Effect of growth time on photoluminescent properties of zinc oxide nanorods
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摘要: 为了研究氧化锌纳米棒的生长机理,先用脉冲激光沉积方法在玻璃衬底上制备一层氧化锌薄膜作为种子层,然后用水热法在种子层上生长氧化锌纳米棒,研究了不同反应时间对其结构、形貌及发光特性的影响。利用X射线衍射仪和扫描电子显微镜测定样品的结构和形貌,用自组建的光致发光系统对样品的光致发光光谱进行了测量。结果表明,氧化锌纳米棒沿c轴高度取向并呈六角纤锌矿结构;随着生长时间的增加,氧化锌纳米棒结晶质量明显改善,纳米棒均匀、致密性和取向性均提高,样品的缺陷发光增强而激子发光减弱。Abstract: In order to study the growth mechanism of a zinc oxide nanorod.Firstly,thin zinc oxide film was deposited on a glass substrate as a seed layer by pulsed laser deposition.Then,well-aligned zinc oxide nanorod arrays were synthesized with hydrothermal method.Effects of growth time on structure,morphology and photoluminescent properties of zinc oxide nanorods were investigated.The results show that zinc oxide nanorods are hexagonal wurtzite structures and grow along the c-axis.Homogenization,compactness,orientation of zinc oxide nanorods are improved with the growth time.The photoluminescent intensity of defect luminescence is enhanced while the excitation photoluminescence is weakened.
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Keywords:
- thin films /
- zinc oxide nanorod /
- pulsed laser deposition /
- hydrothermal method /
- growth time /
- photoluminescence
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