Journal
DIAMOND AND RELATED MATERIALS
Volume 112, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.diamond.2021.108245
Keywords
Reduced graphene oxide; Nitrogen doping; Multi-walled carbon nanotubes; Composite aerogels; Electromagnetic wave absorption
Categories
Funding
- Anhui Provincial Natural Science Foundation [2008085J27]
- Foundation of Provincial Natural Science Research Project of Anhui Colleges [KJ2019A0119]
- Research and Development Project of Wuhu Research Institute of Anhui University of Science and Technology [ALW2020YF05]
- China Postdoctoral Science Foundation [2019M652160]
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The nitrogen-doped reduced graphene oxide/multi-walled carbon nanotubes (NRGO/MWCNTs) composite aerogel was synthesized through a hydrothermal self-assembly and freeze-drying method, showing great EMW absorption capacity and a wide absorption bandwidth. The aerogel has a 3D porous network structure and reflection loss values below -10 dB, indicating high absorption efficiency.
In this work, nitrogen-doped reduced graphene oxide/multi-walled carbon nanotubes (NRGO/MWCNTs) composite aerogel was synthesized through a hydrothermal self-assembly and freeze-drying two-step method. Results of micromorphology and structure analysis showed that three-dimensional (3D) porous network structure with a pore size of several microns was well constructed and numerous MWCNTs were on top of wrinkled surfaces of flake-like RGO and lots of nitrogen atoms were doped into RGO. Significantly, the obtained NRGO/MWCNTs composite aerogel with the density of 7.4 mg/cm3 exhibited the integrated optimal EMW absorption capacity that was the minimum reflection loss of-46.3 dB at 11 GHz (X-band), and broad absorption bandwidth of 4.2 GHz (from 13.3 to 17.5 GHz) under an ultrathin matching thickness of merely 1.4 mm and low filler content of 15 wt%. Meanwhile, the reflection loss values were all less than-10 dB (90% absorption) with matching thickness changing from 1.4 to 4.5 mm. The possible EMW absorption mechanisms were further proposed. Therefore, the as-fabricated NRGO/MWCNTs composite aerogel could be exploited as promising lightweight and high-efficient absorbers in the field of EMW absorption.le
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