Chen Meng, Luan Chaoran, Zhang Meng, Rowell Nelson, Willis Maureen, Zhang Chunchun, Wang Shanling, Zhu Xiaohong, Fan Hongsong, Huang Wen, Yu Kui, Liang Bin
School of Chemical Engineering, Sichuan University, Chengdu, Sichuan 610065, P.R. China.
Engineering Research Center in Biomaterials, Sichuan University, Chengdu, Sichuan 610065, P.R. China.
J Phys Chem Lett. 2020 Mar 19;11(6):2230-2240. doi: 10.1021/acs.jpclett.0c00258. Epub 2020 Mar 5.
An approach is reported for the exclusive production of CdTe magic-size clusters (MSCs) that exhibit an optical absorption doublet peaking at 385/427 nm, with an explanation of the synthesis procedure. The MSCs, defined as dMSC-427, were produced from the reaction of cadmium oleate (Cd(OA)) and tri--octylphosphine telluride in octadecene at 100 °C, with the addition of acetic acid (HOAc) or acetate (M(OAc)) during the prenucleation stage (40 °C). Without such an addition or when it was performed in the postnucleation stage (100 °C), quantum dots (QDs) developed. The production of dMSC-427 or QDs is hypothesized to be related to the solubility of the Cd precursor, such as Cd(OA)(OAc) or Cd(OA), respectively. Also, the reactions that lead to Cd(OA)(OAc) are proposed. The present study provides an in-depth understanding of the two-pathway model proposed for the prenucleation stage of binary colloidal QDs, as well as of the formation of MSCs and/or QDs.
报道了一种专门制备碲化镉魔法尺寸团簇（MSCs）的方法，该团簇呈现出在385/427 nm处有峰值的光学吸收双峰，并对合成过程进行了解释。定义为dMSC-427的MSCs是由油酸镉（Cd(OA)）和三辛基膦碲化物在十八烯中于100°C反应生成的，在成核前阶段（40°C）添加乙酸（HOAc）或乙酸盐（M(OAc)）。如果不进行这种添加或在成核后阶段（100°C）进行添加，则会生成量子点（QDs）。据推测，dMSC-427或QDs的生成分别与镉前驱体（如Cd(OA)(OAc)或Cd(OA)）的溶解度有关。此外，还提出了导致生成Cd(OA)(OAc)的反应。本研究深入理解了为二元胶体量子点的成核前阶段提出的双途径模型，以及MSCs和/或QDs的形成。
