Jinxiao Wang, Jianfeng Yang, Jun Yang, Hui Zhang
State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China.
Nanotechnology. 2020 Oct 9;31(41):414001. doi: 10.1088/1361-6528/ab9e93. Epub 2020 Jun 19.
Carbon-nanotube-based composites are highly desirable for addressing the difficulties relevant to the quality of electromagnetic wave absorbers. The introduction of lightweight nanocomposites for constructing new structures has been widely studied due to the transformation in impedance matching and attenuation. In this paper, a novel carbon nanotube-graphene oxide-zeolitic imidazolate framework-8 (CNT/RGO/ZIF-8) ternary hybrid structure was successfully fabricated by a facile solvothermal process. The ZIF-8 was entangled initially by carbon nanotubes via the π-π interaction between organic ligands and benzene ring structure in CNT. Then, the CNT/ZIF-8 composite was immobilized on the surface of RGO by interacting with the active functional group of RGO. The structure and performance for CNT, CNT/ZIF-8, and CNT/RGO/ZIF-8 were compared to investigate the interaction mechanisms between components, and CNT/ZIF-8 exhibited a distinct improvement for microwave absorption performance. Furthermore, the introduction of RGO can accelerate the amelioration of absorption characteristics. The interfacial bonding between CNT, RGO, and ZIF-8 exerts a great influence on the absorbing quality. The mechanism of absorption of electromagnetic waves was explained by the synergistic effects of conduction loss, polarization behaviors, and eddy current. The unique structure could offer new insights to exploit advanced microwave-absorption materials.
基于碳纳米管的复合材料对于解决与电磁波吸收体质量相关的难题非常理想。由于阻抗匹配和衰减的转变，引入轻质纳米复合材料来构建新结构已得到广泛研究。本文通过简便的溶剂热法成功制备了一种新型的碳纳米管-氧化石墨烯-沸石咪唑酯骨架-8（CNT/RGO/ZIF-8）三元杂化结构。ZIF-8最初通过有机配体与CNT中苯环结构之间的π-π相互作用被碳纳米管缠绕。然后，CNT/ZIF-8复合材料通过与RGO的活性官能团相互作用固定在RGO表面。比较了CNT、CNT/ZIF-8和CNT/RGO/ZIF-8的结构和性能，以研究各组分之间的相互作用机制，并且CNT/ZIF-8在微波吸收性能方面表现出明显改善。此外，RGO的引入可以加速吸收特性的改善。CNT、RGO和ZIF-8之间的界面结合对吸收质量有很大影响。通过传导损耗、极化行为和涡流的协同效应解释了电磁波的吸收机制。这种独特的结构可为开发先进的微波吸收材料提供新的见解。
