Tunable Band Gap in Hydrogenated Quasi-Free-standing Graphene
- Author(s)
- Danny Haberer, D.V. Vyalikh, Simone Taioli, Balazs Dora, Mani Farjam, J. Fink, Dmitry Marchenko, Thomas Pichler, Klaus Ziegler, Stefano Simonucci, Mildred S. Dresselhaus, Martin Knupfer, Bernd Büchner, Alexander Grüneis
- Abstract
We show by angle-resolved photoemission spectroscopy that a tunable gap in quasi-free-standing monolayer graphene on Au can be induced by hydrogenation. The size of the gap can be controlled via hydrogen loading and reaches similar to 1.0 eV for a hydrogen coverage of 8%. The local rehybridization from sp(2) to sp(3) in the chemical bonding is observed by X-ray photoelectron spectroscopy and X-ray absorption and allows for a determination of the amount of chemisorbed hydrogen. The hydrogen induced gap formation is completely reversible by annealing without damaging the graphene. Calculations of the hydrogen loading dependent core level binding energies and the spectral function of graphene are in excellent agreement with photoemission experiments. Hydrogenation of graphene gives access to tunable electronic and optical properties and thereby provides a model system to study hydrogen storage in carbon materials.
- Organisation(s)
- Electronic Properties of Materials
- External organisation(s)
- Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden, Technische Universität Dresden, Fondazione Bruno Kessler, Budapest University of Technology and Economics, Institute for Research in Fundamental Sciences (IPM), Helmholtz-Zentrum Berlin für Materialien und Energie, Universität Augsburg, Università degli Studi di Camerino, Massachusetts Institute of Technology
- Journal
- Nano Letters: a journal dedicated to nanoscience and nanotechnology
- Volume
- 10
- Pages
- 3360-3366
- No. of pages
- 7
- ISSN
- 1530-6984
- DOI
- https://doi.org/10.1021/nl101066m
- Publication date
- 2010
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 1030 Physics, Astronomy
- Portal url
- https://ucris.univie.ac.at/portal/en/publications/tunable-band-gap-in-hydrogenated-quasifreestanding-graphene(4af28394-0761-4953-b5d5-62163ae539e8).html