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Research Article

Two-dimensional CoNi@mesoporous carbon composite with heterogeneous structure toward broadband microwave absorber

Yun Qiu1, Haibo Yang1( ), Fanfan Hu2, Ying Lin1( )
Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, School of Materials Science and Engineering, Shaanxi University of Science and Technology, Xi’an 710021, China
Jiangsu Product Quality Testing & Inspection Institute, Nanjing 210007, China
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Graphical Abstract

Two-dimensional cobalt and nickel alloys@mesoporous carbon composite exhibited the maximum reflection loss of −70.86 dB and the widest absorption bandwidth of 7.74 GHz.

Abstract

Constructing composites with heterogeneous structure and dual loss mechanism shows great potential in designing microwave absorbers. In this work, two-dimensional cobalt and nickel alloys@mesoporous carbon (CoNi@MC) composites were constructed via using CoNi layered double hydroxide@mesoporous polydopamine (CoNi LDH@MPDA) as sacrifice template. During the pyrolysis process, the MPDA is transformed into mesoporous carbon coated the surface of CoNi LDH that is further reduced to CoNi alloys. The mesoporous structure is conducive to the multi-reflection of electromagnetic waves and facilitates optimizing impedance matching. Heterogeneous interfaces between CoNi alloys and mesoporous carbon induce interface polarization. Multiple attenuation mechanism promotes the electromagnetic waves conversion. The maximum reflection loss of CoNi@MC composite is −70.86 dB and the widest effective absorption bandwidth is 7.74 GHz covering almost the entire Ku band. This strategy will be a guidance for designing electromagnetic absorbers.

Keywords

CoNi alloysmesoporous carbonmicrowave absorptionbroad efficient frequency

Electronic Supplementary Material

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Nano Research
Volume 15 Issue 9,
September 2022
Pages 7769-7777
DOI: 10.1007/s12274-022-4617-7
Cite this article:
Qiu Y, Yang H, Hu F, et al. Two-dimensional CoNi@mesoporous carbon composite with heterogeneous structure toward broadband microwave absorber. Nano Research, 2022, 15(9): 7769-7777. https://doi.org/10.1007/s12274-022-4617-7
Topics:
Porous carbon
Part of a topical collection:
EM Wave Functional Materials

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Received: 06 April 2022
Revised: 30 May 2022
Accepted: 30 May 2022
Published: 11 July 2022
© Tsinghua University Press 2022
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