感應加熱法合成大面積石墨膜及特性分析

Synthesis and Characterization of Large Area Graphite Films by Induction Heating Method

黃政諺(Chen-Yen Huang)

指導教授 ： 王錫九

國立臺北科技大學/工程學院/材料科學與工程研究所/碩士(2011年)

https://doi.org/10.6841/NTUT.2011.00530

摘要

石墨烯為近幾年備受矚目的新型薄膜材料。石墨烯和石墨的相差之處在於石墨烯為單層石墨的準二維材料。具備許多優異的特性，如高機械應力、高熱傳導係數、高指向的表面，以及快速的遷移率。可用於製備出單電子電晶體、透明電極、紫外線LED、氣體感測、超級電容以及生物晶片等，被認為在未來軟性透明導電薄膜及相關的光電元件產品上，具有相當大的應用空間。
本實驗中過渡金屬在高溫下會對石墨產生催化原理。將石墨與過渡金屬粉末混合後利用封管設備分別封入真空環境以及氬氣氣氛的石英管中，藉由感應加熱的方法使碳原子於較短時間內在試片表面形成銀色光澤且大面積的石墨膜。與傳統合成方式比較，使用感應加熱的方式可提升製成效率。
在不同氣氛環境下及藉由不同的冷卻方式，石墨膜表面會產生類似晶界的皺摺結構；利用統計的方式，隨著冷卻速率越慢皺摺的密度減少。藉由拉曼光譜的分析，我們發現於1580 cm-1波段位置形成形狀相當對稱的G peak；位於約2750 cm-1的波段具有石墨烯的特性峰2D peak。最後再將石墨膜分離後利用X射線繞射儀進行結構分析，發現到所生成的石墨膜為2H形的結構。

關鍵字

石墨烯 ； 準二維材料 ； 感應加熱 ； 皺摺 ； 拉曼光譜

並列摘要

Graphene is the attractive new film material for the past few years. The differences between graphene and graphite are that graphene is the quasi-2D materials with excellent properties such as high mechanical stress, high conductivity, high specific surface area, and high electron mobility. For flexible transparent conductive films and related optoelectronic products, graphene is with large potential on them.
The principle of the catalytic reaction of graphite decomposed into carbon atoms in the transition metals at high temperatures was applied in this study. Samples with proper ratio of graphite powder and trasition metal powder were mixed and pressed into a cylindrical pellet which was sealed into the quartz tube with vacuum and argon atmosphere. The samples were then heated by induction heating equipment with various power and time conditions. A carbon atom would be precipitated from the solid solution and formed a large area graphite film on the surface of the bulk samples during a short time. As compared with the traditional synthesis methods, the induction heating can enhance the efficiency of fabrication process of graphite films.
The physical properties of the graphite films were investigated by the optical microscopy, scanning electronic microscopy, Raman spectroscopy and Hall meter. Large area graphite films were observed in the bulk samples. The morphology of films with wrinkle defects which is at the edge of the graphite grain boundary could be formed during various process condictions. Using the statistical methods, the density of the wrinkle could be reduced with the cooling rate. By Raman spectrum, it discovered the graphite films formed by multi-layer graphene that the G peak, which is quite sharp, is at the position of 1580 cm-1, and the 2D peak, which is a characteristics of graphene, is at about 2750 cm-1. Finally we analyze the exfoliating graphite film by x-ray diffraction and it is showed a 2H-type crystal structure in these samples.

並列關鍵字

Grphene ； Quasi-2D material ； catalytic ； induction heating ； wrinkle ； Raman spectrum

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