title: Monatomic chemical-vapor-deposited graphene membranes bridge a half-millimeter-scale gap.
abstract: One of the main concerns in nanotechnology is the utilization of nanomaterials in macroscopic applications without losing their extreme properties. In an effort to bridge the gap between the nano- and macroscales, we propose a clever fabrication method, the inverted floating method (IFM), for preparing freestanding chemical-vapor-deposited (CVD) graphene membranes. These freestanding membranes were then successfully suspended over a gap a half-millimeter in diameter. To understand the working principle of IFM, high-speed photography and white light interferometry were used to characterize and analyze the deformation behaviors of the freestanding graphene membranes in contact with a liquid during fabrication. Some nanoscale configurations in the macroscopic graphene membranes were able to be characterized by simple optical microscopy. The proposed IFM is a powerful approach to investigating the macroscopic structures of CVD graphene and enables the exploitation of freestanding CVD graphene for device applications.
authors.affiliation: Department of Nano-Mechanics, Korea Institute of Machinery & Materials (KIMM), 156 Gajungbuk-ro, Yuseong-gu, Daejeon 305-343, South Korea.
authors.forename: Choong-Kwang
authors.initials: CK
authors.lastname: Lee
authors.forename: Yun
authors.initials: Y
authors.lastname: Hwangbo
authors.forename: Sang-Min
authors.initials: SM
authors.lastname: Kim
authors.forename: Seoung-Ki
authors.initials: SK
authors.lastname: Lee
authors.forename: Seung-Mo
authors.initials: SM
authors.lastname: Lee
authors.forename: Seong-Su
authors.initials: SS
authors.lastname: Kim
authors.forename: Kwang-Seop
authors.initials: KS
authors.lastname: Kim
authors.forename: Hak-Joo
authors.initials: HJ
authors.lastname: Lee
authors.forename: Byung-Ik
authors.initials: BI
authors.lastname: Choi
authors.forename: Chang-Kyu
authors.initials: CK
authors.lastname: Song
authors.forename: Jong-Hyun
authors.initials: JH
authors.lastname: Ahn
authors.forename: Jae-Hyun
authors.initials: JH
authors.lastname: Kim