个人简介

Freie Universitat, Berlin, Germany - Vordiplom (1991) Fritz-Haber-Institute of the Max-Planck-Society, Berlin, Germany - Diploma Thesis (1995) Freie Universitat Berlin, Germany - Doctor Rerum Naturalis Paul-Drude-Institute for Solid State Electronics, Berlin, Germany - Postdoc. Fellow (1997-1998) Columbia University, New York, USA - Postdoc. Fellow (1998-2000) Awards 2004 UCR Faculty Development Award 2002 NSF Career Award 1998 Ramsauer Award

研究领域

Physical Chemistry/Analytical Chemistry/Computational Chemistry/Materials Chemistry

Research in the Bartels Lab addresses three different areas of surface chemistry, physics and materials science: the growth and properties of MoS2 and other metal dichalcogenides monolayers; the processes underlying ordering and self-assembly of molecular layers at metal surfaces; and the control of molecular motion at surface aiming at the development of molecular machines. MoS2 and other metal dichalcogenides have recently attracted a lot of attention, because even when they are only a single layer thick they are stable in air and natively semiconducting. Through research in graphene, techniques for testing and processing such materials have been developed. But graphene is a conductor, thus it cannot be directly used for transistors, solar cells and many other electronic/electrochemical applications where semiconductivity is required. Work in the Bartels group supports ongoing research efforts in metal dichalcogenies by growing single layer films of MoS2 and many related materials. We also explore their optical (excitonic) properties, because excitons in such films are important for optical/solar applications, and they also pose a facile means of obtaining insight into the electronic properties of the materials. While we can grow films on wafers in furnaces for a variety of electronic investigations, the explorations of the catalytic properties (and of materials processing in general) we conduct in vacuum. We use variable temperature scanning tunneling microscopy (STM) to get atomic scale insight into the structure and the binding of reactants to the surface of MoS2 and other molybdenum-sulfur compounds. Using photoelectron spectroscopy as well as thermal desorption we obtain information on their composition and reactivity. The investigation of molecular films at metals surfaces has revealed a host of novel physical and chemical phenomena: molecules can form coordination compounds at surfaces including ones with anionic (negatively-charged) metal centers typically not found in the solution phase; they can form networks utilizing hydrogen bonds involving, for instance, hydrogen atoms attached to aromatic rings, which in the solution phase are too weak to have structure-determining power; the arrangement of molecules in honeycombs can cause coalescence of electrons of the substrate into favorable quantum dots, thus driving the aggregation of the network in the first place. We constantly explore surface coverage by low-temperature STM to find new phenomena and understand them in physical detail. The control of molecular motion at surfaces has been our focus for a long time. We found and explored a range of substituted acenes (e.g., anthraquinone, dithio-anthracene) which can run across a flat, high-symmetry surfaces as if they were moving on straight tracks by means of sequential motion of their substrate linkers. Using this class of molecules, we explored the transport of cargo across surfaces, fundamental aspects of tunneling in the crossing of reaction barriers, microscopic reversibility and a range of other chemical themes. This work was widely reported on in general publications from the Financial Times to Scientific American.

近期论文

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2-Dimensional Transition Metal Dichalcogenides with Tunable Direct Band Gaps: MoS2(1-x)Se2x Monolayers, ADV. MAT. (2013) Atoms-First Curriculum: A Comparison of Student Success in General Chemistry, J. CHEM. ED. (2013) Facile growth of monolayer MoS2 film areas on SiO2, EUR. PHYS. J. (2013) Controlled argon beam-induced desulfurization of monolayer molybdenum disulfide, J. PHYS. COND. MAT. (2013) Growth of aligned Mo6S6 nanowires on Cu(111), SURF. SCI. (2013) From reciprocal space to real space in surface science, J. PHYS. COND. MAT. (2012) Ag3PO4 Oxygen Evolution Photocatalyst Employing Synergistic Action of Ag/AgBr Nanoparticles and Graphene Sheets, JPC (2012) Synthesis and Efficient Visible Light Photocatalytic Hydrogen Evolution of Polymeric g-C3N4 Coupled with CdS Quantum Dots, JPC (2012) Single layer MoS2 on the Cu(111) surface: First-principles electronic structure calculations, PHYS. REV. B (2012) Coalescence of 3-phenyl-propynenitrile on Cu(111) into interlocking pinwheel chains, JCP (2011) Toward the Growth of an Aligned Single-Layer MoS(2) Film, LANGMUIR (2011) Steric-Blocking as a Tool to Control Molecular Film Geometry at a Metal Surface , LANGMUIR (2011) Do Two-Dimensional Noble Gas Atoms Produce Molecular Honeycombs at a Metal Surface?, NANO LETT. (2011) Effective elastic properties of a van der Waals molecular monolayer at a metal surface, PHYS. REV. B (2010) Tunability in Polyatomic Molecule Diffusion through Tunneling versus Pacing , JACS (2010) Power of Confinement: Adsorbate Dynamics on Nanometer-Scale Exposed Facets, NANO LETT. (2010) Adsorbates in a Box: Titration of Substrate Electronic States, PRL (2010) Tailoring molecular layers at metal surfaces, NAT. CHEM. (2010) H-atom Position as Pattern-Determining Factor in Arenethiol Films, JACS (2009) Surface Diffusive Motion in a Periodic and Asymmetric Potential, JACS (2008) A Surface Coordination Network based on Substrate-Derived Metal Adatoms with Local Charge Excess, ANGEW. CHEM. (2008) A Quantitative Approach to Hydrogen Bonding at a Metal Surface, JACS (2007) A Molecule Carrier, SCIENCE (2007)