Issue 2, 2019

Ultralight CoNi/rGO aerogels toward excellent microwave absorption at ultrathin thickness

Abstract

Ultrathin thickness (<1 mm) and ultralow density (<10 mg cm−3) are urgent challenges for microwave absorption materials. In this manuscript, we tackle these problems by developing a novel CoNi/reduced graphene oxide (rGO) aerogel absorbent via a facile in situ solvothermal and carbonization process. The resultant CoNi/rGO aerogel with an ultralow density of 7 mg cm−3 exhibited a hierarchical porous structure and a high surface area, in which CoNi nanospheres with a diameter of about 50–80 nm were evenly decorated onto the surface of the rGO aerogel matrix. Benefitting from these attributes, the CoNi/rGO aerogel exhibited an excellent microwave absorption performance. The minimum RL value of −53.3 dB was achieved with an ultrathin thickness of 0.8 mm at a low filler loading of 7 wt% in the paraffin template, and the effective absorption bandwidth was >3.5 GHz. The investigation of the absorption mechanism revealed that moderate dielectric loss, magnetic loss, good impedance matching and the porous structure contributed to the high microwave absorption. This work opens up a potential strategy to prepare excellent microwave absorbents with ultrathin thickness and ultralow density.

Graphical abstract: Ultralight CoNi/rGO aerogels toward excellent microwave absorption at ultrathin thickness

Article information

Article type
Paper
Submitted
17 10 2018
Accepted
30 11 2018
First published
04 12 2018

J. Mater. Chem. C, 2019,7, 441-448

Ultralight CoNi/rGO aerogels toward excellent microwave absorption at ultrathin thickness

H. Zhao, J. Cheng, J. Zhu and Y. Wang, J. Mater. Chem. C, 2019, 7, 441 DOI: 10.1039/C8TC05239E

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