低温合成纳米氧化锌及其光学性能研究

Synthesis and Optical Properties of Nano-ZnO at Low Temperature

为了研究ZnO的光学特性随溶液浓度变化的规律,采用水热法在低温条件下合成了具有六方纤锌矿结构的纳米ZnO材料。分别对样品的形貌、结构、光学特性进行了表征和分析。研究结果表明,纳米ZnO沿着(002)晶面择优生长,生长机理分析表明络合离子Zn(OH)2-4是纳米ZnO的生长基元,样品形貌的形成受到溶液的浓度、温度、反应时间等因素的影响。随着OH-与Zn^(2+)浓度比的增大,样品由棒状结构变为片状形态,并出现了团聚现象。光致发光谱表明,样品具有优异的红绿光发射能力,在560nm波长附近具有明显的可见光发射带,在374nm附近具有一个明显的紫外发射峰。最后讨论了样品的发光机理。

In order to explore the rule of optical properties of ZnO changing with the concentration of solution,nanoZnO with hexagonal wurtzite structure is synthesized by hydrothermal method at low temperature.Then,the morphology,structure and optical properties of the samples are characterized,respectively.The results indicate that nano-ZnO grows preferentially along the（002）plane.And complex of Zn（OH）4^2- is the growth element of nanoZnO.The morphology of the samples is influenced by the concentration,temperature and reaction time of the solution.As the concentration ratio of OH- and Zn^2＋ increases,the sample changes from the rod-like structure to the flaky form,and the phenomenon of reunion appears.Photoluminescence（PL）spectra shows that the sample has fine emission ability in red to green band,and it has not only an obvious visible emission band near the wavelength of 560 nm,but also a ultraviolet emission peak near 374 nm.Finally,the luminescence mechanism of the sample is discussed.