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February 2019: Publication in Science!

STM movies of the diffusion of single O atoms in a full layer of CO molecules on a Ru(0001) surface show how particles can move on a catalyst surface, even when the surface is highly covered by adsorbates. Surprisingly, the O atoms move through the CO layer almost as fast as on the completely empty metal surface. The mechanism may be called “door-opening” mechanism.

For more details access the full article here:
"Density fluctuations as door-opener for diffusion on crowded surfaces”, A.-K. Henß, S. Sakong, P.K. Messer, J. Wiechers, R. Schuster, D.C. Lamb, A. Groß, and J. Wintterlin, Science 363, 715 (2019).

or visit the Science website for abstract or full text.

Jan. 2017: one of the most downloaded articles in "Surface Science"

The article shows that a nickel layer used as support for graphene can be removed from underneath the graphene layer by reaction with CO. The photograph shows the reaction tube with the sample (blue) after the nickel has been removed; the transported Ni appears as dark precipitate on the tight hand side of the tube.
Reprinted from "Detachment of CVD-grown graphene from single-crystalline Ni films by a pure gas phase reaction", P. Zeller, A.-K. Henß, M. Weinl, L. Diehl, D. Keefere, J. Lippmann, A. Schulz, J. Kraus, M. Schreck, J. Wintterlin, Surf. Sci. 653, 143 (2016). Copyright 2016, with permission from Elsevier.

Dissociation of CO on a cobalt surface resolved by STM

STM image demonstrating that CO molecules can dissociate on a Co(0001) surface, an essential step in the Fischer-Tropsch reaction. The hexagonal pattern is formed by the intact CO molecules; the triangles are structures caused by C atoms resulting from the dissociation of CO molecules (see model with black carbon atoms). The image was recorded with a special " high-pressure" STM under 0.22 mbar CO at 493 K. 600 Å x 600 Å.
Adapted with permission from "In situ scanning tunneling microscopy of the dissociation of CO on Co(0001)", B. Böller, M. Ehrensperger, J. Wintterlin, ACS Catal. 5, 6802 (2015). Copyright 2015, American Chemical Society

Römer prize 2015 for Bernhard Böller

On Dec. 11, 2015, Bernhard Böller was awarded the Römer prize by the Dr. Klaus Römer-Stiftung for his master thesis "Dissoziation von Kohlenmon­oxid auf der Cobalt(0001)-Oberfläche - eine in situ-Studie mit dem Rastertunnelmikroskop".

"Preis für gute Lehre" 2015 for Joost Wintterlin

Awarded on Dec. 11, 2015, by the Fachschaft der Fakultät Chemie und Pharmazie.

Epitaxial graphene with defects can be healed by annealing

Movie recorded with a photoemission electron microscope (PEEM). It shows that a defect-rich graphene layer grown on a nickel surface can be healed, in contrast to expectations. In the beginning, the graphene layer exhibits areas with different contrast levels due to domains with different orientations or to bilayer graphene. During annealing at 700 °C the dark, "wrongly" oriented and bilayer graphene domains dissolved and were replaced by the bright, "correctly" oriented monolayer graphene. From a collaboration with the groups of M. Schreck (Univ. Augsburg) and T. Seyller (TU Chemnitz).
Reprinted with permission from "Healing of graphene on single crystalline Ni(111) films", P. Zeller, F. Speck, M. Weinl, M. Ostler, M. Schreck, T. Seyller, J. Wintterlin, Appl. Phys. Lett. 105, 191612 (2014). Copyright 2014, AIP Publishing LLC.

Römer prize 2014 for Ann-Kathrin Henß

On Dec. 5, 2014, Ann-Kathrin Henß was awarded the Römer prize by the Dr. Klaus Römer-Stiftung for her master thesis "Untersuchungen zur Synthese von freistehendem Graphen ausgehend von dünnen Ni(111)-Filmen".

STM images an operating Fischer-Tropsch model catalyst

Image taken with a special high-pressure STM, showing an operating Fischer-Tropsch model catalyst with atomic resolution. It was recorded on a Co(0001) surface in 10 mbar "syngas" (a mixture of CO and H2) at 493 K, during formation of methane, the first product in the series of hydrocarbon molecules formed by the Fischer-Tropsch synthesis. Except for atomic steps and some lattice deformations the surface was flat, in contrast to previous ideas about the state of the active surface. 2300 Å x 2300 Å.
Reprinted from "In situ high-pressure high-temperature scanning tunneling microscopy of a Co(0001) Fischer-Tropsch model catalyst", M. Ehrensperger, J. Wintterlin, J. Catal. 319, 274 (2014). Copyright 2014, with permission from Elsevier.

