油分散性氧化锌纳米微粒的制备及表征

采用直接沉淀法制备了异丁酸修饰纳米氧化锌微粒，用XRD、TEM、XPS、IR、UV-Vis、PL等检测手段对样品进行结构表征。结果表明：所制的样品为纤锌矿结构的氧化锌颗粒，粒度约为20 nm，异丁酸分子与表面锌原子以双齿螯合的形式结合。 Zn(II)2p_3/2的结合能与Zn的标准峰位相比，向低结合能方向移动了1.5 eV，其在可见光区比紫外区的荧光发射显著增强。分散性实验表明，样品在有机溶剂中有良好的分散性。

Preparation and Characterization of Dispersibile ZnO Nanoparticles

Isobutyric acid modified ZnO nanoparticles were prepared by direct precipitation method in water solution. The sample was characterized by TEM, XRD, IR, XPS, UV-Vis, PL. The results show that the nano-ZnO has an average diameter of ca. 20 nm with a hexagonal wurtzite structure, and isobutyric acid molecules coordinate to the surface of ZnO in bindentate modes. The hydrophobic groups formed by the organic layer on the surface of ZnO particles made the nanoparticles have better dispersibility in organic solvent. Moreover, binding energy of Zn2p_3/2 was located at 1 020.3 eV, 1.5 eV lower than that of Zn(II) (1 021.8 eV). A blue-shift in the obsorption band edge of absorption spectrum and an intensive green photoluminescence (PL) band were observed. These effects were caused by interior and organic layer on the surface of ZnO nanoparticle.