不同形貌氧化锌的微波电磁性能研究

采用碳还原剂控制法制备了六方晶系纤锌矿结构四脚状氧化锌晶须,使用硬脂酸溶胶-凝胶(sol-gel)燃烧法制备了球形氧化锌纳米晶体.使用波导法对所得到的产物以及体相氧化锌材料进行了磁导率和介电常数的测量.结果表明,在8~12 GHz的测试范围内,四脚状氧化锌晶须、氧化锌纳米晶体以及体相氧化锌的介电损耗随频率的增加变化不明显.微波电磁性能试验表明,四脚状氧化锌晶须以及氧化锌纳米晶体是一种介电损耗材料,具有一定的微波吸收性能,并且四脚状氧化锌晶须的介电损耗大于氧化锌纳米晶体.体相氧化锌材料在这个频率范围内基本没有电磁损耗. 

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 acidsol-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 tetrapod-shaped ZnO (T-ZnO) whiskers and the ZnO nanocrystals were not obvious with the frequency in the range of 8~12 GHz. It was demonstrated that the tetrapod-shaped ZnO (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 range of frequency 8~12 GHz.