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Enhanced visualizing charge distribution of 2D/2D MXene/MoS2 heterostructure for excellent microwave absorption performance
Journal of Alloys and Compounds ( IF 6.2 ) Pub Date : 2021-03-01 , DOI: 10.1016/j.jallcom.2021.159365
Xiao Li , Caiyue Wen , Liting Yang , Ruixuan Zhang , Yuesheng Li , Renchao Che

The unique 2D/2D heterostructures can fully combine their respective 2D properties and exhibit enhanced performance due to its synergistic effect. However, how to effectively introduce other foreign 2D materials on the 2D MXene substrate, as well as research on their detailed synergistic effects, is still in lack. Herein, 3D conductive interconnected network with massive 2D/2D heterostructures in MXene-MoS2 composites are constructed by a facile hydrothermal reaction, and the microwave absorption mechanism accompanying the synergistic effect is detailed analyzed. Impressively, the unique off-axis electron holography is firstly used to visually characterize the distribution of charge density at the 2D interface, which constructs an effective relationship between the charge density distribution at the 2D/2D heterostructures and the strength of the microwave absorption performance. In addition, the confined space provided by each independent accordion-like multilayered MXene facilitates the heterogeneous coupling between the layers to increase its dielectric loss capability. Accordingly, the MXene-MoS2 composite holds the excellent microwave absorption performance accompanied by the superior reflection loss (RL) (−46.72 dB) and the distinct effective absorption bandwidth (EAB) (4.32 GHz) at only 2 mm thickness. This work refers an archetype for studying the synergistic effect between 2D/2D heterostructures.



中文翻译:

增强了2D / 2D MXene / MoS 2异质结构的可视化电荷分布,具有出色的微波吸收性能

独特的2D / 2D异质结构可充分结合其各自的2D特性,并由于其协同效应而展现出增强的性能。然而,仍然缺少如何有效地将其他外来2D材料引入2D MXene基板以及对其详细的协同效应进行研究的方法。此处,MXene-MoS 2中具有大规模2D / 2D异质结构的3D导电互连网络通过简单的水热反应制备了复合材料,并详细分析了协同作用下的微波吸收机理。令人印象深刻的是,首先使用独特的离轴电子全息图来直观地表征2D界面处的电荷密度分布,这在2D / 2D异质结构处的电荷密度分布与微波吸收性能强度之间建立了有效的关系。此外,每个独立的手风琴状多层MXene所提供的受限空间有利于各层之间的异质耦合,从而提高其介电损耗能力。因此,MXene-MoS 2复合材料在仅2 mm的厚度下具有出色的微波吸收性能,并具有出色的反射损耗(RL)(−46.72 dB)和独特的有效吸收带宽(EAB)(4.32 GHz)。这项工作是研究2D / 2D异质结构之间协同效应的原型。

更新日期:2021-03-07
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