摘要
采用水相回流法制备出光谱可调的CdTe/CdS量子点,分别用透射电子显微镜(TEM)、能谱色散仪(EDS)、荧光分光光度仪对其形貌性能进行表征。用氨基聚倍半硅氧烷(NH_2-POSS)功能化CdTe/CdS量子点使其带有正电荷,再与带负电荷的Fe_3O_4磁性纳米粒子进行静电自组装,最终制备出磁性荧光复合材料(Fe_3O_4-CdTe/CdS)。并对量子点与氨基聚倍半硅氧烷的质量比、量子点与Fe_3O_4的质量比以及三者不同的组装顺序进行优化。结果表明,当量子点与氨基聚倍半硅氧烷和Fe_3O_4的质量比分别为6∶1和20∶1、组装顺序为量子点-氨基聚倍半硅氧烷-Fe_3O_4时得到复合材料的性能最佳。
The spectral adjustable CdTe/CdS quantum dots are prepared by aqueous phase refluxing method. The prepared quantum dots are characterized by transmission electron microscopy（ TEM）,energy dispersive spectrometer（ EDS） and fluorescence spectrophotometer.Amino-polysilsesquioxanes（ NH2-POSS） is used to functionalize CdTe/CdS quantum dots,making them bring with positive charges.Finally,magnetic fluorescent composites（ Fe3O4-CdTe/CdS） are synthesized through electrostatic self-assembling the functionalized CdTe/CdS quantum dots with negatively charged Fe3O4 magnetic nanoparticles.The mass ratios of quantum dots to NH2-POSS and quantum dots to Fe3O4 as well as the different assembly sequences among quantum dots,NH2-POSS and Fe3O4 are optimized. The results show that when the mass ratio of quantum dots to NH2-POSS is 6 ∶ 1,that of quantum dots to Fe3O4 is 20 ∶ 1,and the assembly order is quantum dot at first,then NH2-POSS and finally Fe3O4,the composites will have the best performance.
出处
《现代化工》
CAS
CSCD
北大核心
2018年第1期76-79,共4页
Modern Chemical Industry
基金
国家自然科学基金(21475095
21506161)
