ZnO纳米晶合成毕业论文.docVIP

花状ZnO纳米晶合成及其光致发光性能研究 学 科： 材料物理与化学 作 者： 刘志强 （签名） 指导教师： 张卫华 （签名） 摘要 本文采用水热法，以氯化锌和氨水为原料，通过改变反应温度，反应环境pH值、锌离子浓度和预置ZnO纳米晶晶核获得不同形貌和尺寸的花状氧化锌纳米晶，实验结果表明：（1）反应温度对氧化锌纳米晶的形貌及单根棒直径有显著影响，反应温度升高将导致花状纳米氧化锌的外径变大，同时单根棒直径变粗。并且随着温度降低有利于制备尺寸均匀的纳米花状氧化锌。（2）锌离子浓度显著影响纳米花状氧化锌的尺寸以及形貌，以及单根棒的尺寸。随着锌离子浓度的增加，花状纳米氧化锌的外径和单根棒的直径都随之显著增大，且花枝数目变多。（3)预置晶核显著影响纳米花状氧化锌的尺寸及形貌，经过预置的氧化锌与预置的晶核相比尺寸明显增大，并且尺寸变得均匀，花型完整。（4）纳米花状氧化锌的激发光谱位于200nm～300nm波段，采用215nm波长光作为激发光，其发射光谱位于400nm～600nm，在466nm左右波长的发光强度最强。随着纳米花状氧化锌棒径尺寸减小，最强峰发光强度增大。当纳米花状氧化锌棒径小于0.5um时，发光强度发生突变，发光强度明显增强。 关键字：水热法；花状氧化锌；纳米晶；预置晶核；光致发光特性 The study of Flower-like ZO crystals hydrothermal synthesis and optical properties Subject：Material physics and chemistry Writer： Zhiqiang Liu （签名） Guider： Weihua Zhang （签名） Abstract y hydrothermal method in this paper, using the chloride zinc and ammonia as raw materials, as well as changing the reaction temperature and reaction value of pH, concentration of zinc ions and preset ZnO nanometer nuclear in order to obtain different morphologies and sizes of flower-like ZnO crystals, the experiment results show that: (1) The reaction of temperature affect a significant appearance of ZnO crystal and diameter of single rod. The increasing of reaction of temperature will lead to a larger outer diameter flower-like ZnO while the diameter of single rod will become thick. Zinc ion concentration significantly affects size and morphology of flower-like ZnO. And with the decreasing of the temperature is favorable to the preparation of uniform size of nanometer zinc oxide. (2) Zinc ion concentration significantly influences the size of flower-like ZnO nanometer and morphology, as well as the dimension of single stick. Along with zinc ion concentration increasing, outer diameter of flower-like ZnO and a single rod will increase extremely, and the number of squids is more. (3) The preset nucleation extremely effect nanometer of flower-like ZnO size and shape, compared the size of preset zinc oxide crystal nucleus with prese