Enhancing the microwave absorbing properties of molybdenum dioxide by designing a double-layered structure

Abstract

MoO2, which has a high electrical conductivity and chemical stability, is suitable for use as a dielectric absorbing material. In this research, MoO2 was synthesized by reducing MoO3 at a high temperature, and the electromagnetic and absorption properties of MoO2 were tailored by the reduction time. According to the testing results, MoO3 was transformed into MoO2 by prolonging the reduction time, which was accompanied by a simultaneous increase of the complex permittivity; however, the absorption bandwidth was narrow because of the low impedance matching degree or attenuation constant. With the aim of broadening the absorption bandwidth, a double-layered absorbing structure was designed based on the tested electromagnetic parameters. When the thicknesses of the impedance matching layer and the absorbing layer were both 1.2 mm, the absorption bandwidth was 5.1 GHz, representing a highly enhanced absorption bandwidth.