Nanomaterials that feature multiphase dictated by corresponding thermodynamic or kinetic conditions demonstrate great diversity for the exploration of novel properties like photovoltaics or thermoelectricity. To access a specific phase, especially those with a metastable nature, requires effective means to harness the determining parameters ruled by the intrinsic phase diagram. In this report, we develop a solvothermal model that is able to accurately tune the oxidation state of the metal ions in a sulfide system Cu-Sb-S, which in turn effectively regulates the phase evolution process to achieve the expected product (nanoparticles or film) in a phase pure form at a low temperature. The systematic in-situ and control investigations on different transient states illustrate the function of specific chemical groups in thiourea. Such an approach represents a general engineering method that can be readily employed in different systems, such as the Cu-Fe-S system. Furthermore, this one-pot synthetic strategy is capable of fine-tuning mix-phase sulfide nanocomposites as well. Therefore, it provides a platform to research sulfide’s phase-tunable properties, performance, and applications.

中文翻译：

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硫脲介导溶液中硫化物纳米晶体的相控制

具有由相应热力学或动力学条件决定的多相特征的纳米材料在探索光伏或热电等新特性方面表现出巨大的多样性。要访问特定的相，尤其是具有亚稳态性质的相，需要有效的方法来利用由本征相图决定的参数。在本报告中，我们开发了一种溶剂热模型，能够精确调节硫化物体系Cu-Sb-S中金属离子的氧化态，从而有效调节相演化过程以实现预期产物（纳米粒子或薄膜） ）在低温下呈纯相形式。对不同瞬态的系统原位和控制研究说明了硫脲中特定化学基团的功能。这种方法代表了一种通用的工程方法，可以很容易地应用于不同的系统，例如 Cu-Fe-S 系统。此外，这种一锅合成策略还能够微调混合相硫化物纳米复合材料。因此，它为研究硫化物的相可调特性、性能和应用提供了一个平台。