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Katharina Kaiser (IBM Research)06/09/2023, 17:00Surfaces, Interfaces and Thin FilmsTalk
Cyclo[n]carbons were predicted for decades to exist. Although a synthetic route was elaborated in the 1980’s, and glimpses of cyclocarbons were detected in gas phase, they could never be stabilized long enough for characterization.
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AFM and STM at low temperatures allow triggering certain on-surface chemical reactions by atom manipulation and can facilitate the controlled formation of highly... -
Igor Sokolovic (Institute of Microelectronics + Institute of Applied Physics, TU Wien, Vienna, Austria)06/09/2023, 17:30Surfaces, Interfaces and Thin FilmsTalk
In this research, surfaces of van-der-Waals-bonded single-crystal PtSe$_2$ cleaved in ultrahigh vacuum (UHV) were studied with non-contact atomic force microscopy (ncAFM) to simultaneously reveal their atomic and electronic structure. Typical ionic and electronic defects present on the cleaved surfaces were characterized with single-atom precision to reveal the proclivity of the layered...
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Claudia López-Posadas (Institute of Experimental Physics, Johannes Kepler University Linz)06/09/2023, 17:45Surfaces, Interfaces and Thin FilmsTalk
We have studied 5,14-dihydro-5,7,12,14-tetraazapentacene (DHTAP) layers on the regularly patterned Cu(110)-(2x1)O stripe phase. Using Reflectance Difference Spectroscopy (RDS) and Scanning Tunneling Microscopy (STM) we find that the DHTAP molecules preferentially adsorb on the Cu(110) stripes, with their long molecular axis aligned parallel to the [-110]-direction. In contrast, on the...
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Dr Moritz Eder (Institute of Applied Physics, TU Wien)06/09/2023, 18:00Surfaces, Interfaces and Thin FilmsTalk
We investigated the surface (photo)chemistry of alcohols on TiO$_{2}$(110) and recently Fe$_{2}$O$_{3}$(012) single crystals in ultra-high vacuum. Our studies focused on the role of the metal co-catalyst in the photocatalytic reaction by comparing the reactivity of bare and metal-decorated surfaces. We show that photocatalytic reactions are not merely a couple of redox reactions, but an...
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Martin Heinrich (Paul Scherrer Institute)06/09/2023, 18:15Surfaces, Interfaces and Thin FilmsTalk
GeTe is a IV-VI semiconductor compound with existing applications in optoelectronics and thermoelectrics. In addition to ferroelectricity and a large Rashba spin splitting in GeTe, doping with Mn atoms introduces ferromagnetism, which makes Ge1-xMnxTe a magnetoelectric multiferroic with coupled electric and magnetic polarization and a promising candidate for spintronic applications.
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In this... -
Dr Francesco Presel (University of Graz)06/09/2023, 18:30Surfaces, Interfaces and Thin FilmsTalk
In previous research, we have shown that single-layer Au nanoislands on ultrathin MgO/Ag(001) can catalyze activation of $CO_2$ to oxalate $(CO_2)_2$- — a stable intermediate for chemicals and synthetic fuels — even below room temperature.
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Here we identified with STM the oxalate species present on the surface after reaction, which was only observed in presence of single-layer Au islands after... -
Philipp Maier (Institute of Experimental Physics, Graz University of Technology)06/09/2023, 18:45Surfaces, Interfaces and Thin FilmsTalk
The high scattering cross section of neutron and helium beams towards hydrogen provides experimental access to the structure and dynamics of hydrogen containing molecules at carbon materials, including e.g. the molecular motion of water. I will present experimental and theoretical results of hydrogen containing molecules ad-sorbed on carbon surfaces. These include the structure and dynamics of...
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Chunlei Wang (Institute of Applied Physics, TU Wien, Austria)06/09/2023, 19:00Surfaces, Interfaces and Thin FilmsTalk
The adsorption of ethylene (C2H4) is a crucial step in many important industrial reactions. Recently, novel single-atom Rh1 heterogeneous catalysts have shown excellent activity and selectivity for hydroformylation reactions (e.g., C2H4 + CO + H2 = CH3CH2CHO). However, a fundamental understanding of the catalytic mechanisms remains elusive. As a first step towards this goal, Rh1 adatoms were...
