title: Solution-Synthesized Chevron Graphene Nanoribbons Exfoliated onto H:Si(100).
abstract: There has been tremendous progress in designing and synthesizing graphene nanoribbons (GNRs). The ability to control the width, edge structure, and dopant level with atomic precision has created a large class of accessible electronic landscapes for use in logic applications. One of the major limitations preventing the realization of GNR devices is the difficulty of transferring GNRs onto nonmetallic substrates. In this work, we developed a new approach for clean deposition of solution-synthesized atomically precise chevron GNRs onto H:Si(100) under ultrahigh vacuum. A clean transfer allowed ultrahigh-vacuum scanning tunneling microscopy (STM) to provide high-resolution imaging and spectroscopy and reveal details of the electronic structure of chevron nanoribbons that have not been previously reported. We also demonstrate STM nanomanipulation of GNRs, characterization of multilayer GNR cross-junctions, and STM nanolithography for local depassivation of H:Si(100), which allowed us to probe GNR-Si interactions and revealed a semiconducting-to-metallic transition. The results of STM measurements were shown to be in good agreement with first-principles computational modeling.
authors.affiliation: Beckman Institute for Advanced Science and Technology, ‡Department of Materials Science and Engineering, §Department of Mechanical Science and Engineering, and ∥Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign , Urbana, Illinois 61801, United States.|Department of Chemistry and #Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln , Lincoln, Nebraska 68588, United States.
authors.forename: Adrian
authors.identifier: 0000-0002-4496-2573
authors.initials: A
authors.lastname: Radocea
authors.affiliation: Beckman Institute for Advanced Science and Technology, ‡Department of Materials Science and Engineering, §Department of Mechanical Science and Engineering, and ∥Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign , Urbana, Illinois 61801, United States.|Department of Chemistry and #Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln , Lincoln, Nebraska 68588, United States.
authors.forename: Tao
authors.initials: T
authors.lastname: Sun
authors.affiliation: Beckman Institute for Advanced Science and Technology, ‡Department of Materials Science and Engineering, §Department of Mechanical Science and Engineering, and ∥Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign , Urbana, Illinois 61801, United States.|Department of Chemistry and #Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln , Lincoln, Nebraska 68588, United States.
authors.forename: Timothy H
authors.initials: TH
authors.lastname: Vo
authors.affiliation: Beckman Institute for Advanced Science and Technology, ‡Department of Materials Science and Engineering, §Department of Mechanical Science and Engineering, and ∥Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign , Urbana, Illinois 61801, United States.|Department of Chemistry and #Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln , Lincoln, Nebraska 68588, United States.
authors.forename: Alexander
authors.identifier: 0000-0002-8688-3451
authors.initials: A
authors.lastname: Sinitskii
authors.affiliation: Beckman Institute for Advanced Science and Technology, ‡Department of Materials Science and Engineering, §Department of Mechanical Science and Engineering, and ∥Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign , Urbana, Illinois 61801, United States.|Department of Chemistry and #Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln , Lincoln, Nebraska 68588, United States.
authors.forename: Narayana R
authors.initials: NR
authors.lastname: Aluru
authors.affiliation: Beckman Institute for Advanced Science and Technology, ‡Department of Materials Science and Engineering, §Department of Mechanical Science and Engineering, and ∥Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign , Urbana, Illinois 61801, United States.|Department of Chemistry and #Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln , Lincoln, Nebraska 68588, United States.
authors.forename: Joseph W
authors.identifier: 0000-0001-7285-4310
authors.initials: JW
authors.lastname: Lyding
keywords: armchair edges; current imaging tunneling spectroscopy; dry contact transfer; graphene nanoribbons; scanning tunneling spectroscopy; silicon