Engineering Research Center in Biomaterials, Sichuan University, Chengdu, 610065 Sichuan, P. R. China.
Analytical and Testing Center, Sichuan University, Chengdu, 610065 Sichuan, P. R. China.
J Phys Chem Lett. 2021 May 20;12(19):4762-4768. doi: 10.1021/acs.jpclett.1c00856. Epub 2021 May 13.
The two-pathway model proposed for colloidal semiconductor metal chalcogenide (ME) quantum dots (QDs) and magic-size clusters (MSCs) is demonstrated for ZnTe. Two new types of ZnTe MSCs have been found, which exhibit sharp optical absorption doublets peaking at 356/389 and 389/420 nm. Labeled dMSC-389 and dMSC-420, respectively, they were produced from reaction mixtures in 1-octadecene (ODE) of zinc oleate (Zn(OA)), tri--octylphosphine telluride (TeTOP), diphenylphosphine (HPPh), and acetic acid (HOAc, CHCOOH). The collective use of HOAc and HPPh enabled the exclusive production of dMSC-389 and dMSC-420 from reaction mixtures that had high Zn-to-Te feed molar ratios and a high Te feed concentration of 60 mmol/kg. The present findings demonstrate the utility of HOAc in synthesizing MSCs displaying a sharp absorption doublet, as well as of a secondary phosphine that decreases the temperature at which the M-E covalent bonds form.
提出的胶体半导体金属硫属化物（ME）量子点（QD）和幻数团簇（MSC）的双路径模型已在 ZnTe 上得到证明。发现了两种新型 ZnTe MSC，它们在 356/389 和 389/420nm 处表现出尖锐的光吸收双峰。分别标记为 dMSC-389 和 dMSC-420，它们是由油酸锌（Zn（OA））、三--辛基膦碲（TeTOP）、二苯基膦（HPPh）和乙酸（HOAc，CHCOOH）在 1-十八烯（ODE）中的反应混合物制备的。HOAc 和 HPPh 的共同使用使得能够从具有高 Zn-to-Te 进料摩尔比和高 60mmol/kg 的 Te 进料浓度的反应混合物中独家制备 dMSC-389 和 dMSC-420。目前的发现证明了 HOAc 在合成显示尖锐吸收双峰的 MSC 以及降低形成 M-E 共价键的温度的二级膦的有用性。
