催化剂对热蒸发CVD法生长β-Ga_2O_3纳米材料的结构及发光特性的影响

Influence of Catalyst on The Structure and Photoluminescence of β-Ga_2O_3 Nano-material by Thermal Evaporation

用热蒸发CVD法制备了β-Ga2O3纳米材料,探讨了Au催化剂对纳米结构和形貌的影响,并研究了其光致发光特性。X射线衍射(XRD)分析显示产物为单斜结构的β-Ga2O3。扫描电子显微镜(SEM)测试表明:Au催化剂颗粒尺寸较小时,制备的产物为尺度均匀的β-Ga2O3纳米线,宽度小于100 nm,长度为几微米至几十微米;增加催化剂颗粒尺寸时,制备出的β-Ga2O3纳米结构的尺度变大,形貌由纳米线逐步形成纳米带、片等形状。β-Ga2O3纳米结构在波长516 nm处有很强的绿光发光带,而且随着催化剂颗粒尺寸的增加,发光强度和峰位'红移'现象逐渐减弱。

The beta-gallium-oxide （β-Ga203 ） nano-material was prepared from gallium and oxygen by thermal evaporation in the argon atmosphere. The X-ray diffraction （XRD） reveals that the syn- thesized products are monoclinic gallium oxide. When the sizes of Au catalysts are small, the breadths of the nanowires are less than 100 nm and the lengths are several micrometers . With the increasing of the catalyst particle sizes, the morphology of the products are gradually transformed into nanobehs, sheets and other shapes. β-Ga203 has stable emission at 516 nm under excitation of 325 nm. With the increasing of the catalyst particle sizes, the luminescence intensity and the red-shift are gradually weakened.