3D porous NiCo2(CO3)3/reduced graphene oxide aerogel with heterogeneous interfaces for high-efficiency microwave absorption
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摘要: 创新的微观结构设计和合适的多组分策略对于具有强吸收和宽有效吸收频带（EAB）的先进电磁吸波材料（EAM）仍然具有挑战性。本文采用简单的水热还原法制备了自组装的3D网络结构NiCo2(CO3)3/RGO（NCR）气凝胶。独特的微观结构和多组分不仅解决了NiCo2(CO3)3颗粒的物理团聚，而且可以调整电磁参数以提高阻抗匹配和衰减能力。界面基体和宏观3D互联网格结构的协同效应可以实现高电磁波吸收（EMA）性能，在2.3 mm处最小反射损耗（RLmin）值为−58.5 dB，EAB为6.5 GHz。NiCo2(CO3)3/RGO气凝胶优异的EMA性能可归因于3D多孔结构的多重反射、散射和弛豫过程以及界面基体的强界面极化。
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关键词:
- NiCo2(CO3)3/RGO 气凝胶 /
- 结构设计 /
- 界面极化 /
- 微波吸收
Abstract: Advanced electromagnetic absorbing materials (EAMs) with strong absorption and a wide effective absorption bandwidth (EAB), using innovative microstructural design and suitable multicomponents remain a persistent challenge. Here, we report the production of a material by the hydrothermal reduction of a mixture of graphene oxide (GO), Ni(NO3)2·6H2O, and Co(NO3)2·6H2O, resulting in reduced GO (RGO) with a self-assembled 3D mesh structure filled with NiCo2(CO3)3 . The unique microstructure of this assembly not only solves the problem of NiCo2(CO3)3 particles agglomerating but also changes the electromagnetic parameters, thereby improving the impedance matching and attenuation ability. High electromagnetic wave absorption (EMA) was achieved by combining the 3D interconnected mesh structure and the various interfaces between NiCo2(CO3)3 and RGO. The minimal reflection loss (RLmin) was −58.5 dB at 2.3 mm, and the EAB was 6.5 GHz. The excellent EMA performance of the aerogel can be attributed to the multiple reflection, scattering, and relaxation process of the porous 3D structure as well as the strong polarization of the interfacial matrix.n of the interfacial matrix. -
Figure 2. (a) XRD patterns of NC, NCR-1, NCR-2 and RGO. (b) Digital photograph of NCR-1 aerogel. (c) SEM image of NC. (d-f) SEM images of NCR-1 with different resolutions. (g-i) SEM images of NCR-2 with different resolutions. (j-m) EDS elemental mapping images of the NCR-1 (dashed area in Fig. e). (j) Co, (k) Ni, (l) O, (m) C
Figure 3. (a) XPS spectra of NC, NCR-1 and NCR-2. XPS spectra of (b) C 1s, (c) O 1s, (d) Ni 2p, and (e) Co 2p of NC, NCR-1 and NCR-2. (f) Raman spectra of NC, NCR-1 and NCR-2
Figure 4. (a, b) The real part (ε') and the imaginary part (ε") of complex permittivity, (c, d) the real part (μ') and the imaginary part (μ") of complex permeability of NC, NCR-1, NCR-2
Figure 5. (a, b) Dielectric and magnetic loss tangents (ε″/ε′, μ"/μ'), (c) C0–f curves and (d) attenuation constant of NC, NCR-1, NCR-2
Figure 6. (a, b, c) RLmin, 1/4 λ curve, and impedance matching of NC, NCR-1 and NCR-2 at frequency and different thicknesses
Figure 8. Calculated theoretical RL value of NC, NCR-1, NCR-2: (a) three-dimensional images and (b) two-dimensional projection images
Figure 9. (a) Comprehensive comparison of the EMA performance based on RLmin and EAB of NC, NCR-1, NCR-2 and RGO. (b) Comprehensive comparison of the EMA performance given RLmin, and EAB with reported EMA materials
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