Self-Assembly-Magnetized MXene Avoid Dual-Agglomeration with Enhanced Interfaces for Strong Microwave Absorption through a Tunable Electromagnetic Property
Self-Assembly-Magnetized MXene Avoid Dual-Agglomeration with Enhanced Interfaces for Strong Microwave Absorption through a Tunable Electromagnetic Property
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DOI：
10.1021/acsami.9b11861
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发表时间：
2019-11-27
影响因子：
9.5
通讯作者：
Che, Renchao
中科院分区：
文献类型：
--
作者：
Li, Xiao;You, Wenbin;Che, Renchao
为提高电磁波吸收性能，迫切需要能够提供大量界面的多层微波吸收材料。同时，如何有效避免团聚，进一步拓宽吸收带仍是一个挑战。本文通过多层Mxene与Ni(OH)(2)纳米片之间的静电自组装相互作用，然后在H-2/Ar气氛中进行原位还原，制备了手风琴状磁化Mxene/Ni复合材料。在MXene/Ni纳米复合材料(磁化MXene)相邻的2D(2维)Mxene(Ti3C2Tx)的多层间隙之间，Ni纳米颗粒均匀分布，没有磁团聚现象，在5.5 GHz处具有明显的吸收性能，最大反射损耗可达-50.5分贝。此外，还首次用电子全息分析方法研究了磁化MXene吸波材料的动态磁响应。相关的关键机制包括增强的磁损耗，较少的双团聚(多层MXene本身和磁性团聚)，以及更多的界面和相关极化的本征缺陷。通过改变MXene与Ni的质量比可以进一步获得更宽的吸收带宽，其最大吸收带宽为5.28 GHz。这项工作为MXene基纳米复合材料的强吸收强度、可调谐电磁性能和宽吸收带宽之间的平衡提供了一条新的途径。
Multilayered microwave absorbers which can provide massive interfaces are highly needed for electromagnetic-wave absorption property enhancement. Meanwhile, how to effectively avoid agglomeration and further widen the absorption band is still a challenge. Herein, accordion-like magnetized MXene/Ni composites were fabricated by the electrostatic self-assembly interaction between multilayer MXene and Ni(OH)(2) nanoplates and subsequent in situ reduction in the H-2/Ar atmosphere. Ni nanoparticles were uniformly distributed without magnetic agglomeration between the multilayered gaps of the adjacent 2D (2 dimension) MXene (Ti3C2Tx) of MXene/Ni nanocomposites (magnetized MXene), which hold the distinct absorption performance that the reflection loss maximum measures up to -50.5 dB at 5.5 GHz. Moreover, dynamic magnetic response of the magnetized MXene absorber was first researched by the electron holography analysis. The related key mechanism includes the enhanced magnetic loss, less dual-agglomeration (multilayer MXene itself and magnetic agglomeration), and more interfaces and intrinsic defects for related polarization. A broadened absorption bandwidth can further be obtained by changing the mass ratio of MXene to Ni that possesses the widest absorption bandwidth of 5.28 GHz. This work provides a new route for the balance among strong absorption intensity, tunable electromagnetic properties, and wide absorption bandwidth of the MXene-based nanocomposites.