Laser Thinning for Monolayer Graphene Formation: Heat Sink and Interference Effect

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• 作者：Gang Hee Han ; Seung Jin Chae ; Eun Sung Kim ; Fethullah Güneş ; Il Ha Lee ; Sang Won Lee ; Si Young Lee ; Seong Chu Lim ; Hae Kyung Jeong ; Mun Seok Jeong ; Young Hee Lee
• 刊名：ACS Nano
• 出版年：2011
• 出版时间：January 25, 2011
• 年：2011
• 卷：5
• 期：1
• 页码：263-268
• 全文大小：398K
• 年卷期：0
• ISSN：1936-086X

文摘

Despite the availability of large-area graphene synthesized by chemical vapor deposition (CVD), the control of a uniform monolayer graphene remained challenging. Here, we report a method of acquiring monolayer graphene by laser irradiation. The accumulation of heat on graphene by absorbing light, followed by oxidative burning of upper graphene layers, which strongly relies on the wavelength of light and optical parameters of the substrate, was in situ measured by the G-band shift in Raman spectroscopy. The substrate plays a crucial role as a heat sink for the bottom monolayer graphene, resulting in no burning or etching. Oscillatory thinning behavior dependent on the substrate oxide thickness was evaluated by adopting a simple Fresnel’s equation. This paves the way for future research in utilizing monolayer graphene for high-speed electronic devices.