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Publications

2016

"The reaction mechanism for the SCR process on monomer V5+ sites and the effect of modified Brønsted acidity"

Logi Arnarson, Hanne Falsig, Søren B. Rasmussen, Jeppe V. Lauritsen and Poul Georg Moses. Physical Chemistry Chemical Physics. DOI: 10.1039/C6CP02274J

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"Location of Co and Ni promoter atoms in multi-layer MoS2nanocrystals for hydrotreating catalysis"

Yuanyuan Zhu, Quentin M. Ramasse, Michael Brorson, Poul G. Moses, Lars P. Hansen, Henrik Topsøe, Christian F. Kisielowski, Stig Helveg. Catal. Today261 (2016) 75-81. DOI:10.1016/j.cattod.2015.08.053

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2015

        

"Growth and electronic structure of epitaxial single-layer WS2 on Au(111)"

Maciej Dendzik, Matteo Michiardi, Charlotte Sanders, Marco Bianchi, Jill A. Miwa, Signe S. Grønborg, Jeppe V. Lauritsen, Albert Bruix, Bjørk Hammer, and Philip Hofmann. Phys. Rev. B 2015, 92, 245442. DOI:http://dx.doi.org/10.1103/PhysRevB.92.245442 

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"Van der Waals Epitaxy of Two-Dimensional MoS2–Graphene Heterostructures in Ultrahigh Vacuum"

Jill A. Miwa, Maciej Dendzik, Signe S. Grønborg, Marco Bianchi, Jeppe V. Lauritsen, Philip Hofmann, and Søren Ulstrup. ACS Nano 2015, 9, 6502-6510. DOI: 10.1021/acsnano.5b02345

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"Synthesis of Epitaxial Single-Layer MoS2 on Au(111)"

Signe S. Grønborg, Søren Ulstrup, Marco Bianchi, Maciej Dendzik, Charlotte E. Sanders, Jeppe V. Lauritsen, Philip Hofmann*, and Jill A. Miwa. Langmuir 2015, 31, 9700-9706. DOI: 10.1021/acs.langmuir.5b02533

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"Coexistence of Square Pyramidal Structures of Oxo Vanadium (+5) and (+4) Species Over Low-Coverage VOX/TiO2 (101) and (001) Anatase Catalysts "

Logi Arnarson, Søren B. Rasmussen, Hanne Falsig, Jeppe V. Lauritsen, and Poul Georg Moses. J. Phys. Chem. C.DOI: 10.1021/acs.jpcc.5b06132

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"In Situ Detection of Active Edge Sites in Single-Layer MoS2 Catalysts"

Albert Bruix, Henrik Gøbel Füchtbauer, Anders K. Tuxen , Alexander S. Walton, Mie Andersen, Søren Porsgaard, Flemming Besenbacher, Bjørk Hammer and Jeppe V. Lauritsen. ACS Nano. DOI10.1021/acsnano.5b03199

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"Atom-resolved scanning tunneling microscopy investigations of molecular adsorption on MoS2 and CoMoS hydrodesulfurization catalysts"

 J. V. Lauritsen and F. Besenbacher. Journal of Catalysis, 328, 49-58, 2015. DOI:10.1016/j.jcat.2014.12.034

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prl

"Electronic Structure of Epitaxial Single-Layer MoS2"

 Direct observation of the electronic structure of single layer-MoS2: The electronic structure of epitaxial single-layer MoS2 on Au(111) is investigated by angle-resolved photoemission spectroscopy. The spin-orbit induced splitting of the otherwise degenerated upper valence band at  is observed as well as the conduction band minima for potassium-doped MoS2.

Jill A. Miwa, Søren Ulstrup, Signe G. Sørensen, Maciej Dendzik, Antonija Grubišić Čabo, Marco Bianchi, Jeppe Vang Lauritsen, and Philip Hofmann. PRL 114, 046802 (2015). DOI: 10.1103/PhysRevLett.114.046802

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2014

paper1_web_figure

"Visualizing the stoichiometry of industrial-style Co-Mo-S catalysts with single-atom sensitivity"

Promoting a cleaner environment: An industrial-style Co-Mo-S catalyst were stoichiometrically analyzed at the single-atom level using electron microscopy methods at the SuperSTEM laboratory. Atom by atom, this first-ever analysis resolved single Co atom sites that is responsible for promoting S removal from oil distillates. 

Zhu, Y., Ramasse, Q. M., Brorson, M., Moses, P. G., Hansen, L. P., Kisielowski, C. F. and Helveg, S. (2014), Visualizing the Stoichiometry of Industrial-Style Co-Mo-S Catalysts with Single-Atom Sensitivity. Angew. Chem. Int. Ed., 53: 10723–10727. doi: 10.1002/anie.201405690

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paper2_web_image

"Growth mechanism for single- and multi-layer MoS2 nanocrystals"

Understanding the how MoS2 nanocatalyst forms: The growth of MoS2 nanocrystals was monitored for the first time in situ using  in situ transmission electron microscopy. The findings explain why process parameters (such as temperature) can tune the relative fraction of single- and multi-layered MoS2 nanocrystals which is important for the use in hydrotreating reactions.

Lars P. Hansen, Erik Johnson, Michael Brorson, and Stig Helveg. The Journal of Physical Chemistry C 2014 118 (39), 22768-22773 DOI:10.1021/jp5069279
 

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acs

"Structure and Electronic Properties of In Situ Synthesized Single Layer MoS2 on a Gold Surface"

Growth and characterization of epitaxial, single layer MoS2 islands on Au(111): Epitaxial MoS2 islands on Au(111) were grown using physical vapor deposition in an H2S environment (10-6mbar). The moiré pattern resulting from the lattice mismatch and small relative rotation between the two materials was observed in STM as a hexagonal pattern of a 3.28 nm periodicity. From XPS it is concluded that MoS2 single layers on Au(111) overall retains structural and chemical properties of MoS2. Both XPS and STS indicate however a small modification in apparent bandgap size as a result of the underlying gold.

Signe G. Sørensen, Henrik G. Füchtbauer, Anders K. Tuxen, Alex S. Walton, and Jeppe V. Lauritsen. ACS Nano, 8, 7, 6788-6796 (2014).DOI: 10.1021/nn502812n

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