Polarization-enhanced three-dimensional Co3O4/MoO2/C flowers as efficient microwave absorbers,Journal of Materials Chemistry C

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Polarization-enhanced three-dimensional Co3O4/MoO2/C flowers as efficient microwave absorbers
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2020-06-23 , DOI: 10.1039/d0tc02421j
Linshen Xing _{1,

2,

3,

4} , Zhengchen Wu _{1,

2,

3,

4} , Lei Wang _{1,

2,

3,

4} , Jingjun Ding _{1,

2,

3,

4} , Guangzhou Ding _{1,

2,

3,

4} , Xuefeng Yu _{1,

2,

3,

4} , Guanyu Chen _{1,

2,

3,

4} , Jie Zhang _{1,

2,

3,

4} , Renchao Che _{1,

2,

3,

4}

Affiliation

Three-dimensional (3D) hierarchical structures have been widely employed to enhance the microwave absorption performance due to their large surface area, satisfied impedance matching and polymorphic morphology. However, to achieve multiphase and multifunctional performance only within a primary unit remains a tremendous challenge. Herein, special carbon-based C/MoO₂/Co₃O₄ nanosheets were assembled into a flower-like hierarchical architecture by a facile coordination-polymerization method. Abundant Co₃O₄ magnetic nanoparticles were anchored onto carbon nanoflake substrates, leading to both enhanced polarization and enhanced magnetic coupling. Meanwhile, a large number of heterogeneous junction interfaces among MoO₂ nanoparticles and carbon substrates enhanced the interface polarization. Therefore, the C/MoO₂/Co₃O₄ microflower achieved a minimum reflection loss of −59.7 dB at 17.7 GHz with a thickness of only 1.2 mm, indicative of its great potential as a lightweight microwave absorption material.

中文翻译：

极化增强的三维Co3O4 / MoO2 / C花可作为有效的微波吸收剂

三维（3D）分层结构由于其较大的表面积，令人满意的阻抗匹配和多态形态而被广泛用于增强微波吸收性能。然而，仅在主单元内实现多相和多功能性能仍然是巨大的挑战。在此，通过简便的配位聚合法将特殊的碳基C / MoO ₂ / Co ₃ O ₄纳米片组装成花状的分层结构。丰富的Co ₃ O ₄磁性纳米颗粒被锚固在碳纳米片基质上，从而导致增强的极化和增强的磁耦合。同时，MoO ₂纳米颗粒与碳衬底之间的大量异质结界面增强了界面极化。因此，C / MoO ₂ / Co ₃ O ₄微型花在17.7 GHz处的最小反射损失为-59.7 dB，厚度仅为1.2 mm，表明其作为轻质微波吸收材料的巨大潜力。

更新日期：2020-08-06

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