陸亭樺藍彥文Lu, Ting-HuaLan, Yann-Wen張瑀真Chang, Yu-Chen2022-06-082024-08-232022-06-082021https://etds.lib.ntnu.edu.tw/thesis/detail/564571a232aeb97ba8c70af2217776a4/http://rportal.lib.ntnu.edu.tw/handle/20.500.12235/117679石墨烯為一種單層碳原子構成蜂巢狀二維平面的特殊材料，自2004年開始，單層的石墨烯成功地被塊狀的石墨剝離後，近幾年大家開始探索且研發其他更多不同導電特性的二維材料。石墨烯具有獨特的高導電、高導熱以及對光的高敏感性而備受重視。本研究利用化學溶劑濕式蝕刻法以及氣泡轉移法，以在不影響石墨烯品質的情況下轉移到矽基板，測量石墨烯二維材料的原子振動反應並探討與其基板的交互作用情形，利用偏振拉曼光譜儀系統量測原子振動的偏振狀態。本研究使用不同偏振態的入射光 （圓偏振光、線性偏振光）照射石墨烯樣品，讓石墨烯因在不同基板上的耦合效應不同而破壞了簡併振動帶，因而使得簡併聲子振動比例有所不同，也導致偏振拉曼振動狀態和振動強度的改變。我們更進一步利用石墨烯中簡併聲子振動帶的特性量測到二維材料具有旋光轉換的效應。本研究也將會介紹如何使用偏振程度（Degree of polarization）的算式結合拉曼光譜來了解不同基板上石墨烯原子振動狀態的偏振特性並能夠藉由數值模擬來驗證實驗結果。這些成果及實驗方法將有助於深入研究光與二維材料與基板交互作用，探討更多基本的材料物理特性及未來可能的應用。Graphene thin layer exhibits remarkable electronic, optical, and mechanical properties, for this reason, it has high scientific interest, and huge potential for a variety of applications. Furthermore, these properties are very sensitive and highly depend on the choice of the substrates. In this study, we perform the wet-etching chemical method and bubbling transfer method. The two methods can transfer monolayer graphene onto the silicon substrate without affecting the quality of graphene, then measure the vibration response of the graphene. Finally, we discuss the interaction between the material and substrates.Polarized micro-Raman spectroscopy, which can utilize linearly polarized light and circularly polarized light, is a versatile technique that can be used to study not only the vibrational modes of the materials and also the optical coupling between graphene atoms and the different substrates. The Raman G-band in graphene is the most important phonon mode to examine the optical properties, which C-C bond stretching can arise from not only the layer of graphene increasing and also the structure of the substrates. Interestingly, the Raman spectrum of the G band has characteristics for the helicity exchange. In this report, we have studied the optical helicity exchange between graphene and different substrates by calculating the degree of polarization (DoP) via Raman spectra. This study can help to build the understanding for controlling the phonon mode in graphene (the G band) by choosing the different substrates. The obtained experimental results have been verified by numerically simulated helicity analysis. These results provide an important experimental method for studying the light-matter interaction between two-dimensional materials and substrates.石墨烯偏振拉曼光譜旋光轉換效應聲子震動Graphenepolarized Raman spectroscopyhelicity exchangephonon學術論文