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Research progress in dielectric graphene microwave absorbing composites |
Zongbo DU, Shuangqiang SHI, Yubin CHEN, Hairong CHU, Cheng YANG( ) |
Research Center of Graphene Applications, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China |
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Abstract Graphene is widely considered a promising candidate for microwave absorbing materials in the future due to its unique dielectric properties, high specific surface area, low density and other outstanding properties. However, the single component graphene has poor microwave absorbing properties, so graphene-based microwave absorbing composites have become a research hotspot in recent years. In this paper, microwave absorbing mechanism and characteristics of graphene and its composites were introduced. Accordingly, it indicates that dielectric graphene microwave absorbing composites have the potential to become lightweight, high-intensity, broadband, and thin-layer microwave absorbing materials.The research progress in dielectric graphene microwave absorbing composites was reviewed from two aspects of graphene matrix and dopant.Finally, it was pointed out that developing new dielectric dopants with strong loss ability, constructing microwave absorbing composites with multiple components, establishing common design methods, as well as exploring large scale preparation methods would become the research trends in the future.
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Received: 29 September 2020
Published: 18 April 2022
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Corresponding Authors:
Cheng YANG
E-mail: chengyang_78@126.com
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25] (a)polarization at dipoles; (b)polarization at capacitor-like structures; (c)electron hopping; (d)multi-scattering ">
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Microwave absorbing mechanism of graphene[25] (a)polarization at dipoles; (b)polarization at capacitor-like structures; (c)electron hopping; (d)multi-scattering
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38] ">
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Microwave loss mechanism of three-dimensional graphene foam[38]
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Graphene matrix | Dopant | Doping method | Loading/% (in paraffin) | Thickness/mm | RLmin/dB | EAB/GHz | Ref | rGO foam | SiC nanowires | In-situ growth | * | 3 | -19.6 | 4.2 | [41] | rGO foam | ZnO nanowires | Hydrothermal | 3.3 | 4.8 | -27.8 | 4.2 | [42] | 3D graphene foam | Si3N4 nanowires | Carbothermal | 50 | 2.36 | -48.8 | | [43] | 3D graphene foam | SiC coating | CVD growth | 50 | 3.6 | -51.58 | 10.84 | [44] | 3D rGO aerogel | Ag(Ⅰ)-Schiff base | Ball mill mixing | 50 | 2 | -63.82 | 6.28 | [45] |
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Examples of holey three-dimensional graphene matrix
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72] (a)SEM image; (b)reflection loss properties ">
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Starlike ZnO/rGO doped by ZnO nanocrystals composites[72] (a)SEM image; (b)reflection loss properties
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Sort | Graphene matrix | Dopant | Doping method | Loading/% (in paraffin) | Thickness/mm | RLmin/dB | EAB/GHz | Ref | Two- | rGO | h-BN | Heat treatment | 25 | 1.6 | -40.5 | 5 | [50] | dimensional | mechanical peeled rGO | h-BN nanoparticles | Ball mill mixing | 40 | 3.29 | -67.35 | | [51] | materials | rGO | MoS2 | Heat treatment | 10 | 1.9 | | 5.72 | [54] | | rGO | MoS2 | Hydrothermal | 20 | 1.6 | -55.3 | | [55] | | rGO | Ti3C2Tx | Hydrothermal | 15 | 2.05 | -31.2 | 5.4 | [61] | | GO aerogel | Ti3C2Tx | Electrostatic spinning | 10 | 1.2 | -49.1 | 2.9 | [62] | Oxides | rGO | TiO2 nanosheets | Hydrothermal | 20 | 2.1 | -27.2 | 5.2 | [63] | | 2D carbon sheets | TiO2 | Heat treatment | 45 | 1.7 | -36 | 5.6 | [64] | | rGO | SiO2/NiO | Hydrothermal | 25 | 3 | -20.5 | 5 | [65] | | rGO | ZnO nanocrystals | In-situ growth | 15 | 2.4 | -54.2 | 6.7 | [67] | | rGO | Tetrapod-like ZnO | Hydrothermal | 15 | 2.9 | -59.5 | 6.8 | [71] | | rGO | Starlike ZnO | In-situ growth | 25 | 4.5 | -77.5 | 6.9 | [72] | Other | rGO aerogel | SiC whiskers | Thermal treatment | * | 3 | -47.3 | 4.7 | [73] | dopants | rGO | CuS | In-situ growth | 20 | 2.5 | -54.5 | 4.5 | [74] | | rGO | BaTiO3 | Hydrothermal | | 2.5 | -44.9 | 5.4 | [75] | | rGO | CeO2 | Hydrothermal | 50 | 2.5 | -45.94 | 4.5 | [76] |
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Examples of dielectric dopants
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80] (a)real part of permittivity ε′; (b)imaginary part of permittivity ε″; (c)tangent loss tanδ; (d)conductivity σ; (e)imaginary part of permittivity contributed by conductivity loss ε″ c; (f)imaginary part of permittivity contributed by polarization loss ε″ p ">
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Comparison between the electromagnetic properties of reduced graphene aerogel(rGOA) and SiC whiskers/reduced graphene aerogel(SiCw/rGOA) composites[80] (a)real part of permittivity ε′; (b)imaginary part of permittivity ε″; (c)tangent loss tanδ; (d)conductivity σ; (e)imaginary part of permittivity contributed by conductivity loss ε″ c; (f)imaginary part of permittivity contributed by polarization loss ε″ p
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