论文部分内容阅读
采用溶胶–凝胶法制备了ZnO量子点,并采用有机高分子试剂PEG(聚乙二醇,Mw=2000)对其表面进行修饰。借助X射线衍射分析、傅立叶红外光谱、光致发光谱和透射显微镜等测试方法,研究了PEG表面修饰对ZnO量子点结构和光学性能的影响规律。研究表明,混合加入的PEG聚合物能够成功地包覆在ZnO量子点表面,但没有改变量子点的晶体结构,经PEG表面修饰后的ZnO量子点尺寸变小,稳定性增强,分散更均匀。同时经PEG修饰的ZnO量子点在400~500 nm波长区域缺陷态发射峰明显减弱,表明采用PEG来改善ZnO量子点表面缺陷结构具有良好效果。
ZnO quantum dots were prepared by sol-gel method, and their surface was modified by organic polymer PEG (polyethylene glycol, Mw = 2000). The influence of PEG surface modification on the structure and optical properties of ZnO quantum dots was investigated by X-ray diffraction analysis, Fourier transform infrared spectroscopy, photoluminescence spectroscopy and transmission electron microscopy. The results show that the PEG polymer can be successfully coated on the surface of ZnO quantum dots without changing the crystal structure of the quantum dots. The size of the ZnO quantum dots modified by PEG surface becomes smaller and the stability is enhanced and the dispersion is more uniform. At the same time, the emission peak of the defect state of ZnO quantum dots modified by PEG at 400 ~ 500 nm is obviously weakened, which shows that PEG has good effect on improving the surface defect structure of ZnO quantum dots.