In-situ observation of CVD growth of graphene on Au by radiation-mode optical microscopy

Terasawa, Tomoo   ; Taira, Takanobu*; Obata, Seiji*; Yasuda, Satoshi   ; Saiki, Koichiro*; Asaoka, Hidehito  

Monolayer selective growth of graphene was achieved by chemical vapor deposition on a Cu substrate due to its low carbon solubility. In this study, we attempted the in-situ observation of chemical vapor deposition of graphene on a Au substrate with low carbon solid solubility like Cu by a radiation-mode optical microscopy. In the radiation images, the bright contrast started the growth between the trenches of the Au foil and progressed parallel to the trenches. The result of Raman mapping measurement indiceted that this contrast corresponded to graphene. In the presentation, we will also discuss the growth mechanism of graphene on the Au substrate.