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  • 學位論文

低溫碳化生質物製備中性氧化石墨烯水溶液之研究

Preparation of neutral graphene oxide aqueous solution from low temperature carbonized biomass

指導教授 : 黃武章

摘要


石墨烯是一個單層碳原子,呈現正六邊形網狀結構原子厚度的二維材料,是目前世界上最薄且強韌的奈米材料。氧化石墨烯基本上形貌仍維持石墨烯的六角晶格結構,然而氧化石墨烯的基面跟邊界處,擁有大量的羥基、羧基等極性基團,是一種親水性物質,氧化石墨的層間距(0.7~1.2nm)較石墨的層間距(0.335 nm)大,層間距的擴大有利於氧化石墨被剝離成氧化石墨烯。 實驗結果得知以兩種生質物(SYC-A及SYC-B)進行氧化還原萃取法製備氧化石墨烯及是可行性的。經由結果我們得知該生質物藉由鍛燒精煉後會含有石墨微晶,藉著不同試驗探討整體實驗結果,分別為X光繞射分析儀了解石墨烯訊號及成分的分析確認製備之可行性;試驗中我們以掃描式電子顯微鏡看到了氧化石墨烯在溶液裡的外觀以及粉體其顆粒的表面變化,發現到從生質物石墨微晶中萃取成氧化石墨烯時,型態之差異,並用傅立葉紅外線光譜儀確認石墨烯粉體官能基訊號,本實驗氧化還原化學萃取法萃取生質物特性分析結果得知,(SYC-A及SYC-B)皆能成功製備出氧化石墨烯。 實驗室先前研究成果樣品pH值呈強酸性,會影響氧化石墨烯溶液的應用性,因此本試驗進行製程調整成功製備接近中性的氧化石墨烯溶液,以便廠商所需調配應用的氧化石墨烯溶液,並改善中性溶液下其不良分散性。

關鍵字

生質物 碳材 氧化石墨烯 石墨烯 石墨

並列摘要


Graphene is a two-dimensional material consisting of single-layered carbon atoms in hexagonal mesh atomic structure, which is currently the world’s thinnest and toughest nanomaterial. The basic formation of graphene oxide still remained the hexagonal lattice structure form of graphene. However, there are a mass amount of hydroxyl, carboxyl and other polar functional groups at the surface area and boundary region of graphene oxide, leading to the hydrophilic properties of graphene oxide. Layer spacing of graphene oxide (0.7~1.2nm) is larger than that of graphene (0.335nm), of which the larger layer spacing leads to better separation of graphite oxide into graphene oxide. Experiment result revealed that graphene oxide extraction method by redox reaction on two biomass substrate (SYC-A and SYC-B) is feasible. From this study, we observed the existence of graphite microcrystalline after refining process of the aforementioned biomass substrate. Various analysis method is adopted to examine the validity of the experiment outcomes. X-ray diffraction (XRD) analyzer was utilized to assess the signal of graphene and analyze the graphene composition in order to confirm the feasibility of the preparation method. Scanning electron microscope (SEM) wis conducted to study the appearance of graphene oxide in solution and the surface variation of the graphene oxide particulates in powder form, which observation shown that particle structural difference during the extraction of graphene oxide from graphite microcrystalline in biomass material. Fourier transform infrared spectrometer was also applied to verify the functional group signal of graphene powder. Characteristic analytic result of the biomass redox extraction method in this study proven that both SYC-A and SYC-B were successful in graphene oxide preparation. Previous laboratory prepared specimen was strongly acidic in pH value, in which would affect the applicability of graphene oxide solution. This study successfully prepared and manufactured near neutral pH value graphene oxide solution, in order to allow potential manufacturers to mix their desired graphene oxide solution and to improve poor dispersion properties in neutral solutions.

並列關鍵字

biomass carbon graphene oxide graphene graphite

參考文獻


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