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A surfactant-free recipe for shape-controlled synthesis of CdSe nanocrystals

机译：用于CdSe纳米晶体形状控制合成的无表面活性剂配方

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摘要

We described surfactant-free recipes for the synthesis of CdSe nanocrystals (NCs) with well-controlled morphologies at a relatively low temperature. Dot-, rod-, tetrapod-and sphere-shaped CdSe NCs were prepared with trioctylphosphine oxide (TOPO) as a non-equilibrium solvent and trioctylphosphine selenide (TOPSe) and cadmium carboxylates as Se and Cd precursors, respectively. It was found that the morphology and stacking pattern of the CdSe NCs were related to the preparation conditions such as the concentration of the injected TOPSe(monomer concentration), reaction temperature and chain length of the cadmium carboxylate precursors. At a reaction temperature of 240 °C, CdSe NCs with a tetrapod selectivity of up to 85% were obtained in the presence of cadmium myristate under high concentrated TOPSe injection, and the in situ-formed myristic acid supplied the best acidic ligand with optimal amount to stabilize the anisotropic growth of the tetrapods. The intentional addition of more myristic acid in the reaction system would block the growth pathway of the tetrapods. Using cadmium laurate, cadmium palmitate and cadmium stearate as the cadmium precursors would reduce the formation of the tetrapods, showing the very low selectivity of the tetrapods.
机译：我们描述了在相对较低的温度下合成形态良好控制的CdSe纳米晶体（NC）的无表面活性剂配方。用三辛基膦氧化物（TOPO）作为非平衡溶剂，三辛基膦硒化物（TOPSe）和羧酸镉作为硒和镉的前驱体，分别制备了点状，棒状，四足状和球形的CdSe NCs。研究发现，CdSe NCs的形貌和堆积方式与制备条件有关，例如注入的TOPSe的浓度（单体浓度），反应温度和羧酸镉前体的链长。在240°C的反应温度下，在高浓缩TOPSe注入下，在肉豆蔻酸镉的存在下，可获得四脚架选择性高达85％的CdSe NCs，并且原位形成的肉豆蔻酸提供了最佳量的最佳酸性配体稳定四足动物的各向异性生长。在反应系统中故意添加更多的肉豆蔻酸会阻碍四足动物的生长途径。使用月桂酸镉，棕榈酸镉和硬脂酸镉作为镉前体会减少四足动物的形成，显示出四足动物的选择性非常低。

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