Wenderoth, Martin

[["dc.bibliographiccitation.artnumber","2000473"],["dc.bibliographiccitation.issue","13"],["dc.bibliographiccitation.journal","Advanced Materials Interfaces"],["dc.bibliographiccitation.volume","7"],["dc.contributor.author","Wit, Bareld"],["dc.contributor.author","Bunjes, Ole"],["dc.contributor.author","Wenderoth, Martin"],["dc.contributor.author","Ropers, Claus"],["dc.date.accessioned","2020-05-29T09:51:18Z"],["dc.date.available","2020-05-29T09:51:18Z"],["dc.date.issued","2020"],["dc.description.abstract","Abstract The structure of a physisorbed sub‐monolayer of 1,2‐bis(4‐pyridyl)ethylene (bpe) on epitaxial graphene is investigated by low‐energy electron diffraction and scanning tunneling microscopy. Additionally, nonequilibrium heat‐transfer between bpe and the surface is studied by ultrafast low‐energy electron diffraction. Bpe arranges in an oblique unit cell which is not commensurate with the substrate. Six different rotational and/or mirror domains, in which the molecular unit cell is rotated by 28 ± 0.1° with respect to the graphene surface, are identified. The molecules are weakly physisorbed, as evidenced by the fact that they readily desorb at room temperature. At liquid nitrogen temperature, however, the layers are stable and time‐resolved experiments can be performed. The temperature changes of the molecules and the surface can be measured independently through the Debye–Waller factor of their individual diffraction features. Thus, the heat flow between bpe and the surface can be monitored on a picosecond timescale. The time‐resolved measurements, in combination with model simulations, show the existence of three relevant thermal barriers between the different layers. The thermal boundary resistance between the molecular layer and graphene is found to be 2 ± 1 × 10−8 K m2 W−1."],["dc.description.abstract","Physisorbed sub‐monolayers of 1,2‐bis(4‐pyridyl)ethylene on graphene are thoroughly characterized. Moreover, nonequilibrium heat dissipation from the molecular layer into the surface is investigated. The structure of the substrate enables simultaneous measurement of the temperature of the molecules and the surface. From this, the thermal boundary resistance between the molecules and graphene can be determined. image"],["dc.description.sponsorship","European Research Council http://dx.doi.org/10.13039/501100000781"],["dc.description.sponsorship","Deutsche Forschungsgemeinschaft http://dx.doi.org/10.13039/501100001659"],["dc.identifier.doi","10.1002/admi.202000473"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/66022"],["dc.language.iso","en"],["dc.notes.intern","DeepGreen Import"],["dc.relation","SFB 1073: Kontrolle von Energiewandlung auf atomaren Skalen"],["dc.relation","SFB 1073 | Topical Area C | C04 Untersuchung und Kontrolle photochemischer Reaktionen durch lokale optische Anregung im Rastertunnelmikroskop"],["dc.relation.issn","2196-7350"],["dc.relation.issn","2196-7350"],["dc.rights","This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited."],["dc.title","Structure and Nonequilibrium Heat‐Transfer of a Physisorbed Molecular Layer on Graphene"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","3"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Communications Chemistry"],["dc.bibliographiccitation.volume","5"],["dc.contributor.author","Bunjes, Ole"],["dc.contributor.author","Paul, Lucas A."],["dc.contributor.author","Dai, Xinyue"],["dc.contributor.author","Jiang, Hongyan"],["dc.contributor.author","Claus, Tobias"],["dc.contributor.author","Rittmeier, Alexandra"],["dc.contributor.author","Schwarzer, Dirk"],["dc.contributor.author","Ding, Feng"],["dc.contributor.author","Siewert, Inke"],["dc.contributor.author","Wenderoth, Martin"],["dc.date.accessioned","2022-02-01T10:31:12Z"],["dc.date.available","2022-02-01T10:31:12Z"],["dc.date.issued","2022"],["dc.description.abstract","Abstract Atomic scale studies of the anchoring of catalytically active complexes to surfaces may provide valuable insights for the design of new catalytically active hybrid systems. In this work, the self-assembly of 1D, 2D and 3D structures of the complex fac -Re(bpy)(CO) 3 Cl (bpy = 2,2′-bipyridine), a CO 2 reduction catalyst, on the Ag(001) surface are studied