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Vol. 10 No. 2 (2018)

Porous Graphene Microflowers for High-Performance Microwave Absorption

https://doi.org/10.1007/s40820-017-0179-8
Chen Chen
MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province, Zhejiang University, 38 Zheda Road, Hangzhou 310027, People’s Republic of China
Jiabin Xi
MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province, Zhejiang University, 38 Zheda Road, Hangzhou 310027, People’s Republic of China
Erzhen Zhou
Department of Mechanical Engineering, Zhejiang University, 38 Zheda Road, Hangzhou 310027, People’s Republic of China
Li Peng
MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province, Zhejiang University, 38 Zheda Road, Hangzhou 310027, People’s Republic of China
Zichen Chen
Department of Mechanical Engineering, Zhejiang University, 38 Zheda Road, Hangzhou 310027, People’s Republic of China
Chao Gao
MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province, Zhejiang University, 38 Zheda Road, Hangzhou 310027, People’s Republic of China

Corresponding Author: Chao Gao

chaogao@zju.edu.cn

Nano-Micro Letters, Vol. 10 No. 2 (2018), Article Number: 26

Abstract

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 compared with other porous graphene materials including aerogels and foams.


Highlights:


1 Graphene microflowers (Gmfs) for outstanding microwave absorption performance are produced via a three-step protocol.
2 The porous Gmfs show a broad efficient absorption bandwidth of 5.59 GHz with a minimum reflection loss of −42.9 dB, outperforming most graphene-based materials ever reported.
3 The mass productivity, low filler content (10%) and low density (40–50 mg cm−3) of Gmfs are favorable for their practical applications.

Keywords

Graphene Microflowers Porous Microwave absorption
Chen, Chen, Jiabin Xi, Erzhen Zhou, Li Peng, Zichen Chen, and Chao Gao. 2017. “Porous Graphene Microflowers for High-Performance Microwave Absorption”. Nano-Micro Letters 10 (2):26. https://doi.org/10.1007/s40820-017-0179-8.
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