title: Fabrication and In Situ Transmission Electron Microscope Characterization of Free-Standing Graphene Nanoribbon Devices.
abstract: Edge-dependent electronic properties of graphene nanoribbons (GNRs) have attracted intense interests. To fully understand the electronic properties of GNRs, the combination of precise structural characterization and electronic property measurement is essential. For this purpose, two experimental techniques using free-standing GNR devices have been developed, which leads to the simultaneous characterization of electronic properties and structures of GNRs. Free-standing graphene has been sculpted by a focused electron beam in transmission electron microscope (TEM) and then purified and narrowed by Joule heating down to several nanometer width. Structure-dependent electronic properties are observed in TEM, and significant increase in sheet resistance and semiconducting behavior become more salient as the width of GNR decreases. The narrowest GNR width we obtained with the present method is about 1.6 nm with a large transport gap of 400 meV.
authors.affiliation: Department of Chemistry, Nagoya University , Nagoya 464-8602, Japan.
authors.forename: Qing
authors.initials: Q
authors.lastname: Wang
authors.affiliation: Department of Chemistry, Nagoya University , Nagoya 464-8602, Japan.
authors.forename: Ryo
authors.initials: R
authors.lastname: Kitaura
authors.affiliation: Department of Chemistry, Nagoya University , Nagoya 464-8602, Japan.
authors.forename: Shoji
authors.initials: S
authors.lastname: Suzuki
authors.affiliation: Institute of Advanced Energy, Kyoto University , Uji, Kyoto 611-0011, Japan.
authors.forename: Yuhei
authors.initials: Y
authors.lastname: Miyauchi
authors.affiliation: Institute of Advanced Energy, Kyoto University , Uji, Kyoto 611-0011, Japan.
authors.forename: Kazunari
authors.initials: K
authors.lastname: Matsuda
authors.affiliation: High Voltage Electron Microscope Laboratory, Ecotopia Science Institute, Nagoya University , Nagoya 464-8602, Japan.
authors.forename: Yuta
authors.initials: Y
authors.lastname: Yamamoto
authors.affiliation: High Voltage Electron Microscope Laboratory, Ecotopia Science Institute, Nagoya University , Nagoya 464-8602, Japan.
authors.forename: Shigeo
authors.initials: S
authors.lastname: Arai
authors.affiliation: Department of Chemistry, Nagoya University , Nagoya 464-8602, Japan.
authors.forename: Hisanori
authors.initials: H
authors.lastname: Shinohara
keywords: band gap; free-standing structure; graphene nanoribbon; in situ TEM characterization; transport measurement