Abstract

The properties and applications of molybdenum disulfide (MoS₂) are significantly dependent on its purity. Physical purification is proposed for separating impurities from MoS₂. Meanwhile, the feasibility of separation of impurities was analyzed by thermodynamic calculations. The effects of the temperature and heating duration on the volatilization of impurities were studied experimentally. The purity of MoS₂ was notably improved by vacuum distillation at optimized processing conditions. The phase of the volatiles and the microstructural change of the residues were investigated and characterized by X-ray diffraction analysis, scanning electron microscopy, electron probe microanalysis, Raman spectroscopy, and atomic force microscopy.

Graphical Abstract

1. 1.

   Vacuum distillation is a scalable one-step approach to separate impurities from molybdenum disulfide.

2. 2.

   The purity of the residual MoS₂ significantly depends on the distillation temperature and duration.

3. 3.

   Tiny amounts of impurities were collected and analyzed by phase determination.

4. 4.

   The transformation to multilayer stacks is attributed to the high temperature used during vacuum distillation.

中文翻译：

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真空蒸馏法纯化二硫化钼的实验研究

摘要

二硫化钼（MoS ₂）的性质和应用很大程度上取决于其纯度。提出了物理纯化以从MoS _2中分离杂质。同时，通过热力学计算分析了分离杂质的可行性。实验研究了温度和加热时间对杂质挥发的影响。通过在最佳加工条件下进行真空蒸馏，明显提高了MoS ₂的纯度。通过X射线衍射分析，扫描电子显微镜，电子探针显微分析，拉曼光谱和原子力显微镜研究了挥发物的相和残余物的微观结构变化。

图形概要

1. 1。

   真空蒸馏是一种可扩展的一步式方法，可将杂质与二硫化钼分离。

2. 2。

   残余MoS ₂的纯度在很大程度上取决于蒸馏温度和持续时间。

3. 3。

   收集少量杂质，并通过相测定进行分析。

4. 4。

   向多层堆叠的转变归因于真空蒸馏期间使用的高温。