退火气氛对ZnO纳米颗粒的结构及发光特性的影响

在500℃且不同退火气氛(氮气、氧气)条件下,我们通过化学沉淀法成功制备了ZnO纳米颗粒.采用X射线衍射仪(XRD)、透射电子显微镜(TEM)、光致发光(PL)和拉曼光谱(Raman)研究退火气氛对ZnO纳米颗粒结构和发光特性的影响.实验结果表明,制得样品为具有六角纤锌矿结构的ZnO.从Raman和PL光谱可以观测到,退火气氛对ZnO纳米颗粒的结晶和发光特性都有很大的影响,氮气气氛下退火得到样品发光特性较好,缺陷较少,文中对其影响机制进行了讨论.

Effect of Annealing Atmosphere on the Structure and Optical Properties of ZnO Nanoparticles

ZnO nanoparticles（NPs） had been successfully synthesized by the chemical precipitation method in different atmospheres at 500 ℃. The annealing atmospheres were nitrogen（N2） and oxygen（O2）. The effects of annealing atmosphere on the structure and optical properties of ZnO NPs were investigated in detail by X-ray diffraction,transmission electron microscope,photoluminescence and Raman scattering measurements. The results showed that the as-prepared ZnO NPs had a hexagonal wurtzite structure,and all the samples kept the overall crystal structure of bulk ZnO. From the Raman and photoluminescence spectra,it can be seen that different annealing atmospheres strongly influenced the crystallization and light emission of the ZnO NPs. The results revealed that the nitrogen was the optimal condition for growing the ZnO NPs with the best crystalline quality and optical properties. Moreover,the effect mechanism of annealing atmospheres on the structure and optical properties of ZnO NPs were also investigated.