Electromagnetic characteristics of different shape ZnO composite

Tetrapod-shaped ZnO whiskers (T-ZnO) with the structure of hexagonal cross sections were prepared by using the control method of carbon-reducing agent. The spherical-shaped ZnO nanocrystals were synthesized by using stearic acid sol-gel combustion technique. The dielectric constants and magnetic constants of the products were studied by using the waveguide method of electromagnetic characteristics. It was shown that the increments of both dielectric loss and magnetic loss of T-ZnO whiskers and the ZnO nanocrystals were not obvious with the frequency of 8-12 GHz. It was demonstrated that the T-ZnO whiskers and the ZnO nanocrystals were the materials with the performance of dielectric dissipation by the experiment of microwave electromagnetic characteristics, and the dielectric dissipation of T-ZnO was higher than that of nanosized ZnO. It was not found that the bulk materials of ZnO had the electromagnetic dissipation performance in the frequency of 8-12 GHz.