【摘要】 用硫普罗宁(tiopronin,TP)作为稳定剂,在水相中合成了荧光发射波长可调的高荧光CdTe量子点。本文详细地研究了稳定剂与Cd之比和pH值等实验条件对CdTe纳米粒子体系的荧光量子产率的影响。在pH=11.3回流2 h,纳米粒子体系在537 nm波长处的荧光量子产率达到了66%。通过控制实验条件,合成了各种尺寸的CdTe量子点,荧光发射光谱在504~602 nm范围连续可调。分别用X射线光电子能谱(XPS)、透射电子显微镜(TEM)、X射线衍射(XRD)、红外吸收光谱(FTIR)表征了CdTe粒子的分散性、形貌和晶型。溶血实验显示,这些由硫普罗宁稳定的CdTe量子点几乎不发生溶血作用(溶血率低于5%),具有良好的生物相容性。更多还原

【Abstract】 The water-soluble CdTe quantum dots have been synthesized by using tiopronin(TP) as stabilizer in aqueous solution at 100 ℃.The experimental results demonstrate that several parameters including pH and molar ratios of the TP ligands to the concentration of Cd2+ ions in the precursor solution play an important role in the photoluminescence(PL) quantum yield(QY) of the as-prepared CdTe quantum dots(QDs).Refluxing for 2 h at pH= 11.3,the maximum PL QY of the obtained CdTe QDs at 537 nm is 66% at room temperature without any post-preparative treatment.By controlling the reflux time,CdTe quantum dots with various sizes can be obtained in aqueous solution.The room-temperature PL emission spectrum of CdTe quantum dots in aqueous solution covers the spectral region from 504 to 602 nm with a maximum located at 537 nm.TEM,XRD,XPS and FTIR spectroscopy are used to characterize the size,shape,and composition of the CdTe nanocrystals.The hemolysis assay shows that the TP-capped CdTe quantum dots have good biocompatibility.更多还原