Self‑Assembly MXene‑rGO/CoNi Film with Massive Continuous Heterointerfaces and Enhanced Magnetic Coupling for Superior Microwave Absorber  

作　　者：Xiao Li Zhengchen Wu Wenbin You Liting Yang Renchao Che 

机构地区：[1]Laboratory of Advanced Materials,Shanghai Key Lab of Molecular Catalysis and Innovative Materials,Fudan University,Shanghai 200438,People’s Republic of China [2]Department of Materials Science,Fudan University,Shanghai 200438,People’s Republic of China

出　　处：《Nano-Micro Letters》2022年第5期20-33,共14页纳微快报（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(11727807,51725101,51672050,61790581,22088101);the Ministry of Science and Technology of China(973 Project No.2018YFA0209102);Open access funding provided by Shanghai Jiao Tong University

摘　　要：MXene, as a rising star of two-dimensional(2 D) materials, has been widely applied in fields of microwave absorption and electromagnetic shielding to cope with the arrival of the 5 G era. However, challenges arise due to the excessively high permittivity and the difficulty of surface modification of few-layered MXenes severely, which infect the microwave absorption performance. Herein, for the first time, a carefully designed and optimized electrostatic selfassembly strategy to fabricate magnetized MXene-r GO/Co Ni film was reported. Inside the synthesized composite film, r GO nanosheets decorated with highly dispersed Co Ni nanoparticles are interclacted into MXene layers, which effectively suppresses the originally self-restacked of MXene nanosheets, resulting in a reduction of high permittivity. In addition, owing to the strong magnetic coupling between the magnetic Fe Co alloy nanoparticles on the r GO substrate, the entire MXener GO/Co Ni film exhibits a strong magnetic loss capability. Moreover, the local dielectric polarized fields exist at the continuous heterointerfaces between 2 D MXene and r GO further improve the capacity of microwave loss. Hence, the synthesized composite film exhibits excellent microwave absorption property with a maximum reflection loss value of-54.1 d B at 13.28 GHz. The electromagnetic synergy strategy is expected to guide future exploration of high-efficiency MXene-based microwave absorption materials.

关 键 词：MXene Microwave absorption Composite materials GRAPHENE Electron holography 

分 类 号：TB383.2[一般工业技术—材料科学与工程]