Graphene coatings: probing the limits of the one atom thick protection layer
| Autor: | Bjørk Hammer, Flemming Besenbacher, Louis Nilsson, Philip Hofmann, Liv Hornekær, Richard Balog, Ivan Stensgaard, Erik Lægsgaard, Mie Andersen |
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| Rok vydání: | 2012 |
| Předmět: |
Materials science
Hydrogen Intercalation (chemistry) General Physics and Astronomy chemistry.chemical_element Nanotechnology 02 engineering and technology engineering.material 010402 general chemistry 01 natural sciences law.invention Metal Coating law Materials Testing General Materials Science Composite material Platinum Graphene General Engineering 021001 nanoscience & nanotechnology 0104 chemical sciences chemistry visual_art visual_art.visual_art_medium engineering Protection layer Nanoparticles Density functional theory Graphite Adsorption Scanning tunneling microscope 0210 nano-technology |
| Zdroj: | ACS Nano Nilsson, L, Andersen, M, Balog, R, Lægsgaard, E, Hofmann, P, Besenbacher, F, Hammer, B, Stensgaard, I & Hornekær, L 2012, ' Graphene Coatings: Probing the Limits of the One Atom Thick Protection Layer ', A C S Nano, vol. 6, no. 11, pp. 10258–10266 . https://doi.org/10.1021/nn3040588 |
| ISSN: | 1936-086X |
| DOI: | 10.1021/nn3040588 |
| Popis: | The limitations of graphene as an effective corrosion-inhibiting coating on metal surfaces, here exemplified by the hex-reconstructed Pt(100) surface, are probed by scanning tunneling microscopy measurements and density functional theory calculations. While exposure of small molecules directly onto the Pt(100) surface will lift the reconstruction, a single graphene layer is observed to act as an effective coating, protecting the reactive surface from O2 exposure and thus preserving the reconstruction underneath the graphene layer in O2 pressures as high as 104 mbar. A similar protective effect against CO is observed at CO pressures below 106 mbar. However, at higher pressures CO is observed to intercalate under the graphene coating layer, thus lifting the reconstruction. The limitations of the coating effect are further tested by exposure to hot atomic hydrogen. While the coating can withstand these extreme conditions for a limited amount of time, after substantial exposure, the Pt(100) reconstruction is lifted. Annealing experiments and density functional theory calculations demonstrate that the basal plane of the graphene stays intact and point to a graphene-mediated mechanism for the H-induced lifting of the reconstruction. |
| Databáze: | OpenAIRE |
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