期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 608, 期 -, 页码 1212-1221出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2021.10.112
关键词
Graphene; Cerium oxide; Nitrogen doping; Oxygen vacancy; Composite aerogel; Microwave dissipation
资金
- Anhui Provincial Natural Science Foundation [2008085J27]
- Research Foundation of the Institute of Environment-friendly Materials and Occupational Health (Wuhu)
- Anhui University of Science and Technology [ALW2020YF05]
- China Postdoctoral Science Foundation [2019M652160]
- National Training Program of Innovation and Entrepreneurship for Undergraduates [202110361090]
Nitrogen-doped reduced graphene oxide/cerium oxide (NRGO/CeO2) composite aerogels with low bulk density and unique 3D porous structure were fabricated via a hydrothermal route. The addition of CeO2 nanoparticles and careful regulation of CeO2 contents significantly improved the microwave dissipation performance of NRGO aerogels. The composite aerogel with a CeO2 content of 44.11 wt% exhibited excellent microwave attenuation capacity.
Three-dimensional (3D) graphene aerogels with porous structure and lightweight feature have been regarded as promising candidates for microwave attenuation. Herein, nitrogen-doped reduced graphene oxide/cerium oxide (NRGO/CeO2) composite aerogels were fabricated via a hydrothermal route. The obtained composite aerogels possessed low bulk density and unique 3D porous netlike structure constructed by the stacking of lamellar NRGO. Moreover, it was found that the microwave dissipation performance of NRGO aerogel could be notably improved through complexing with CeO2 nanoparticles and carefully regulating the contents of CeO2 in the composite aerogels. Remarkably, the attained NRGO/CeO2 composite aerogel with the content of CeO2 of 44.11 wt% presented the comprehensively excellent microwave attenuation capacity, i.e. the optimal reflection loss reached -50.0 dB (larger than 99.999% absorption) at a thickness of 4.0 mm and wide bandwidth achieved 5.7 GHz (from 12.3 GHz to 18.0 GHz, covering 95.0% of Ku-band) under an ultrathin thickness of only 1.9 mm. Furthermore, the probable microwave dissipation mechanisms of as-synthesized composite aerogels were clarified, which included the optimized impedance matching, strengthened interfacial polarization and dipole polarization relaxation, notable oxygen vacancy effect and enhanced conduction loss. This work could shed light on developing graphene-based 3D broadband microwave absorption composites. (C) 2021 Elsevier Inc. All rights reserved.
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