Abstract
High performance microwave absorption(MA)materials especially those with tunable frequency are highly desirable for telecommunication industries and military camouflage in the information era.Herein,we constructed hierarchical heterostructures based on VB-group laminated vanadium disulfide(VS2)nanosheets embedded with cobalt tetroxide(Co3O4)nanoparticles.The highly dispersed Co3O4 nanopar-ticles generate strong electromagnetic coupling networks that could enhance the loss properties of MA materials.Moreover,the interconnected VS2 layered network results in dipolar/interfacial polarization,multiple reflection and scattering favorable for the enhanced MA performance.Impressively,the maxi-mum reflection loss of the VS2/Co3O4 hybrids containing 10％Co3O4 can reach 57.96 dB at a thin thick-ness of 1.57 mm,and the bandwidth with an RL value less than-10 dB is as large as 3.5 GHz.The effective MA band could be adjusted in a range of 15.1 GHz(2.9-18 GHz)from S to Ku bands by the in-crease in thickness from 1.2 mm to 5.5 mm.The results show that the synergistic effect of multiple loss mechanisms and good impedance matching could be the reasons for strong MA capability in nearly all frequency bands,and thus,the high-performance and lightweight MA materials could be developed by the VS2/Co3O4 hybrids.
基金项目
National Natural Science Foun-dation of China(51772160)
National Natural Science Foun-dation of China(51977009)
China Postdoctoral Sci-ence Foundation(2020M682029)
Regional Joint Fund for Basic Research and Applied Basic Research of Guangdong Province(2020SA001515110905)
NETL
NSTL
万方数据