Graphene-wrapped ZnO hollow spheres with enhanced electromagnetic wave absorption properties

Reduced graphene oxide decorated with in-situ growing ZnO nanocrystals: Facile synthesis and enhanced microwave absorption properties

“…Wu et al mixed freeze-dried RGO aerogel and commercial ZnO nanoparticle in distill water with high speed stirring, then investigated the dielectric and microwave absorption properties of the hybrid [38]. Han et al synthesized RGO-wrapped ZnO hollow spheres using surfactant-assisted solution mixing method, which showed enhanced microwave absorption properties [39]. A composite fabricated by mixing RGO and tetrapod-like ZnO exhibited good microwave absorption properties according to Han's research [11].…”

“…However, all the composites mentioned above are prepared by solution mixing method thus the uniformity and dispersity of the hybrids are limited. It is known that interfacial polarization plays an important role in microwave attenuation, which can be enhanced by increasing the interface between different dielectric in absorber [18,39]. The uniformity and dispersity of composites are beneficial to increasing of the interface of heterostructure.…”

Dual Band Resonance in Tetragonal BaTiO3/NBR Composites for Microwave Absorption Applications

“…With incidence of MW radiation, the dielectric polarization appears at BaTiO 3 grains embedded in NBR matrix. 32 The interacted MW radiation will be attenuated during dipolar (both inherent and interfacial) relaxation process. Further, multiple scattering phenomenon in the composite eventually leads to higher losses of electromagnetic energy due to the larger interaction of microwaves with electric dipoles in BaTiO 3 material.…”

Significant promotion of porous architecture and magnetic Fe3O4 NPs inside honeycomb-like carbonaceous composites for enhanced microwave absorption

“…Conveniently, to address this issue many carbonaceous materials such as carbon nanotubes (CNTs), carbon laments, carbon bers and chemically derived graphene have been used as composite materials for electromagnetic-wave absorbers owing to their light weight, exibility, high thermal conductivity, excellent mechanical properties and high electrical conductivity. [17][18][19][20] However, most of these composites still have many disadvantages; for example, one-dimensional CNTs and two-dimensional graphene have a tendency to undergo restacking and aggregation during the preparation process, which possibly leads to a distinct reduction in available properties. Moreover, the processing methods of these carbon-based microwave-absorbing materials are relatively complicated and incur high costs.…”