ZnO纳米片的制备及光学性质研究

本文利用化学浴沉积法制备了片状氧化锌纳米粒子。在室温下,利用X射线衍射谱,扫描电镜和光致发光谱对氧化锌纳米片进行了表征。结果表明,氧化锌纳米片最强的衍射峰与<001>晶面相对应,显示出与普通氧化锌不同的明显的择优取向;片状氧化锌的尺寸为1000 nm×600 nm×60 nm;结果显示,刚制备的氧化锌的光谱包括一个紫外发光峰和一个蓝绿发光峰。片状氧化锌的生长分两个阶段:第一阶段,大量的乙酸锌前驱体在75℃通过水热分解反应沉积为氧化锌;第二阶段,氧化锌在低温下溶解,也称为老化阶段。

THE FABRICATION AND PHOTOLUMINESCENCE PROPERTY OF ZNO NANOSHEETS

In this thesis, sheet-shaped zinc oxide nano-particles were prepared by chemical bath deposition method. The zinc oxide nanosheets were characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM） and photolumineseence spectrum （PL） at room temperature. The strongest diffraction apex of the nanosheet-shaped zinc oxide is assigned to 〈 001 〉 crystal planes and exhibits obvious preferred orientation which is different from that of the general zinc oxide. The results show that ZnO nanosheets with about 1000nm x 600nm ~ 60 nm are obtained. The result shows the PL spectra of the as-grown products contains a violet band and a blue-green band. The growth process of ZnO nanosheets could be divided into two stages. The first stage corresponds to the transformation of a large amount of the precursor Zn （ CH3 COO） 2 into ZnO deposition through hydrothermal decomposition at a higher temperature of 75℃. The second stage is called the ageing process, which corresponds to the dissolution of ZnO at lower temperature.