双盘状ZnO的可控制备

采用水热法制备了形貌可控、 尺寸均一的双盘状ZnO. X射线粉末衍射(XRD)、 扫描电子显微镜(SEM)及透射电子显微镜(TEM)等测试结果表明, 制备的ZnO具有六方纤锌矿结构, 由2个直径约为4 μm, 厚度约为600 nm的圆盘复合而成. 考察了反应温度和乙酸锌与柠檬酸钾的摩尔比对产物形貌与尺寸的影响, 实现了双盘状ZnO的可控合成, 并初步探讨了其形成机理. 荧光光谱显示, 双盘状ZnO的紫外发射峰半高宽约为10 nm, 比块体ZnO的紫外发射峰半高宽(18 nm)窄, 表明双盘状ZnO具有更好的光学特性.

Controlled-preparation of Twined Plate-like ZnO

Twined plate-like ZnO crystals were prepared by hydrothermal method with the help of zinc acetate and potassium citrate.XRD,TEM,SEM,SAED,EDX and photoluminescence spectra were employed to characterize the crystal phase,morphologies,the chemical compositions and photoluminescence properties of the ZnO samples.The growth mechanism of ZnO was tentatively investigated.The obtained twined plate-like product is about 4 μm in diameter and 600 nm in thickness,which is wurtzite hexagonal structure ZnO.The experimental results show that the molar ratio of zinc acetate to potassium citrate and reaction temperature have greater influences on the morphology of ZnO,and potassium citrate plays a key role in modulating the morpho-logy of ZnO.The controlled-preparation of ZnO can be successfully achieved by regulating the molar ratio of zinc acetate to potassium citrate.Furthermore,the twined plate-like ZnO exhibit excellent optical property.