title: Laser thinning for monolayer graphene formation: heat sink and interference effect.
abstract: 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.
authors.affiliation: BK21 Physics Division, Department of Energy Science, Center for Nanotubes and Nanostructured Composites, and Sungkyunkwan Advanced Institute of Nanotechnology, Sungkyunkwan University, Suwon 440-746, Korea.
authors.forename: Gang Hee
authors.initials: GH
authors.lastname: Han
authors.forename: Seung Jin
authors.initials: SJ
authors.lastname: Chae
authors.forename: Eun Sung
authors.initials: ES
authors.lastname: Kim
authors.forename: Fethullah
authors.initials: F
authors.lastname: Güneş
authors.forename: Il Ha
authors.initials: IH
authors.lastname: Lee
authors.forename: Sang Won
authors.initials: SW
authors.lastname: Lee
authors.forename: Si Young
authors.initials: SY
authors.lastname: Lee
authors.forename: Seong Chu
authors.initials: SC
authors.lastname: Lim
authors.forename: Hae Kyung
authors.initials: HK
authors.lastname: Jeong
authors.forename: Mun Seok
authors.initials: MS
authors.lastname: Jeong
authors.forename: Young Hee
authors.initials: YH
authors.lastname: Lee