A colloidal strategy offers opportunities for the rational design and synthesis of metal telluride nanocrystals (NCs) with the desired crystal structure, uniform geometry, and composition. However, it remains a challenge to use the paradigm to construct metal telluride NCs by a phosphine-free synthesis procedure for promising applications such as luminescence, photovoltaics and thermoelectricity. Here, we developed a new strategy for fabricating metal telluride nanocrystals, e.g. CdTe and PbTe NCs, by using a highly reactive phosphine-free Te precursor. The ability to reduce a TeO₂ powder with dodecanethiol (DDT) has been achieved in the presence of oleylamine (OLA) to generate a soluble alkylammonium telluride at room temperature. We provide direct experimental evidence that the OLA–Te complexes were formed in an order of second magnitude kinetic process based on an in situ UV-vis absorption test. In the case of the CdTe NC system, the straightforward measurement of luminescence and the fabrication of LED devices are presented that can semiquantitatively assess the quality of preparation and the reactivity of this air-stable precursor. The proposed strategy highlights several unique features of this solution-based green chemistry that can be useful for synthesizing other metal telluride NCs to develop novel functional materials.

中文翻译：

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用于合成金属碲化物纳米晶体的无磷工程：在室温下配位的Te前体的作用†

胶体策略为合理设计和合成具有所需晶体结构，均匀几何形状和组成的金属碲化物纳米晶体（NC）提供了机会。然而，使用该范例通过无膦合成程序来构造金属碲化物NC仍然是一个挑战，以用于有希望的应用，例如发光，光伏和热电。在这里，我们开发了一种使用高反应性的无磷化Te的前驱体来制备金属碲化物纳米晶体（例如CdTe和PbTe NCs）的新策略。减少TeO ₂的能力在油胺（OLA）的存在下，已获得具有十二烷硫醇（DDT）的粉末，以在室温下生成可溶的烷基碲化碲。我们提供直接的实验证据，证明了OLA-Te络合物是根据原位UV-vis吸收测试以第二级动力学过程形成的。在CdTe NC系统的情况下，提出了发光的直接测量和LED器件的制造，它们可以半定量地评估这种空气稳定前体的制备质量和反应性。拟议的策略突出了这种基于溶液的绿色化学方法的一些独特功能，这些功能可用于合成其他金属碲化物NC，从而开发出新颖的功能材料。