两步法生长ZnO纳米棒的结构及其发光特性

应用两步法在玻璃衬底上制备了高度取向的ZnO纳米棒,并研究了衬底和反应时间等参数对其结构及发光特性的影响。从样品的扫描电镜(SEM)图中发现,利用脉冲激光沉积(PLD)方法在玻璃衬底上生长一层ZnO薄膜作为修饰层,可以明显提高水热法生长的ZnO纳米棒的结晶质量。样品的SEM和光致发光(PL)谱表明,在有ZnO修饰层的玻璃衬底上生长的ZnO纳米棒分布均匀,排列致密,取向性好;缺陷发光的发光强度约是激子发光峰的2倍,且随着反应时间增长,样品的缺陷发光增强而激子发光减弱。

Structure and photoluminescence properties of ZnO nanorods grown by the two-step method

The highly oriented ZnO nanorods are prepared on the glass substrate by the two-step method,and the effects of parameters like substrate and reaction time on the structure and photoluminescence of ZnO nanorods are investigsted.From the SEM photographs,as the modified layer,the ZnO thin film grown on the glass substrate by PLD can improve the crystal quality of ZnO nanorods by the hydrothermal method obviously.The PL spectrum and SEM photographs show that ZnO nanorods grown on the glass substrate with ZnO modified layer have uniform distribution,compact arrangement and good orientation.The photoluminescence intensity of defect luminescence is two times of that of exciton emission peaks.As the reaction time increases,the photoluminescence intensity of defect luminescence is enhanced but the exciton photoluminescence is weakened.