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論文名稱：鐵鎳合金系統製備大面積石墨膜之研究 頁數：110頁
校所別：國立台北科技大學 材料科學與工程研究所
畢業時間：九十八學年度第二學期 學位：碩士
關鍵詞：石墨烯、高定向熱解石墨、鐵鎳合金、液相催化
石墨烯(graphene)，為一種二維的碳結構，是近年來深受到關注的薄膜
材料，在優越的化學穩定性、導電特性及機械性質下，未來將在能源材
料、光學顯示器等領域受到重視。
本研究利用高溫高壓合成鑽石中過渡金屬對於碳原催化之原理，選擇鐵
及鎳過渡金屬進行試驗，碳來源採用天然石墨粉末，利用真空燒結爐在
高溫且真空的狀態下，當合金到達液相狀態時，石墨因過渡金屬液相催
化的機制下自我修復重組，在合金的表面上成長出石墨層。透過改變合
金及石墨的比例、持溫的時間，在最要的參數下，可以成功的製備出連
續狀且大面積(公分)的石墨層。
為了了解石墨層的成長機制、性質及厚度，將針對分離前及分離後進行
觀察，利用光學式顯微鏡、掃描式電子顯微鏡、原子力顯微鏡、拉曼光
譜儀及愛克斯光繞射光譜儀進行量測與分析。在光學式顯微鏡的觀察，
可以從試片的部面得知石墨的生長及分佈，發現在不同的配比下，石墨
有明顯趨勢的變化，並探討成長機制，在最要的製程參數中，觀察到石
墨層的厚度在1~3μm間。轉移的過程，利用稀酸性水溶液腐蝕石墨及合
金界面，轉移至玻離基材上，以利於各量測及分析的進行。利用此製程
製備的石墨層厚度是目前所面臨的問題，若能有效的減少厚度且不破壞
形貌，對於未來石墨烯的應用將更有利於發展。
title:the study of large area graphite film prepartaion base on
fe-ni alloy system
school:national taipei university of technology pages:110
department:institute of materials science and engineering
time:june, 2009
keywords:graphene, hopg, fe-ni alloy, liquid-phase catalyis
graphene is a two-dimensional carbon structure. as a film material,
its has been drawing attentions over the past few yeas due to its
excellent chemical stability, electrical and mechanical properites,
which make graphene a promising energy and optical displays
materials.
this study is based on the mechanism of transition metal catalyzed
graphite to diamond transition under high pressure and temperature.
iron and nickel transition metal powders are adopted to react with
graphite powders in high temperature vacuum sintering furnace.
after melting, the graphtite flakes can be catalytically mended
toghther by the transition metal alloy. this process is self
assembling and self healing, so graphite layers can be formed on
the surface of the ingot. with optimal alloy/graphite ratios and
holding time, large area graphite film can be successfully prepared.
the formation mechanism, properties and thickness of the graphtie
film before and after separation are analyed by optical microscopy,
scanning election microscopy, atomic force microscopy, raman
spectroscopy and x-ray diffraction spectometer. the cross-sectional
metallographic observation of bulk specimen by an optical microscope
shows the distribution and variation of graphtie under various ratios,
which offers informations of graphite formation mechanism. with optimal
experiment parameters, the graphite layer thickness is oberved to
be 1~3 μm. separation process is carried out by etching the
interface between graphite layer and allalloy ingot with acid liquor.
the graphtie films are retrieved and mounted on a sio2 substrate
for subsequent analysis. the thickness of the graphite film prepared
in this process still needs improving. if it is effectiviely lowered
without influencing the morphology, there will be more potential
for the development of applications.
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