单分散ZnO微球的合成及表征

以Zn(NO3)2.6H2O为前驱体,采用水热法在三乙醇胺和水的混合溶剂中合成了单分散的ZnO微球。采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)对ZnO微球进行表征。结果表明制备的样品具有六角纤锌矿结构,单分散的ZnO微球是由几十纳米的小颗粒聚集形成的。样品的形貌与三乙醇胺含量和前驱体浓度密切相关。随着三乙醇胺含量的增加,ZnO由不规则形状的颗粒转变为球形颗粒。此外,随着前驱体浓度增大,ZnO的形貌由球状变为六棱柱状。因此,要合成单分散的ZnO微球必须要严格控制前驱体浓度和三乙醇胺的含量。

Synthesis and Characterization of Monodispersed ZnO Microsphere

Monodispersed ZnO microsphere was synthesized via hydrothermal method using Zn(NO3)2 as precursors and triethanolamine (TEA) aqueous solution as solvent. The samples were characterized by X ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. The results show that the diffraction peaks belong to the typical ZnO wurtzite structure and ZnO microsphere is composed of tens of nanometer nanoparticles. The morphology of the samples strongly depends on the content of TEA and concentration of precursor. The irregular particles changes to sphere shape with the increased TEA content. In addition, the morphology varies from sphere to hexagon prism as the concentration of precursor increased. Therefore, the concentration of precursor and TEA content should be accurately controlled to synthesize monodispersed ZnO microsphere.