Two-dimensional lamellar stacked (NH4)0.8V3O7·3.5H2O: A promising material with high dielectric properties and microwave absorption performance

Abstract

Two-dimensional lamellar stacked (NH4)0.8V3O7·3.5H2O with controlled micromorphology was synthesized form hydrothermal method by adjusting the molar ratio of the NH4VO3 with H2C2O4·2H2O. The EDS, FT-IR, DSC&TG and XPS studies indicated that our product can be indexed as (NH4)0.8V3O7·3.5H2O. A minimum reflection loss (RL) value of −21.149 dB at 2.5 mm with effective absorption bandwidth (RL < −10 dB) of 3.611 GHz was realized on the lamellar stacked structure (NH4)0.8V3O7·3.5H2O sample, which was prepared with the NH4VO3 and H2C2O4·2H2O molar ratio of reactants is 1:1.25. The additional surface polarization and the surface resistance loss, which caused by the surface charge due to the specific surface of the lamellar stacked structure of sample, should response to its enhanced absorption performance. In addition, the unique lamellar stacked structure of our sample induced in the multiple reflections of the incident electromagnetic wave between different layers and the negative refractive index of left-handed materials (LHMs) will increase the number of the multiple reflections, which is conducive to improving its microwave absorption performance. The results in this work indicate that the lamellar stacked structure (NH4)0.8V3O7·3.5H2O is a potential advanced novel microwave absorber. Our study provides a new direction for the design of new electromagnetic wave absorbers.