微波法合成多种形貌氧化锌

本文通过一种简捷的微波合成方法在不同溶剂中得到了花状、刺球状、多角星状的氧化锌结构.X射线衍射表明,产物为结晶良好的纤锌矿氧化锌.在水、水/乙醇、水/丙醇3种体系中得到的产物呈现由纳米棒组成的花状结构;在水/乙二醇中得到刺球状氧化锌结构;在水中,当反应物浓度降低时,花状结构转变为多角星状结构.荧光光谱研究表明,水中产物的激发峰和发射峰出现在243 nm和398 nm,使用混合溶剂可使产物荧光发射增强,降低反应物浓度也可导致荧光增强.

Microwave-Assisted Method for the Preparation of ZnO with Various Morphologies

Flower-,thornball-,and polygonal star-like ZnO nanostructres were synthesized in different solvents by a simple microwave-assisted synthesis method.The XRD patterns show,as-prepared ZnO particles are highly crystallized single crystal with a wurtzite structure.Nanorods with flower-like structure were formed in water,water/ethanol and water/propanol system,while ball-shape structure was obtained in water/glycol system.Decreasing reactant concentrations in water led to the formation of polygonal star-like structure.Photoluminescence spectra show that the excitation and emission peaks appear at 243 nm and 398 nm,respectively.The introduction of alcohol in the mixed solvents could result in an enhancement of emission intensity,which could also be achieved by reducing the concentration of reactants.