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 Okt. 2018
Accepted
30 Nov. 2018
First published
04 Dec. 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

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements