Synthesis and Optical Properties of Water-Soluble CdTe:Zn2+ Quantum Dots Prepared by the One-Pot Approach

This paper reports the synthesis and characterization of ternary CdTe:Zn2+ quantum dots (QDs) passivated with reduced L-glutathione (GSH) dispersed in water. The synthesis was performed through a one-pot approach and their size-dependent optical properties were investigated through steady-state absorption and emission spectroscopies along with the evolving factor analysis/multivariate curve resolution alternating least squares (EFA/MCR-ALS) method. Our results show that the incorporation of Zn2+ ions in CdTe:Zn2+ QDs, during the synthesis time, decreases the CdTe:Zn2+ QDs predominant diameter in the ensemble and increases their size dispersion. In addition, fluorescence quantum yield measurements suggest a reduction in the number of surface defects in CdTe:Zn2+ QDs as compared with CdTe QDs, when both are produced from the same synthesis route.

本论文报道了水相分散、经还原型L-谷胱甘肽（reduced L-glutathione, GSH）钝化的三元CdTe:Zn²⁺量子点（quantum dots, QDs）的合成与表征。本研究采用一锅法完成合成，并通过稳态吸收与发射光谱，结合演化因子分析/多元曲线分辨-交替最小二乘法（evolving factor analysis/multivariate curve resolution alternating least squares, EFA/MCR-ALS），探究了其尺寸依赖的光学特性。研究结果表明，在合成过程中向CdTe:Zn²⁺量子点中掺入Zn²⁺离子，会降低该体系中CdTe:Zn²⁺量子点的主导粒径，并增大其尺寸分散度。此外，荧光量子产率测试结果显示，采用相同合成路线制备的CdTe:Zn²⁺量子点，相较于纯CdTe量子点，其表面缺陷数量有所减少。