摘要
利用3-巯丙基三乙氧基硅烷对ZnO进行表面修饰后沉积SiO2,制备出水溶性SiO2包覆ZnO的量子点.与直接采用正硅酸乙酯沉积包覆SiO2的ZnO量子点相比,362 nm处的激子荧光发射峰的强度提高了将近4倍.由于表面引入了巯基官能团,量子点的水溶性明显提高,稳定性增强,即使在较高的盐浓度下也不会团聚.通过改变条件,制备出了发光波长在420 nm的蓝色荧光量子点.
SiO2/ZnO water-soluble quantum dots were prepared by modification of （3-mercaptopropyl）triethoxysilicane. The emission spectral peak of exciton fluorescence was raised by about 4 times in comparison with that of the quantum dots obtained by direct SiO2 deposit on ZnO without modification. The introduction of hydrosulfide group（HS--） on ZnO, renders the quantum dots good water solubility, unique fluorescent stability and anti-congregation even at higher NaC1 concentration. The water soluble blue SiO2/ZnO quantum dots were also prepared by this method with some modification of the reaction conditions. The photogenic wavelength of this blue quantum dots was found to be 420 nm. The emission spectra were very symmetrical without obvious red tail. The full widths half maximum were only 46 nm.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2007年第12期2246-2251,共6页
Chemical Journal of Chinese Universities
基金
国家自然科学基金(批准号:202171042)
国家电分析化学重点实验室基金(批准号:2005007)
四川省科技厅项目(批准号:03GG009-024)资助
关键词
氧化锌
水溶性量子点
表面包覆
光学性质
ZnO
Water-soluble quantum dot
Surface coating
Optic property