by a combination of low-temperature scanning tunneling microscopy and density functional theory calculations. Infrared and sum frequency generation spectroscopy confirm that the complex remains chemically intact under sublimation. Deposition of the complexes onto the silver surface at 300 K leads to strong local variations in the resulting surface coverage on the nanometer scale, indicating that in the initial phase of deposition a large fraction of the molecules is desorbing from the surface. Low coverage regions show a decoration of step edges aligned along the crystal’s symmetry axes <110>. These crystallographic directions are found to be of major importance to the binding of the complexes to the surface. Moreover, the interaction between the molecules and the substrate promotes the restructuring of surface steps along these directions. Well-aligned and decorated steps are found to act as nucleation point for monolayer growth (2D) before 3D growth starts."],["dc.description.sponsorship","Open-Access-Publikationsfonds 2021"],["dc.identifier.doi","10.1038/s42004-021-00617-9"],["dc.identifier.pii","617"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/98802"],["dc.language.iso","en"],["dc.notes.intern","DOI-Import GROB-517"],["dc.relation","SFB 1073: Kontrolle von Energiewandlung auf atomaren Skalen"],["dc.relation","SFB 1073 | Topical Area C: Photonen- und elektronengetriebene Reaktionen"],["dc.relation","SFB 1073 | Topical Area C | C01 Hydrid-Anordnungen für die Untersuchung photo-induzierter mehrstufiger katalytischer Prozesse"],["dc.relation","SFB 1073 | Topical Area C | C04 Untersuchung und Kontrolle photochemischer Reaktionen durch lokale optische Anregung im Rastertunnelmikroskop"],["dc.relation","SFB 1073 | Topical Area C | C07 Kontrolle Reaktivität hydridischer Photokatalysatoren"],["dc.relation.eissn","2399-3669"],["dc.rights","CC BY 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0"],["dc.title","Ordering a rhenium catalyst on Ag(001) through molecule-surface step interaction"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","033047"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","New Journal of Physics"],["dc.bibliographiccitation.volume","22"],["dc.contributor.author","Schröder, Benjamin"],["dc.contributor.author","Bunjes, Ole"],["dc.contributor.author","Wimmer, Lara"],["dc.contributor.author","Kaiser, Katharina"],["dc.contributor.author","Traeger, Georg A"],["dc.contributor.author","Kotzott, Thomas"],["dc.contributor.author","Ropers, Claus"],["dc.contributor.author","Wenderoth, Martin"],["dc.date.accessioned","2020-05-13T10:58:36Z"],["dc.date.available","2020-05-13T10:58:36Z"],["dc.date.issued","2020"],["dc.description.abstract","We investigate photocurrents driven by femtosecond laser excitation of a (sub)-nanometer tunnel junction in an ultrahigh vacuum low-temperature scanning tunneling microscope (STM). The optically driven charge transfer is revealed by tip retraction curves showing a current contribution for exceptionally large tip-sample distances, evidencing a strongly reduced effective barrier height for photoexcited electrons at higher energies. Our measurements demonstrate that the magnitude of the photo-induced electron transport can be controlled by the laser power as well as the applied bias voltage. In contrast, the decay constant of the photocurrent is only weakly affected by these parameters. Stable STM operation with photoelectrons is demonstrated by acquiring constant current topographies. An effective non-equilibrium electron distribution as a consequence of multiphoton absorption is deduced by the analysis of the photocurrent using a one-dimensional potential barrier model."],["dc.identifier.doi","10.1088/1367-2630/ab74ac"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/65298"],["dc.language.iso","en"],["dc.relation","SFB 1073: Kontrolle von Energiewandlung auf atomaren Skalen"],["dc.relation","SFB 1073 | Topical Area C | C04 Untersuchung und Kontrolle photochemischer Reaktionen durch lokale optische Anregung im Rastertunnelmikroskop"],["dc.relation.issn","1367-2630"],["dc.rights","CC BY 4.0"],["dc.title","Controlling photocurrent channels in scanning tunneling microscopy"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]