Leaving the islands

Movie recorded with a low-energy electron microscope (LEEM) (field of view 4.8 µm; the colored image to the right is the last frame of the movie). The data show an oxygen-covered silver surface, with oxygen atoms condensed in islands (dark); the bare silver surface appears bright. The movie was taken at 487 K, a temperature at which oxygen desorbs from the surface. The oxygen atoms only desorbed from the perimeters of the oxygen islands rather than from statistical positions, presumably a quite general effect. From a collaboration with the groups of S. Günther (TUM) and A. Locatelli (ELETTRA).
From "Desorption kinetics from a surface derived from direct imaging of the adsorbate layer", S. Günther, T. O. Mentes, M. A. Mino, A. Locatelli, S. Böcklein, J. Wintterlin, Nature Comm. 5, 3853 (2014).

Römer prize 2013 for Sebastian Böcklein

On Dec. 13, 2013 Sebastian Böcklein was awarded the Römer prize by the Dr. Klaus Römer-Stiftung for his PhD thesis "Untersuchungen zur katalytischen Ethylenepoxidierung über Silber - Überbrückung des pressure gap-Problems".

Römer prize 2012 for Regina Wyrwich

Awarded on Nov. 30, 2012, by the Dr. Klaus Römer-Stiftung, for her master thesis "Untersuchungen zur Ethylen-Epoxidierung".

Growing graphene can reshape a metal surface

Series of STM images, taken during epitaxial growth of graphene on a ruthenium surface at 665 °C. A special high-temperature STM has been used. The growing graphene layer reshapes the terrace structure of the metal. 7700 Å x 7700 Å.
From "Single terrace growth of graphene on a metal surface", S. Günther, S. Dänhardt, B. Wang, M.-L. Bocquet, S. Schmitt, J. Wintterlin, Nano Lett. 11, 1895 (2011).

Römer prize 2011 for Martin Ehrensperger

Awarded on Dec. 9, 2011, by the Dr. Klaus Römer-Stiftung, for his master thesis "Versuche zur Strukturlösung einer Silber-Sauerstoff-Oberflächenspezies mit der Methode der LEED-I/V-Analyse".

Graphene on metal surfaces can be strongly buckled

Structure model of a graphene monolayer on a ruthenium surface. One would expect that graphene only binds weakly, by van der Waals interactions, to a metal surface. However, the structure model for graphene on Ru(0001) obtained by a LEED-I(V) analysis, showed a strong buckling of the graphene layer (~1.5 Å), indicating a considerable variation of the bonding strength along the surface. This is the structure with the largest unit cell that has so far been solved by a LEED-I(V) analysis.
Reprinted with permission from " Structure determination of the coincidence phase of graphene on Ru(0001)", W. Moritz, B. Wang, M.-L. Bocquet, T. Brugger, T. Greber, J. Wintterlin, S. Günther, Phys. Rev. Lett. 104, 136102 (2010). Copyright 2010, American Physical Society.

Römer prize 2010 for Patrick Zeller

Awarded on Dec. 3, 2010, by the Dr. Klaus Römer-Stiftung, for his master thesis "Untersuchungen an Graphen auf Ir(111)-Metallfilmen".

Most downloaded article in the journal "Surface Science"

"Graphene on metal surfaces", J. Wintterlin and M.-L. Bocquet, Surf. Sci. 603, 1841 (2009). A review article on epitaxial graphene on metal surfaces that, by Jan. 2017, has been cited 527 times.

"Preis für gute Lehre" 2009 for Joost Wintterlin by the Bavarian Ministery of Science, Research, and Arts

Römer prize 2009 for Sebastian Böcklein

Awarded to Sebastian Böcklein (second from left) on Dec. 11, 2009, by the Dr. Klaus Römer-Stiftung, for his diploma thesis "Untersuchungen zum Hochdruckverhalten des Ag(111)/O-Systems".

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