The novel Co-doped MoO3 microwave absorber prepared by heat treatment

Abstract

Abstract The Co doped α-MoO3 microwave absorbers were prepared by heat treatment technology. The oxygen vacancy, conductivity, and electromagnetic (EM) parameters of the material could be manipulated by changing the heat treatment temperature. The microwave absorption mechanism was explored. X-ray diffraction, Raman, scanning electron microscopy, x-ray photoelectron spectroscopy, and vector network analyzer were used to characterize the Co-doped α-MoO3 samples. The orthorhombic phases and scale-layer rod-like structure were observed to favor absorption via multiple transmission paths to EM waves. Notably, the material prepared by heat treatment at 500 °C exhibits a synergistic effect of magnetic and dielectric loss, due to its proper conductivity, rich interfaces and magnetism. The effective absorption bandwidth reaches 2.4 GHz.