| Summary: | 碩士 === 國立臺北科技大學 === 材料科學與工程研究所 === 100 === This research used the liquid phase of Fe-Ni-Cu-Mn alloy to dissolve graphite powder; precipitate then synthesis to a large-area graphite layer on the surface of the alloy. We made use of a smelting vacuum furnace at 1350 ℃ for up to 5 hours to obtain the various samples in different alloy power ratios. And, we found some formulas which can produce a large-area graphene. According to our observation, A proper dendrite structure collocate a fine graphite wrinkle which will help the forming of partition phenomenon between graphite layers. In other words, the van der Waals bond might be vanished between graphite layers, so the graphite disassemble into the folded graphenes.
According to this research, copper plays an important role of controlling the segregation of carbon, and manganese enhances its ability. The partition phenomenon then take place dramatically in some alloy formulas. Finally, we separate its folded graphene film from the alloy surface by means of etching. The maximal area of graphene is about 2500μm2
We also observed the surface of the graphene to check the relation of appearance and graphene area by a simple location skill. Therefore, we can understand the principle to form the large area graphene layer by liquid phase metals, so as to be the foundation of application of high quality graphene layers.
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