Effect of ultrasonic treatment on morphology and microwave absorption performance of ZnO spheres

Abstract

ZnO spheres were prepared by hydrothermal method, following calcination process and ultrasonic treatment. Effect of ultrasonic treatment on morphology and microwave absorption properties of ZnO spheres were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) and vector network analyzer (VNA). The results show that sea urchin-like ZnO spheres (with ZnO whiskers on the surface) can be obtained by ultrasonic treatment. The microwave absorption properties are improved as the number of ZnO whiskers increases.