| 研究生: |
張寶玉 Chang, Bao-Yu |
|---|---|
| 論文名稱: |
利用液相剝離法製備層狀二硫化鉬應用於室溫氣體感測 Layered MoS2 Prepared by Liquid Phase Exfoliation and Its Application to Room Temperature Gas Sensing |
| 指導教授: |
劉全璞
Liu, Chuan-Pu |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 材料科學及工程學系 Department of Materials Science and Engineering |
| 論文出版年: | 2016 |
| 畢業學年度: | 104 |
| 語文別: | 中文 |
| 論文頁數: | 106 |
| 中文關鍵詞: | 二維材料 、層狀結構 、二硫化鉬 、室溫氣體感測 |
| 外文關鍵詞: | Two-dimensional materials, Layered-structure, Molybdenum disulfide, Room temperature gas sensing |
| 相關次數: | 點閱:195 下載:7 |
| 分享至: |
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本研究利用液相剝離法製備大量且大面積的二硫化鉬奈米片,溶劑選擇低成本且低沸點的45vol%乙醇溶液,接著在真空退火爐管通入氧氣達到表面氧化作為改質,分別製作成奈米元件進行室溫氣體感測性質分析。在分析上分別以微拉曼光譜(Micro-Raman)和紫外/可見光/近紅光吸收光譜(UV-vis)分析45vol%的乙醇溶液剝離效果;利用掃描式電子顯微鏡(Scanning Electron Microscopy, SEM)、穿透式電子顯微鏡(Transmission Electron Microscopy, TEM)及X光繞射觀察二硫化鉬奈米片之表面形貌與微結構;藉由即時記錄氣體感測過程的電流變化,探討在氣體吸附在奈米片上的機制,改質後的二硫化鉬偵測氨氣氣體感測之靈敏度上升;卻對乙醇氣體的靈敏度降低。證實利用簡易的表面改質方式可以提升二硫化鉬氣體感測的表現,並能在低濃度(0.7ppm)的氨氣具有相當好的氣體靈敏度,證實本研究在室溫氣體感測是具有競爭力。
This study investigates room temperature gas sensing of MoS2 nanosheets synthesized by liquid phase exfoliation followed by annealing in oxygen atmosphere. Scanning electron microscopy images clearly showed that 45vol% ethanol could exfoliate bulk MoS2 into nanosheets. Raman spectrometry and ultraviolet-visible spectrometry also showed that 45vol% ethanol successfully exfoliated bulk MoS2 into few layers. The structure of MoS2 nanosheets was analyzed using Transmission electron microscopy. X-ray photoelectron spectroscopy clearly showed that Mo and S were partially oxidized. Using annealing in oxygen atmosphere, as surface modification, the performance of MoS2 gas sensing could be improved. Using oxidized MoS2 nanosheets, the sensitivity of 0.7ppm NH3 was enhanced from 8.1% to 8.6% at room temperature.
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