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.

摘要 I
Abstract II
致謝 III
章節目錄 IV
圖表目錄 VI
第一章 序論 1
1-1 研究動機 1
1-2 論文簡介 2
第二章 文獻回顧 3
2-1 二硫化鉬材料介紹 3
2-2 單層二硫化鉬(monolayer MoS2) 4
2-3 二硫化鉬的氧化研究 4
2-4 單層二硫化鉬的製備方法 5
第三章 實驗方法與原理 7
3-1紫外-可見光光譜(Ultraviolet-visible spectroscopy; UV-Vis spectroscopy) 7
3-2拉曼光譜(Raman spectroscopy) 8
3-3 X光吸收精密結構(X-ray absorption fine structure; XAFS) 10
第四章 樣品製備與實驗流程 16
4-1樣品製備 16
4-2實驗藥劑 17
4-3製備流程 18
4-4製備步驟 19
4-5樣品代號 20
第五章 數據分析與討論 21
5-1紫外-可見光光譜(Ultraviolet-visible spectroscopy) 21
5-2拉曼光譜分析(Raman spectroscopy) 25
5-3 X光吸收精密結構(X-ray absorption fine structure; XAFS) 31
5-3-1 X光吸收近邊緣結構(X-ray Absorption Near-Edge Structure; XANES) 31
5-3-2 延伸X光吸收精密結構(Extended X-ray Absorption Fine Structure; EXAFS) 33
第六章 結果與討論 39
參考文獻 40

第一章
1. J. Gao, B. Li, J. Tan, P. Chow, T.-M. Lu, and N. Koratkar, ACS Nano. 10, 2628 (2016).
第二章
1. I. Song, C. Parkab, and H.-C. Choi, RSC Adv. 5, 7495 (2015).
2. K.-F. Mak, C. Lee, J. Hone, J. Shan, and T.-F. Heinz. Phys. Rev. Lett. 105, 136805, (2010).
3. A. Splendiani, L. Sun, Y. Zhang, T. Li, J. Kim, C.-Y. Chim, G. Galli, and F. Wang, Nano Lett. 10, 1271 (2010).
4. X. Huang, Z. Zenga and H. Zhang, Chem. Soc. Rev. 42, 1934 (2013).
5. X. Wang and Y. Zhang, Phil. Mag. Lett. 96, 347, (2016).
6. J. Gao, B. Li, J. Tan, P. Chow, T.-M. Lu, and N. Koratkar, ACS Nano. 10, 2628, (2016).
7. J. Martincová, M. Otyepka, and P. Lazar, Chem. Eur. J. 23, 13233, (2017).
8. K. S. Novoselov, D. Jiang, F. Schedin, T. J. Booth, V. V. Khotkevich, S. V. Morozov, and A. K. Geim, PNAS. 102, 10451, (2005).
9. J.-N. Coleman1, M. Lotya, A. O’Neill, S.-D. Bergin, P.-J. King, U. Khan, K. Young, A. Gaucher, S. De, R.-J. Smith, I.-V. Shvets, S.-K. Arora, G. Stanton, H.-Y. Kim, K. Lee, G.-T. Kim, G.-S. Duesberg, T. Hallam, J.-J. Boland, J.-J. Wang, J.-F. Donegan, J.-C. Grunlan, G. Moriarty, A. Shmeliov, R.-J. Nicholls, J.-M. Perkins, E.-M. Grieveson, K. Theuwissen, D.-W. McComb, P.-D. Nellist, and V. Nicolosi, Science. 331, 568, (2011).
10. X. Fan, P. Xu, D. Zhou, Y. Sun, Y.-C. Li, M.-A.-T. Nguyen, M. Terrones, and T.- E. Mallouk, Nano Lett. 15, 5956, (2015).
11. X. Wang, H. Feng, Y. Wu, and L. Jiao, J. Am. Chem. Soc. 135, 5304, (2013).
第三章
1. Z. Chen, H.-N. Dinh, and E. Miller, Photoelectrochemical Water Splitting (2013), New York: Springer.
2. E. Smith, and G. Dent, Modern Raman Spectroscopy–A Practical Approach, (2005), England: John Wiley & Sons Ltd.
3. G.-S. Bumbrah, and R.-M. Sharma, Egypt. J. Forensic Sci. 6, 209, (2016).
第五章
1. C. Lee, H. Yan, L.-E. Brus, T.-F. Heinz, J. Hone and S. Ryu, ACS Nano. 4, 2695, (2010).
2. H. Li, Q. Zhang, C.-C.-R. Yap, B.-K. Tay, T.-H.-T. Edwin, A. Olivier, and D. Baillargeat, Adv. Funct. Mater. 22, 1385, (2012).
3. G.-D. Saraiva, W. Paraguassu, P.-T.-C. Freire, A.-J. Ramiro de Castro, F.-F. de Sousa, and J.-M. Filho, J. Mol. Struct. 1139, 119, (2017).
4. X. Liu, Y. Zhao, Y. Dong, Q. Fan, Q. Kuang, Z. Liang, X. Lin, W. Han, Q. Li, and M. Wen, Elec. trochim. Acta. 174, 315, (2015).
5. O. Barinova, S. Kirsanova, A. Sadovskiy, and I. Avetissov, J. Cryst. Growth. 401, 853, (2014).
6. F. Farges, R. Siewert, G.-E. Brown, Jr., A. Guesdon, and G. Morin, Can. Mineral. 44, 731, (2006).