Materials science

Optoelectronics

Graphene nanoribbons

Reflection loss

Graphene foam

Absorption (acoustics)

Graphene

Computer science

Nanotechnology

Electrical conductor

Porosity

Microstructure

Microwave

Composite number

Composite material

Telecommunications

Nano-Micro Letters

Graphene has shown great potential in microwave absorption (MA) owing to its high surface area, low density, tunable electrical conductivity and good chemical stability. To fully realize grapheneʼs MA ability, the microstructure of graphene should be carefully addressed. Here we prepared graphene microflowers (Gmfs) with highly porous structure for high-performance MA filler material. The efficient absorption bandwidth (reflection loss ≤ −10 dB) reaches 5.59 GHz and the minimum reflection loss is up to −42.9 dB, showing significant increment compared with stacked graphene. Such performance is higher than most graphene-based materials in the literature. Besides, the low filling content (10 wt%) and low density (40–50 mg cm−3) are beneficial for the practical applications. Without compounding with magnetic materials or conductive polymers, Gmfs show outstanding MA performance with the aid of rational microstructure design. Furthermore, Gmfs exhibit advantages in facile processibility and large-scale production ...

Porous Graphene Microflowers for High-Performance Microwave Absorption