一锅合成绿色到近红外发射的CdTe量子点

One-Pot Synthesis of Green-to Near Infrared-Emitting CdTe Quantum Dots

以3-巯基丙酸(MPA)为稳定剂,采用水相合成法制备了从绿色到近红外发射的CdTe量子点。系统研究了反应液pH值、镉和碲的物质的量之比及镉和3-巯基丙酸的物质的量之比等实验条件对CdTe量子点体系的发射波长和荧光量子产率的影响。在pH值为10.5,且nCd2+∶nTe2-∶nMPA=1∶0.05∶1.1的条件下,回流0.5 h,CdTe量子点体系在569 nm波长处的荧光量子产率达到30.8%;在7 h的回流时间内,制备的量子点的波长覆盖范围为525～730 nm。分别用X射线粉末衍射、透射电镜和红外光谱对CdTe量子点的晶体结构、形貌及表面基团进行表征。

Abstract： CdTe quantum dots （QDs） with emission wavelength from green to near infrared is synthesized in aqueous phase when mercaptopropionic acid （MPA） acts as capping reagent. The effects of pH of reaction solution, molarratios of ncd/ nto and ncd/nMPA on the emission peak and photoluminescence （PL） quantum yield （QY） of CdTe Q Ds are investigated, respectively. It is found that 30.8% of PL QY is achieved for CdTe at 569 nm when reaction system is refluxed for 0.5 h at pH 10.5, and ncd^2＋：nTe^2-：nMPA=1：O.05：1.1. By controlling the reflux time within 7 hrs, the PLemission peak range of CdTe quantum dots in morphology and surface groups of CdTe QDs are electron microscopy （TEM） and Fourier transform aqueous solution is from 525 to 730 nm. The crystal structure, characterized using X-ray powder diffraction （XRD）, transmission infrared spectroscopy （FTIR）, individually