片状纳米氧化锌的制备及其光学性能的研究

NANOCRYSTALLINE ZnO SHEETS:PREPARATION AND PHOTOLUMINESCENCE PROPERTY

采用三种不同前驱体，以三聚磷酸钠为表面改性剂，水热法制备了少有报导的片状纳米ZnO，采用X-射线衍射仪、透射电镜、荧光光谱仪及紫外可见分光光度计等手段对所得粉末进行表征。结果表明：当pH值为9～10，180℃水热反应一定时间，三种前驱体均可制得片状结构ZnO晶体，片状ZnO晶体（001）晶面衍射峰最强，具有明显的择优性，这与其它形态的ZnO有所不同；以碱式硫酸锌为前驱体时，可获得具有良好紫外吸收性能，并在421nm附近具有单一较强蓝光发光峰的ZnO粉；而以碱式氯化锌、碱式硝酸锌等为前驱体时ZnO则具有383nm附近的紫外发光和571nm左右的黄绿色发光。

Preparation of nano ZnO using different precursors was studied in this paper. Sheet-shaped zinc oxide nano particles were prepared by hydrothermal method in the presence of Na5P3O10 as surface modifier. Zinc oxide nanopowders were characterized by XRD, TEM, fluorescence spectrophotometer and UV-Vis spectrophotometer. The results show that the nano sheet-shaped zinc oxide can be fabricated from the three species of precursors at pH=9-10 when hydrothermally treated at 180℃ for a certain time. The strongest diffraction apex of the nano sheet-shaped zinc oxide is assigned to {001} crystal planes and exhibits obvious preferred orientation, which is different from that of the general zinc oxide. The sheet-like zinc oxide nanopowders from basic zinc sulfate have a good UV-Vis absorbing property and a blue emission band centered at 421 nm. PL spectra reveal that the ZnO nanosheets prepared in the cases of ZnCl2 and Zn （NO3）2·6H2O have two emission peaks centered at 383 nm （UV） and 571 nm （green）.