Preparation and microwave absorption properties of microsheets VO2(M).

Microsheets structural VO 2 (M) was prepared by a hydrothermal and subsequent annealing method in this work. After a system characterization, it is found that VO 2 (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) VO 2 (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 VO 2 (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 VO 2 (M) can be used as a nice candidate multifunctional infrared/radar stealth materials, thus, extends the application of VO 2 (M). Schematic illustration of the mechanism of EM wave absorption for microsheets VO 2 (M). Image 1 • Two dimensional (2D) VO 2 (M) have excellent microwave absorption properties. • 2D VO 2 (M) is a nice candidate multifunctional infrared/radar stealth materials. • The surface charge resistance could contribute to the resistance loss. • To form surface polarizations, the defects density need to be appropriate. [ABSTRACT FROM AUTHOR]