以固態碳源——聚乙烯成長石墨烯薄膜之研究

Growth of Graphene Films using Polyethylene as A Solid-State Carbon Source

許多研究致力於發展製備大面積單層至數層之石墨烯之方法，近來藉由甲烷／乙炔氣體以化學氣相沉積法已成功開發在銅或鎳金屬基材上成長石墨烯。但是甲烷／乙炔為高危險、易燃之爆炸性氣體，在本文中我們以固態碳源－－聚乙烯－－在銅箔上於高溫環境中裂解做為生長石墨烯之碳供應來源，並藉由調整氫氣／氬氣的比例，來控制並改善石墨烯的生長層數與良好結晶性。這個以高分子前驅物為碳源的熱裂解合成法提供了一個簡單、低成本、安全之石墨烯薄膜成長方法。

Much research has been focused on developing routes for obtaininglarge sheets of monolayer to few-layer graphene. This has been recentlyachieved by chemical vapor deposition (CVD) with CH4/C2H2 gases oncopper or nickel substrates. But methane and acetylene are extremelyflammable and may form explosive mixtures with air. Here we report thegrowth of continuous graphene films on copper foils with a solid-phase carbon source - polyethylene (PE) - as the precursor which were pyrolyzedat a high temperature and supplied the carbon for graphene growth. Byadjusting the H2/Ar flow rate ratio, the number of layers and crystallinity ofgraphene may be controlled. This polymer precursor-based pyrolysissynthesis provides a new route for the simple, economical, and safe growthof graphene thin-films.