16November2018

Nano-Micro Letters

Porous Graphene Microflowers for High-Performance Microwave Absorption

Chen Chen1, Jiabin Xi1, Erzhen Zhou2, Li Peng1, Zichen Chen2, *, Chao Gao1, *

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Nano-Micro Lett. (2018) 10: 26

First Online: 28 November 2017 (Article)

DOI:10.1007/s40820-017-0179-8

*Corresponding author. E-mail: chaogao@zju.edu.cn ; chenzc@zju.edu.cn

 

Abstract

 


Fig. 1 a Schematic illustration of the formation of Gmfs. b, c SEM images of Gmfs. The insert is the digital picture of the 0.4 g Gmfs powder in a 20 mL bottle. d, e TEM images of an individual Gmfs

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 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 compared with other porous graphene materials including aerogels and foams.


 

Keywords

Graphene; Microflowers; Porous; Microwave absorption

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