微波加热制备大尺寸ZnO晶须的研究

Research on the Large ZnO Whiskers Growth by Microwave Thermal Evaporation Deposition

以微米氧化锌为原料,采用微波合成技术制备氧化锌晶须。XRD结果表明产物为六方纤锌矿结构。SEM照片显示晶体为管状和棒状,直径约50μm,长度约500μm。利用室温下光致发光光谱对晶体光学性能进行表征,晶须在室温下具有360 nm的紫外发射和470 nm蓝光发射。工艺研究表明:合适的温度场是晶须生长的关键,微波加热与传统方法的温度场不同。

ZnO whiskers were grown by a simple vapor-phase approach by using microwave energy without any catalyst in a very short time. The result of the XRD indicates that the production structure was wurtzite. The SEM shows some are rod crystals, the other are tubes with 50 μm diameter and 500μm length. The photoluminescence （PL） exhibits strong ultraviolet emission （wavelength is 360 nm） and blue emission （wavelength is 470 nm） at room temperature. Experiments indicate that the temperature gradient is very important for the ZnO whiskers growth by using vapor phase. The temperature gradient between conventional and microwave heating is different.