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Panukorn Sombut06/09/2023, 19:15Surfaces, Interfaces and Thin FilmsTalk
Understanding the interaction between reactant molecules and “single-atom” active sites is important for comprehending the evolution of single-atom catalysts in reactive atmospheres. Here, we study the interaction between CO and Rh$_{1}$ and Rh$_{2}$ species supported by Fe$_{3}$O$_{4}$(001) using DFT and experimental surface science techniques. Stable Rh$_{1}$(CO)$_{1}$ is formed via CO...
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Christian Teichert (Chair of Physics, Montanuniversität Leoben)07/09/2023, 14:00Surfaces, Interfaces and Thin FilmsTalk
Recently, we demonstrated weak ferromagnetism in two-dimensional Fe:talc at room temperature and proposed iron-rich phyllosilicates as a promising platform for air-stable magnetic monolayers [1]. Since these minerals are rather rare and hard to synthesize, we suggest ion implantation to tailor the phyllosilicates’ magnetic properties. Nonmagnetic, iron-free single-crystalline talc bulk samples...
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Roland Resel07/09/2023, 14:30Surfaces, Interfaces and Thin FilmsTalk
The class of benzothieno-benzothiophene (BTBT) type molecules are among the best performing organic semiconductors in thin film transistors. The asymmetry of the molecule induces specific thin film forming properties and unique crystallographic features. We see the nucleation of the thermodynamic stable phase at the substrate surface and a transition to a metastable phase at the subsequent...
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Dr Gyanendra Panchal (PSI)07/09/2023, 14:45Surfaces, Interfaces and Thin FilmsTalk
We report the effect of inserting LaMnO$_3$ and La$_{0.45}$Sr$_{0.55}$MnO$_3$ buffer layers on the magnetic properties of epitaxial ultrathin La$_{0.8}$Sr$_{0.2}$MnO$_3$ films on SrTiO$_3$(001) substrate. The LaMnO$_3$ induces a bulk-like magnetic moments for La$_{0.8}$Sr$_{0.2}$MnO$_3$ down to 1uc thickness, the La$_{0.45}$Sr$_{0.55}$MnO$_3$ induces antiferromagnetic order on the first 3uc...
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Hang Li07/09/2023, 15:00Surfaces, Interfaces and Thin FilmsTalk
Transition metal oxide (TMO) exhibit exotic physical properties, which generally originated from the strong interplay between the charges, spins, orbitals, and lattice degrees of freedom. Therefore, developing methods for manipulating this coupling yields opportunities for realizing many novel quantum phenomena. Recent studies establish routes to exfoliate free-standing TMO membranes, raising...
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Jonas Knobel (University of Fribourg)07/09/2023, 15:15Surfaces, Interfaces and Thin FilmsTalk
Heterostructures consisting of the high-$\mathrm{T_C}$ superconductor $\mathrm{YBa_2Cu_3O_{7-\delta}}$ (YBCO) and the iridate $\mathrm{Sr_2IrO_4}$ (SIO) have been predicted to host induced superconducting spin-triplet or Majorana bound states and to find applications in devices such as superconducting diodes.
Using X-ray Absorption Spectroscopy, we observe a large charge transfer in...
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Jeong Ha Hwang07/09/2023, 15:30Surfaces, Interfaces and Thin FilmsTalk
Raman spectroscopy has been widely used to characterize graphene nanoribbons (GNRs) as it is possible to probe GNR quality from growth in ultra-high vacuum (UHV) until device integration. However, implementing this technique to study GNRs intrinsic spectroscopic properties remains challenging, as their synthesis requires UHV environment and many of these GNRs are reactive and air-sensitive....
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Dominik Lüthi (EMPA)07/09/2023, 15:45Surfaces, Interfaces and Thin FilmsTalk
Atomically precise graphene nanoribbons (GNRs) have been synthesized by on surface-synthesis of specific precursors on metallic substrates in ultra-high vacuum (UHV). The enhanced chemical reactivity of zigzag edge states of reactive GNRs has hindered their transfer and device integration.
