Preparation and microwave absorption properties of microsheets VO₂(M)

Microsheets structural VO₂(M) was prepared by a hydrothermal and subsequent annealing method in this work. After a system characterization, it is found that VO₂(M) microsheets obtained by annealing method at 570 °C has a minimum RL value of −45.8 dB and a maximum effective absorption bandwidth (RL < −10 dB) of 3.37 GHz (10.06–13.40 GHz) at 1.9 mm. This result demonstrated that two dimensional (2D) VO₂(M) have excellent microwave absorption properties. With carefully analysis we concluded that the surface defects and the geometry of the unique 2D geometry of the microsheets VO₂(M) induces additional polarizations, which improve the microwave absorption properties of samples. A model suggested to explain the enhanced EM wave absorption performance, in which appropriate density of defects induces high defects induced polarization and over high defects density result in the overlap of the bound state around defects and result in the collapse of defects related polarization as illustrated in the abstract graph. Our findings demonstrated that 2D VO₂(M) can be used as a nice candidate multifunctional infrared/radar stealth materials, thus, extends the application of VO₂(M).