低温固相反应法合成ZnO纳米晶体

乙酸锌和草酸为原料，采用低温固相反应法制备纳米了ZnO。采用扫描电子显微镜(SEM)、X射线衍射仪(XRD)、傅里叶红外光谱仪(FT-IR)，光致发光（PL)光谱对所制备的纳米ZnO进行了表征。结果表明：制备的纳米ZnO的粒径为15~25nm左右，六方晶系纤锌矿结构，形貌为类球形。研究了改变工艺条件中研磨时间和水浴温度对合成样品的结构、形貌的影响。发现随着研磨时间的延长，样品的结晶性增强。水浴温度的变化对纳米粒子的结晶性及尺寸有一定的影响。纳米氧化锌由于其对紫外线的高吸收率和可将紫外线转换为可见光而作为近紫外LED光转换材料有着潜在的应用。

Preparation of ZnO Nano-crystalline by Solid State Reaction at Low Temperature

ZnO nanocrystals were synthesized by solid state reaction method at low temperature.Zinc acetate and oxalic acid were used as starting materials.The synthesized samples were analyzed by X-ray diffractometer(XRD),scanning electron microscopy(SEM),Fourier transform infrared spectroscopy(FT-IR) and photoluminescence(PL).The results show that the spherical-like nano-crystals has a grain size of approximately 15-25nm,with a hexagonal wurtzite structure.The effect of grinding time and the water bath temperature on the structure and morphology of samples were studied.It is found that the longer the time of grinding get better crystallinity of the sample and the water bath temperature influences the crystallinity and size of nanoparticles.ZnO nanocrystals has potential applications in the near-ultraviolet(UV) LED light conversion material due to its high UV absorption rate and emission of visible light under UV excitation.