shielding performance, which also broadens its fields of application. This outstanding microwave absorption and electromagnetic shielding performance indicate that the composite can potentially be employed as a multi-functional material.

1D Colloidal chains: recent progress from formation to emergent properties and applications

“…These materials can be in general non-conductive polymers such as PVP and poly(vinylidene fluoride) (PVDF), to enhance polarization losses. 645,701,709–711 Conductive materials including carbon nanotubes, 648,712 carbon nanofibers, 296,642 graphene, 650,713 and polypyrrole, 714 are also commonly used to combine with 1D magnetic colloidal chains to improve their permeability-permittivity matching (Fig. 26b).…”

Microporous Reduced Graphene Oxide Foam Containing Ni(OH)2 Nanoparticles for Broadband Electromagnetic Wave Absorption

“…Microstructural and component design are regarded as two effective methods to ameliorate the impedance matching degree of GO-based materials for improving electromagnetic microwave absorption (EMA) performance. − Both absorption intensity and effective absorption band (EAB) can be well enhanced via constructing GO into aerogel and this special three-dimensional (3D) microstructure can increase multiple internal reflection of incident Ews. , Besides, various magnetic or dielectric fillers can be added into GO matrix composite foams for achieving better EMA property. − Shu et al synthesized nitrogen-doped reduced graphene oxide (RGO) composite and its minimum reflection loss (RL min ) was up to −63.2 dB . Shi et al.…”