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, Mobile and Social Computing Lab (MobS), Fondazione Bruno Kessler (FBK), Trento, Italy., 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://ucrisportal.univie.ac.at/en/publications/tunable-band-gap-in-hydrogenated-quasifreestanding-graphene(4af28394-0761-4953-b5d5-62163ae539e8).html