Ce掺杂ZnO螺丝刀状纳米材料的制备及其光学特性研究

Preparation and optical properties of Ce-doped ZnO screwdriver nanomaterial

采用溶胶-凝胶和化学气相沉积相结合的方法,制备一种Ce掺杂ZnO纳米材料,对其结构、形貌、能带结构和发光特性等进行分析,结果表明:该纳米材料形状类似螺丝刀,由六方微米基底和纳米棒顶两部分组成,具有很好的单晶结构;其制备过程符合VLS生长机制,且Zn和Ce蒸气浓度对各个晶面的生长速度有非常大的影响;与纯ZnO纳米材料相比,该纳米材料中的Zn2p3/2峰向低能级转移,而O1s峰向高能级转移,Ce的掺杂影响了ZnO的电子结构和带隙结构;其紫外发射峰强度降低并伴有红移,且绿光发射强度得到提高.该方法制备的纳米材料,在组装纳米器件方面有很好的应用前景.

A Ce-doped ZnO nanomaterial was prepared by a simple method of sol-gel and chemical vapor deposition. The structure, morphology, band structure and luminescence properties of the ZnO nanomaterials were analyzed. The results showed that the nanomaterial was similar to a screwdriver,and consisted of a hexagonal micron substrate and a nanorod top. It had a good single crystal structure;its preparation process conformed to the VLS growth mechanism, and the vapor concentrations of Zn and Ce had a very large influence on the growth rate of each crystal face;Compared with ZnO nanomaterials, the Zn 2p 3/2 peak in the nanomaterials shifted to a lower energy level, while the O1s peak shifted to a higher energy level. The doping of Ce affected the electronic structure and band gap structure of ZnO;its UV emission peak was reduced and accompanied by red shift, and the intensity of green light emission was improved. The nanomaterial prepared has a good application prospect in assembling nanodevices .