溶剂热制备花状ZnO纳米晶及光性能表征

利用溶剂热法，以乙酸锌（Zn（CH3COO）2·2H2O）和氢氧化钠（NaOH）为源，在乙二醇和水的混合溶剂中制备出了花状氧化锌纳米晶体，用X射线衍射（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）和选区电子衍射（SAED）测试分析，发现样品为六方纤锌矿结构的ZnO单晶，花状晶体的大小约为600nm，单个花瓣的长、宽分别约为300nm、100nm。对比实验发现，产物形貌对NaOH浓度的依赖性很大。紫外可见吸收光谱（UV—vis spectra）显示，产物除了本征吸收外，在长波方向（600nm处）也有一宽化的、较强的吸收峰。室温荧光光谱（PL spectra）显示，产物在400—480nm有一明显的发光带，且在405nm和472nm处有两个较强的发光峰。

Hydrothermal Synthesis and Optical Properties Characterization of Flowerlike ZnO Nanocrystals

Flowerlike ZnO nanocrystals were synthesized under a hydrothermal condition by Zn（CH3COO）2·2H2O） and NaOH as sources in mixed solution of ethylene glycol and water. The crystal structure and morphology of the final products were characterized by X-ray diffraction（XRD）, scanning electron mieroscopy（SEM）, transmission electron microscopy （TEM） and selected area electron diffraction （SAED） respectively. The results showed that the crystal was ZnO single crystal in wurtzite structure. Flowerlike ZnO nanocrystal was 600nm overall size and the petal was about 300nm length and 100nm width. By comparing the test, found that the morphologies of products depended on the concentration of NaOH obviously. Ultraviolet-visible spectrophotometer （UV-vis spectra） of the product revealed that there was another wide absorption wave crest at 600nm besides the intrinsic absorption. Room photoluminescence spectra（PL spectra） of the product revealed that between 400nm to 480nm there was an emission band and on 405nm and 472nm, there was two strong emission wave crests.