本論文主要是對於二硫化鉬的穩定度做研究，單層的二硫化鉬如同石磨烯在半導體方面具有很好的發展潛力，也被看好能應用在很多領域上，因此二硫化鉬在環境中的穩定度是應用上重要的考慮因素。在本論文中使用離子插層法將塊材的二硫化鉬剝離，我們發現剝離後的二硫化鉬懸浮液並不穩定，放置數天後顏色會由黑色變為淡黃色。經由本實驗得知溶液的顏色變化為剝離後二硫化鉬懸浮液在鹼性環境中被氧化所造成。由XANES得知樣品變色前後Mo價態從4+變為6+，樣品氧化後的拉曼光譜在對照文獻後發現為Li2MoO4，EXAFS的擬合結果也顯示氧化後的樣品Mo鄰近配位原子由硫原子變為氧原子。由於造成二硫化鉬懸浮液氧化的因素為溶液中的鹼性物質，因此要提高二硫化鉬懸浮液的穩定度必須降低溶液中的氫氧根離子。透過透析模可將溶液中的氫氧根離子去除，避免二硫化鉬氧化的現象發生，即可提高剝離後二硫化鉬懸浮液的穩定性。

We studied the stability of molybdenum disulfide in alkaline solution. Single-layer MoS2 2D materials have great potential for practical applications in semiconductor devices, as well as many other technologies. The stability of molybdenum disulfide plays an important role for the materials’ performance in such applications. In this work, we used the lithium intercalation method to exfoliated bulk MoS2 into few-layer MoS2. The color of few-layer MoS2 dispersed in water solution was found to change dramatically from black to yellow after a few days. Our experimental results indicate that the color change of the solution is caused by the oxidation of MoS2. Molybdenum K-edge XANES spectra show that the Mo constituent element undergoes a valence change from 4+ to 6+ as the sample ages. Raman spectroscopy spectra reveal evidence that the few-layer MoS2 has been oxidized to form Li2MoO4. The local structural variations have also been investigated by the EXAFS method. We have found that the alkaline solution is responsible for the oxidation of few-layer MoS2 and we can obtain high stability for few-layer MoS2 in water solution after removing the lithium hydroxide by using dialysis membrane.

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