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Here, we studied the intercalation of various GNRs with carbenes (BIM) as a promising route towards... -
Noah J. Hourigan (Graz University of Technology, Institute of Experimental Physics)07/09/2023, 16:00Surfaces, Interfaces and Thin FilmsTalk
Graphene can be grown via chemical vapour deposition on a silicon carbide substrate; thereafter, various elements can be intercalated between the graphene and the substrate. Here, we investigate bilayer graphene atop either intercalated 2D polar gallium, an intercalated hydrogen layer, or a simple carbon buffer layer. Using helium atom scattering (HAS) we probe surface characteristics such as...
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Fabian Paschke (IBM Research Europe - Zurich)07/09/2023, 17:00Surfaces, Interfaces and Thin FilmsTalk
In this work we use a CO tip to study the appearance of frontier molecular orbitals of pentacene as a function of the tip-sample distance. STM constant-height imaging reveals a transition from p- to s-wave dominated tunneling. We present a simple model that reproduces the distance-dependency due to the symmetry-dependent decay lengths of the CO tip states. The findings provide an...
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Dr Bareld Wit (Institute of Semiconductor and Solid State Physics, Johannes Kepler University Linz, Austria)07/09/2023, 17:15Surfaces, Interfaces and Thin FilmsTalk
Recent advances in near-field scanning microwave microscopy enable characterisation of nanoscale functional materials, surfaces, and nanoelectronic devices up to GHz frequencies and with sub-micron resolution. Material properties, including dielectric permittivity and dopant concentration have been detected in a microwave-adapted atomic force microscope at ambient conditions. We show our...
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Josef Simbrunner (Medical University Graz)07/09/2023, 17:30Surfaces, Interfaces and Thin FilmsTalk
While the crystalline properties of an epitaxially grown thin film can be studied in three dimensions by X-ray methods like grazing incidence X-ray diffraction (GIXD), the first monolayer is only accessible by surface sensitive methods that allow the determination of a two-dimensional lattice like low-energy electron diffraction (LEED). GIXD measurements with sample rotation on epitaxially...
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Jiri Pavelec (Vienna University of Technology)07/09/2023, 17:45Surfaces, Interfaces and Thin FilmsTalk
This study presents a new Infrared Reflection Absorption Spectroscopy (IRAS) setup for investigating adsorption on "single-atom" catalysts, addressing the challenges of low reflectivity from oxide supports and sub-monolayer coverage of adsorbates. The setup features improvements such as a high numerical aperture, optimized optical path, controlled incidence angle range, and high mechanical...
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Alexander Syböck07/09/2023, 18:00Surfaces, Interfaces and Thin FilmsTalk
Contaminants and other gases are known to greatly affect surface tension values. We have developed a way to measure the surface tension of ultra-clean liquids in contact with their pure gaseous phases. The liquid is condensed onto a small cryostat in a vacuum chamber. A pendant drop is formed and photographed allowing the surface tension of the ultra-pure liquid to be directly determined....
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Luis Rosillo07/09/2023, 18:15Surfaces, Interfaces and Thin FilmsTalk
In this work we look at the response of the surface band-bending of the ZnO single crystal polar faces (0001) and (000-1), in contact with an electrolyte, to a variation of charge at the solid-liquid interface by analyzing the effect of the inner electric fields on the excitonic dielectric function using in-situ spectroscopic ellipsometry.
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Discrete excitons on ZnO have a binding energy of... -
Paul Ryan07/09/2023, 18:30Surfaces, Interfaces and Thin FilmsTalk
Normal incidence X-ray standing waves (NIXSW) was used to directly determine the adsorption height of adsorbed H2O and OH on the α-Fe2O3(012)-(1x1) surface. The H2O and terminal OH both sit at the same adsorption height (1.45Å and 1.46Å respectively). The bridging OH is found sitting essentially in plane with a projected bulk surface (0.01Å) implying little surface relaxation.
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This data... -
Giulio de Vito07/09/2023, 18:45Surfaces, Interfaces and Thin FilmsTalk
2D-flakes exhibit among the highest thermal conductivity in materials, which make them suitable for heat dissipation in microchip processes. However, it is challenging to produce thin homogenous flakes or transferring one flake onto a target because of the risk of damaging or contaminating the material. Thus, it is important to characterize the intrinsic properties of the materials with a...
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