Shape control of CdS nanocrystals in one-pot synthesis
Shape control of CdS nanocrystals in one-pot synthesis
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DOI：
10.1021/jp066392z
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发表时间：
2007-02-15
影响因子：
3.7
通讯作者：
Prasad, Paras N.
中科院分区：
文献类型：
--
作者：
Yong, Ken-Tye;Sahoo, Yudhisthira;Prasad, Paras N.
我们在这里报告简单的溶液相的方法制备CdS纳米粒子与各种各样的形态，开始与油胺作为表面活性剂或封端剂，并改变反应条件。我们系统地研究了温度、前驱体浓度、生长时间、添加金属纳米粒子、添加助表面活性剂以及酸化反应介质对CdS纳米粒子生长的影响。这些参数对纳米晶体的形态具有巨大的影响，允许控制合成一系列形状，包括纳米棒、二脚架、三脚架、四脚架、纳米立方体、纳米线、链状纳米结构和纳米片。在100摄氏度下，在没有二次添加剂的情况下，我们观察到锌共混物CdS核心的成核，随后是纤锌矿臂的生长，以产生杆、二脚架和三脚架。十四烷基膦酸的加入抑制了纤锌矿臂的生长，得到了锌共混物立方纳米晶体。金纳米粒子的加入或反应介质的酸化导致纤锌矿多晶型物的成核和各向异性生长。
We report here straightforward solution-phase methods of preparing CdS NCs with a wide variety of morphologies, starting with oleylamine as the surfactant or capping agent, and varying the reaction conditions. We have systematically investigated the effects of temperature, precursor concentration, growth time, addition of metal nanoparticles, addition of cosurfactants, and acidification of the reaction medium on the growth of CdS NCs. These parameters have a tremendous impact on the morphology of the nanocrystals, allowing the controlled synthesis of a series of shapes including nanorods, bipods, tripods, tetrapods, nanocubes, nanowires, chain-like nanostructures, and nanoplatelets. At 100 degrees C, in the absence of secondary additives, we observed the nucleation of zinc blend CdS cores, followed by the growth of wurtzite arms to produce rods, bipods, and tripods. The addition of tetradecylphosphonic acid suppressed the growth of the wurtzite arms, resulting in zinc blend cubic nanocrystals. The addition of gold nanoparticles or acidification of the reaction medium led to nucleation and anisotropic growth of the wurtzite polymorph.