Hydrothermal synthesis and dielectric properties of chrysanthemum-like ZnO particles

By orthogonal design theory,technological parameters of chrysanthemum-like ZnO particles prepared in a hydrothermal process are optimized.This paper reports a set of technological parameters for growing chrysanthemumlike ZnO particles on a large scale.It investigates the morphologies and crystalline structures of the as-synthesized three-dimensional ZnO particles with a scanning electron microscope,x-ray diffractometer and transmission electron microscope,and the possible growth mechanism on the three-dimensional ZnO particles.The experimental results indicate that the values of ε,ε and tan δe gradually increase in the X band with the improvement of the developmental level of chrysanthemum-like ZnO particles,implying that the electromagnetic wave absorbing property depends on the morphologies of three-dimensional ZnO particles.