Juan Cui, Jun Li*, Zhengyu Zhang, Tongtong Xu, Zegeng Chen, Zeyang Zhang, Qingxin Meng and Zhongxiang Zhou*,
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引用次数: 0
摘要
电磁波吸收性能严格取决于衰减和阻抗匹配,而衰减和阻抗匹配直接受到多层结构 MXene/MAX 复合材料中 MXene/MAX 比例的影响。然而,如何通过精确调节 MXene/MAX 的比例关系实现介质损耗和阻抗匹配的协同优化仍是一个挑战。本文通过合理控制水热反应的温度和时间,成功合成了不同 V2C/V2AlC 比例的 V 基 MXene/MAX 异质结构复合材料。实验结果表明,V2C-100 ℃-1在阻抗匹配降低和介质损耗增强之间取得了平衡,这归因于传导损耗和极化损耗的轻度增强。第一性原理表明,大量电子从 MXene 的 V 原子迁移到 MAX 相的 C 原子。电荷在界面上重新分布和积累,导致 V2C-100 °C-1 的介电损耗增加。因此,V2C-100 °C-1 异质结构复合材料具有极佳的电磁吸收效果,其最小反射损耗为 -50.06 dB,有效吸收带宽为 4.0 GHz(12.72-16.72 GHz)。这项工作为开发基于 MXene 的高效微波吸收材料提供了宝贵的经验。
V-Based MXene/MAX Heterostructure Composites with Enhancing Dielectric Loss for Broadband Microwave Absorption
Electromagnetic wave absorption performance is strictly dependent on attenuation and impedance matching, which are directly influenced by the ratio of MXene/MAX in the multilayer structured MXene/MAX composites. However, there is still a challenge to achieve collaborative optimization of dielectric loss and impedance matching by precisely regulating the proportional relationship of MXene/MAX. Herein, V-based MXene/MAX heterostructure composites with different V2C/V2AlC ratios were successfully synthesized by rationally controlling the temperature and time of the hydrothermal reaction. Experimental results indicated that V2C-100 °C-1 harvested the balance between reduced impedance matching and enhanced dielectric losses, which was attributed to the mildly enhanced conduction loss and polarization loss. The first principles indicated that abundant electrons migrate from the V atoms of the MXene to the C atoms of the MAX phase. The charge redistributed and accumulated at the interface, exciting the increase in the dielectric loss of V2C-100 °C-1. As a result, the V2C-100 °C-1 heterostructure composite had an excellent electromagnetic absorption effect with a minimum reflection loss of −50.06 dB and a wide effective absorption bandwidth of 4.0 GHz (12.72–16.72 GHz). This work provides a valuable experience for the development of efficient MXene-based microwave absorbing materials.
期刊介绍:
Inorganic Chemistry publishes fundamental studies in all phases of inorganic chemistry. Coverage includes experimental and theoretical reports on quantitative studies of structure and thermodynamics, kinetics, mechanisms of inorganic reactions, bioinorganic chemistry, and relevant aspects of organometallic chemistry, solid-state phenomena, and chemical bonding theory. Emphasis is placed on the synthesis, structure, thermodynamics, reactivity, spectroscopy, and bonding properties of significant new and known compounds.