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研究生:朱哲門
研究生(外文):Che-Men, Chu
論文名稱(外文):Growth of the twisted bilayer graphene through the two-stage chemical vapor deposition
指導教授:溫偉源
指導教授(外文):Wei-Yen, Woon
學位類別:碩士
校院名稱:國立中央大學
系所名稱:物理學系
學門:自然科學學門
學類:物理學類
論文出版年:2020
畢業學年度:108
語文別:中文
論文頁數:92
中文關鍵詞:化學氣相層積石墨烯旋轉角拉曼光譜學
外文關鍵詞:CVDgraphenetwist angleRaman spectroscopy
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我們通過兩階段化學氣相沉積(CVD)研究扭曲的雙層石墨烯的生長。利用協同作用的成核和生長動力學,從銅塊和氣態CHx中殘留的碳雜質中吸收碳源,在銅基體上生長了亞毫米大小的單晶石墨烯晶粒,並在其下方形成了多個合併的吸附層晶粒。通過使用微拉曼映射的光譜特徵的計算機算法研究扭轉角的分佈。除了熱力學更穩定的AB堆疊(AB-雙層石墨烯)或大角度(> 15°)解耦雙層石墨烯(DC-BLG)配置之外,還有一些雙層區域包含特定的扭曲角(3〜8°,8〜13 °和11-15°)(稱為扭曲雙層石墨烯)。統計數據表明,具有單個成核中心的雙層石墨烯沒有扭曲雙層石墨烯形成。 扭曲雙層石墨烯的形成概率在很大程度上取決於合併的增加層晶粒的相對取向。在未創建扭曲雙層石墨烯域的情況下,在AB-DC合併事件中形成的晶界處發現了明顯的缺陷。 扭曲雙層石墨烯的面積分數隨H2 / CH4比的增加而增加。鑑於第二層晶粒之間的相互作用,並考慮了在添加層合併過程中產生的應變,討論了扭曲雙層石墨烯的生長機理。
The research is about the growth of twisted bilayer graphene through a two-stage chemical vapor deposition (CVD). The graphene grows on Cu toward sub-millimeter-sized single crystalline graphene grains with multiple merged adlayer grains formed underneath. Developing the synergetic nucleation and growth dynamics involve carbon sources from the residual carbon impurities in Cu bulk and gaseous CHx. The distribution of the twist angles is investigated through a computer algorithm utilizing spectral features from micro-Raman mapping. Apart from the thermodynamically stable AB-stacking (AB-BLG) or large angle (> 15°) decoupled bilayer graphene (DC-BLG) configurations, some inspection of bilayer regions contain specific twist angles (3~8°, 8~13°, and 11-15°) (termed as TBLG). The statistics show no TBLG formation for BLG with single nucleation center. The formation probability of TBLG clearly reflects the orientation mismatch of merging adlayer grains. Significant defects are found at the grain boundaries formed in AB-DC merging event without creating TBLG domain. The areal fraction of TBLG increases as H2/CH4 ratio increases. The growth mechanism of TBLG is discussed in light of the interactions between the second layer grains with consideration of strain generation during the merging of adlayers.
Content
Figure list
Chapter 1 Introduction 1
Chapter 2 Background 4
2.1 Graphene 4
2.2 Chemical vapor deposition of graphene 12
2.2.1 Chemical vapor deposition 12
2.2.1 Orientation in graphene 18
2.3 Raman spectroscopy 25
2.3.1 Characterization of graphene in Raman spectroscopy 31
2.3.2 Characterization in twisted graphene 35
Chapter 3 Experiment set-up and method 39
3.1 Sample preparation 39
3.1.1 CVD process of graphene growth 39
3.1.2 Graphene transfer 42
3.2 Micro Raman spectroscopy 44
3.3 Dispersion of twist angles 46
Chapter 4 Result and discussion 51
4.1 The growth of the second layer 51
4.2 Strain from the transfer 54
4.3 Multiple nucleation adlayer 58
4.4 Tuning twisted BLG 67
Chapter 5 Conclusion 69
Acknowledgement 70
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