A5073852254- Advanced Electron Microscopy Techniques and Applications
- Orbital Angular Momentum in Optics
- Particle Accelerators and Free-Electron Lasers
- Near-Field Optical Microscopy
- Advancements in Solid Oxide Fuel Cells
- Particle accelerators and beam dynamics
- Magnetic properties of thin films
- Electronic and Structural Properties of Oxides
- Catalytic Processes in Materials Science
- Electron and X-Ray Spectroscopy Techniques
- Quantum and electron transport phenomena
- Metal and Thin Film Mechanics
- Electrocatalysts for Energy Conversion
- Plasmonic and Surface Plasmon Research
- Characterization and Applications of Magnetic Nanoparticles
- Advanced X-ray Imaging Techniques
- Microfluidic and Bio-sensing Technologies
- Advanced materials and composites
- Experimental and Theoretical Physics Studies
- Gyrotron and Vacuum Electronics Research
- Optical Coatings and Gratings
- Terahertz technology and applications
- Photonic and Optical Devices
- Surface and Thin Film Phenomena
- Fuel Cells and Related Materials
TU Wien
2016-2025
Georgi Nadjakov Institute of Solid State Physics
2016
Institute for Solid State Physics and Optics
2016
Österreichisches Forschungsinstitut für Chemie und Technik
2015
Austrian Centre for Electron Microscopy and Nanoanalysis
2015
Compound materials, such as transition-metal (TM) carbides, are anticipated to be effective electrocatalysts for the carbon dioxide reduction reaction (CO2RR) useful chemicals. This expectation is nurtured by density functional theory (DFT) predictions of a break key adsorption energy scaling relations that limit CO2RR at parent TMs. Here, we evaluate these prospects hexagonal Mo2C in aqueous electrolytes multimethod experiment and approach. We find surface oxide formation completely...
Recent advancements in time-resolved electron and photon detection enable novel correlative measurements of electrons their associated cathodoluminescence (CL) photons within a transmission microscope. These studies are pivotal for understanding the underlying physics coherent CL processes. We present experimental investigations energy-momentum conservation on single particle level, achieved through coincidence electron-photon pairs. This not only enables unprecedented clarity detecting weak...
Carbon deposition due to the inverse Boudouard reaction (2CO → CO2 + C) has been studied on yttria-stabilized zirconia (YSZ), Y2O3, and ZrO2 in comparison CH4 by a variety of different chemical, structural, spectroscopic characterization techniques, including electrochemical impedance spectroscopy (EIS), Fourier-transform infrared (FT-IR) imaging, Raman spectroscopy, electron microscopy. Consentaneously, all experimental methods prove formation more or less conducting carbon layer (depending...
Nanometer-sized and stable thiolate-protected cobalt clusters were synthesized by a wet chemical method, leading to pink solution with well-defined optical activity (ultraviolet–visible) photoluminescence. The cluster core of ∼1.3 nm size was metallic (as indicated scanning transmission electron microscopy, tunneling X-ray photoelectron spectroscopy, electron-energy loss spectroscopy) surrounded specific configuration thiolate staples (according Raman spectra, Fourier transfrom infrared...
Over the past few years, electron ptychography has drawn considerable attention for its ability to recover high contrast and ultra-high resolution images without need quality optics. In this Letter, we focus on ptychography's other potential benefits: quantitatively mapping phase variations resulting from magnetic electric fields over extended of view. To end, propose an implementation near-field that employs amplitude mask located in microscope's condenser aperture plane. We demonstrate...
In light optics, beams with orbital angular momentum (OAM) can be produced by employing a properly-tuned two-cylinder-lens arrangement, also called $\pi$/2 mode converter. It is not possible to convey this concept directly the beam in an electron microscope due non-existence of cylinder lenses commercial transmission (TEM). A viable work-around are readily-available optical elements form quadrupole lenses. proof-of-principle experiment 2012, it has been shown that single combination Hilbert...
The topological charge <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>m</mml:mi></mml:math> of vortex electrons spans an infinite-dimensional Hilbert space. Selecting a two-dimensional subspace spanned by xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>m</mml:mi><mml:mo>=</mml:mo><mml:mo>&#x00B1;</mml:mo><mml:mn>1</mml:mn></mml:math>, beam electron in transmission microscope (TEM) can be considered as quantum bit (qubit) freely propagating the column. A...
A modular high vacuum chamber dedicated to thin film deposition is presented. We detail the and gas infrastructure required operate two highly flexible chambers simultaneously, with a focus on evaporation techniques (thermal electron beam) magnetron sputtering, including baking equipment remove residual water from chamber. The use of O-ring-sealed flat flanges allows tool-free assembly process, in turn enabling rapid changes whole setup. This leads flexibility regarding as can be adapted...
This work studies the elastic scattering behavior of electron vortices when propagating through amorphous samples. A formulation multislice approach in cylindrical coordinates is used to theoretically investigate redistribution intensity between different angular momentum components due scattering. To corroborate and elaborate on our theoretical results, extensive numerical simulations are performed three model systems (Si 3 N 4 , Fe 0.8 B 0.2 Pt) for a wide variety experimental parameters...
Intermetallic clathrates are candidate materials for thermoelectric applications above room temperature. Here we explore whether their intrinsically low lattice thermal conductivities can be further reduced by nanostructuring and this enhance performance.}{As bulk routes studied melt spinning ball milling. To optimize the compaction process and/or stabilize nanostructure varied parameters, used additives, clathrate-based composites. Initial results on clathate nanowires as simpler model...
The present paper describes the improvement of performances boron powder obtained applying freeze-drying process (FDP) for nanostructuration and doping B2O3, which is here used as precursor. After process, B2O3 reduced to elemental nanoboron (nB) through magnesiothermic reaction with Mg. For this work, usefulness was tested focusing on carbon-doping (C-doping), using Cblack, inulin haemoglobin C sources. choice these molecules, their concentration, size shape, aims at producing improvements...
Implementing Stimulated Raman Scattering in a hollow-core fiber and spectral focusing long nonlinear crystal, we generate narrowband tunable ultrafast pulses for selective excitation of electric or magnetic dipole transitions FIB-fabricated Eu 3+ Y 2 O 3 nanostructure.
Controlling the surface state of bimetallic exsolution nanoparticles to either enhance or inhibit reaction kinetics H 2 oxidation/H O splitting by applying a voltage.