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Exciting H2 Molecul...
Exciting H2 Molecules for Graphene Functionalization
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- Kyhl, Line (author)
- Aarhus University
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- Bisson, Régis (author)
- Aix-Marseille University
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- Balog, Richard (author)
- Aarhus University
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- Groves, Michael N. (author)
- Aarhus University
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- Kolsbjerg, Esber Leonhard (author)
- Aarhus University
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- Cassidy, Andrew Martin (author)
- Aarhus University
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- Jœrgensen, Jacob Holm (author)
- Aarhus University
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- Halkjær, Susanne (author)
- Aarhus University
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- Miwa, Jill A. (author)
- Aarhus University
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- Čabo, Antonija Grubišić (author)
- Aarhus University
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- Angot, Thierry (author)
- Aix-Marseille University
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- Hofmann, Philip (author)
- Aarhus University
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- Arman, Alif (author)
- Lund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory
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- Urpelainen, Samuli (author)
- Lund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory
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- Lacovig, Paolo (author)
- Elettra Sincrotrone Trieste
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- Bignardi, Luca (author)
- Elettra Sincrotrone Trieste
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- Bluhm, Hendrik (author)
- Lawrence Berkeley National Laboratory
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- Knudsen, Jan (author)
- Lund University,Lunds universitet,MAX IV-laboratoriet,Synkrotronljusfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,MAX IV Laboratory,Synchrotron Radiation Research,Department of Physics,Departments at LTH,Faculty of Engineering, LTH
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- Hammer, Bjœrk (author)
- Aarhus University
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- Hornekaer, Liv (author)
- Aarhus University
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(creator_code:org_t)
- 2017-12-18
- 2017
- English.
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In: ACS Nano. - : American Chemical Society (ACS). - 1936-086X .- 1936-0851.
- Related links:
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http://dx.doi.org/10...
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https://doi.org/10.1...
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Abstract
Subject headings
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- Hydrogen functionalization of graphene by exposure to vibrationally excited H2 molecules is investigated by combined scanning tunneling microscopy, high-resolution electron energy loss spectroscopy, X-ray photoelectron spectroscopy measurements, and density functional theory calculations. The measurements reveal that vibrationally excited H2 molecules dissociatively adsorb on graphene on Ir(111) resulting in nanopatterned hydrogen functionalization structures. Calculations demonstrate that the presence of the Ir surface below the graphene lowers the H2 dissociative adsorption barrier and allows for the adsorption reaction at energies well below the dissociation threshold of the H–H bond. The first reacting H2 molecule must contain considerable vibrational energy to overcome the dissociative adsorption barrier. However, this initial adsorption further activates the surface resulting in reduced barriers for dissociative adsorption of subsequent H2 molecules. This enables functionalization by H2 molecules with lower vibrational energy, yielding an avalanche effect for the hydrogenation reaction. These results provide an example of a catalytically active graphene-coated surface and additionally set the stage for a re-interpretation of previous experimental work involving elevated H2 background gas pressures in the presence of hot filaments.
Subject headings
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Keyword
- graphene, vibrational excitation, nanostructured functionalization, band gap engineering, molecular hydrogen, catalysis
Publication and Content Type
- art (subject category)
- ref (subject category)
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ACS Nano
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- By the author/editor
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Kyhl, Line
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Bisson, Régis
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Balog, Richard
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Groves, Michael ...
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Kolsbjerg, Esber ...
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Cassidy, Andrew ...
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show more...
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Jœrgensen, Jacob ...
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Halkjær, Susanne
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Miwa, Jill A.
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Čabo, Antonija G ...
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Angot, Thierry
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Hofmann, Philip
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Arman, Alif
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Urpelainen, Samu ...
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Lacovig, Paolo
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Bignardi, Luca
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Bluhm, Hendrik
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Knudsen, Jan
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Hammer, Bjœrk
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Hornekaer, Liv
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Atom and Molecul ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Condensed Matter ...
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ACS Nano
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Lund University