中文摘要：

本文以普通硫粉和钼酸钠为原料，通过两相法在170-200℃下经8h制备得到二硫化钼纳米片，同时基于聚集．聚并模型提出其三步法生长机理。其中，硫粉的再组装保证了其向H2S的转化，使钼酸钠得以还原，因此在本方法中起到关键作用。本法制备得到的硫化钼纳米片富含可能由于各种位错引起的未饱和硫原子，有利于其在催化加氢等领域的应用。此外，由于二维过渡金属硫族化合物结构相似，所以本方法及其机理可能同样适用于其他二维过渡金属硫族化合物。本方法为绿色、便捷制备二硫化钼纳米片提供了一个选择。

英文摘要：

MoS2 nanosheets are prepared with sulfur powder and Na2MoO4 by a one-pot two-phase method at 170-200 ℃ for 8 h. In addition, a three-step growth mechanism based on the aggregation and coalescence model is proposed. The reassembly of sulfur powder ensures the transformation from sulfur powder to H2S to reduce Na2MoO, and plays a key role in the successful preparation of MoS2 nanosheets. The as-prepared MoS2 nanosheets are rich in unsaturated sulfur atoms, probably resulting from the dislocation cores of the MoS2 nanosheets, which have been found to be beneficial for hydrogen evolution reaction catalysis. The method and growth mechanism adopted in this study may be applied to other transition metal dichalogenides for similar structures. The facile and green method provides an alternative for the preparation of MoS2 nanosheets.