A5056393192- Force Microscopy Techniques and Applications
- Integrated Circuits and Semiconductor Failure Analysis
- Electron and X-Ray Spectroscopy Techniques
- Graphene research and applications
- Advanced Electron Microscopy Techniques and Applications
- Surface and Thin Film Phenomena
- Hybrid Renewable Energy Systems
- 2D Materials and Applications
- Physics of Superconductivity and Magnetism
- Quantum and electron transport phenomena
- Metal and Thin Film Mechanics
- Advanced Surface Polishing Techniques
- Semiconductor materials and devices
- Mechanical and Optical Resonators
- Ammonia Synthesis and Nitrogen Reduction
- Atomic and Subatomic Physics Research
- Membrane Separation Technologies
- X-ray Spectroscopy and Fluorescence Analysis
- Rare-earth and actinide compounds
- Ga2O3 and related materials
- Advancements in Solid Oxide Fuel Cells
- Crystallography and Radiation Phenomena
- Chemical and Physical Properties of Materials
- Photochromic and Fluorescence Chemistry
- Smart Materials for Construction
University of Vienna
2015-2021
Research Center for Non Destructive Testing (Austria)
2021
Forschungs- und Technologietransfer (Austria)
2013-2015
Plansee (Austria)
2015
TU Wien
2009-2013
Austrian Institute of Technology
2010
Kent State University
1995
We present here two alternative schemes designed to correct the high-frequency truncation errors in numerical treatment of Bethe-Salpeter equations. The are applicable all calculations with a local two-particle irreducible vertex, which is relevant, e.g., for dynamical mean-field theory (DMFT) and its diagrammatic extensions. In particular, within purely framework, we could extend existing algorithms treating static case particle-hole sector more general procedures bosonic frequencies...
Abstract We demonstrate the use of combined simultaneous atomic force microscopy (AFM) and laterally resolved Raman spectroscopy to study strain distribution around highly localised deformations in suspended two-dimensional materials. Using AFM tip as a nanoindentation probe, we induce few-layer graphene, which adopt membrane model system. Concurrently, visualise under situ using hyperspectral mapping via strain-dependent frequency shifts graphene’s G 2D bands. Thereby show how contact...
Accessing the thermal properties of materials or even full devices is a highly relevant topic in research and development. Along with ongoing trend toward smaller feature sizes, demands on appropriate instrumentation to access surface temperatures high lateral resolution also increase. Scanning microscopy one most powerful technologies fulfill this task down sub-100 nm regime, which, however, strongly depends nanoprobe design. In study, we introduce three-dimensional (3D) concept, which acts...
The effective crystal field in multiorbital correlated materials can be either enhanced or reduced by electronic correlations with crucial consequences for the topology of Fermi surface and, hence, on physical properties these systems. In this respect, recent local density approximation plus dynamical mean-field theory studies Ni-based heterostructure have shown contradicting results, depending whether less $p$ orbitals are included not. We investigate origin problem and identify key...
Abstract Two-dimensional (2D) antimony (Sb, “antimonene”) is of interest in electronics and batteries. Sb however exhibits a large allotropic structural diversity, which also influenced by its support. Thus, heterostructure formation key 2D integration. Particularly, Sb/graphene interfaces are important. We thus study here few-layered heterostructures with atomic resolution (scanning) transmission electron microscopy. find two morphologies to coexist: first, morphology layered β-Sb...
In this work, we report on the integration of an atomic force microscope (AFM) into a helium ion (HIM). The HIM is powerful instrument, capable imaging and machining nanoscale structures with sub-nanometer resolution, while AFM well-established versatile tool for multiparametric characterization. Combining two techniques opens way unprecedented in situ correlative analysis at nanoscale. Nanomachining can be performed without contamination sample environmental changes between processing...
Abstract A procedure for deconvolving the energy spread introduced by primary beam and analyzer in a reflection electron loss spectrum (REELS) has been developed. The is based on Richardson–Lucy (RL) algorithm. approach successfully tested experimental spectra comparison with an inherent high‐energy resolution. As typical result, it was found that effective resolution of full width half maximum (FWHM) elastic peak ∼1.5 eV raw data can be reduced to ∼0.7 deconvoluted spectra. Copyright © 2009...
Abstract Scanning probe microscopy (SPM) techniques are amongst the most important and versatile experimental methods in surface- nanoscience. Although their measurement principles on rigid surfaces well understood steady progress instrumentation has been made, SPM imaging suspended, flexible membranes remains difficult to interpret. Due interaction between tip membrane, morphological changes caused by can lead deformations of membrane during scanning hence significantly influence results....
The demand for clean and green energy has raised the consumption of hydrogen continuously during last years. Hydrogen is most economically produced in large scale systems by methane steam reforming followed pressure swing adsorption (PSA). However, with a rising small-scale production hydrogen, as down-scaling to smaller PSA-systems ( < 500 Nm3/h H2) not economic, substantial generation using palladium membranes emerged.Porous tubes made an oxide dispersion strengthened powder metallurgy...
Suspended membranes of two-dimensional (2D) materials are interest for many applications. Much their characterization relies on scanning probe microscopy (SPM) techniques such as atomic force (AFM) or tunneling (STM). Unlike rigid samples, the suspended atomically thin 2D are, however, flexible and do not remain mechanically undisturbed during SPM measurements. Local deformations can occur at location tip thus result in measurements that misrepresent actual membrane topography nanomechanical...
A number of azo-anil dyes the type with Y=CN or NO2 and R,R′=Me, Me; Me,C6H13; Et,Pr C6H13,C6,H13 were synthesized by reactions aminosubstituted nitrosoamine phenylene diamine followed condensation resulting aniline appropriate 4-substituted benzaldehyde. Mesomorphic properties determined both hot-stage polarizing microscopy DSC. nematic phase was observed only when R=R′=CH3 while smectic phases occurred in other homologs. Melting temperatures greater than 130°. All had colors ranging from...
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The atomic structure of disordered materials is one the remaining challenges in science due to difficulties related imaging non-repeating arrangements positions.In fact, since over 80 years, popular concept amorphous has been for a large part based on drawings random network by Zachariasen [1].
Micro power converters for energy recovery are increasingly important a number of future applications. The Austrian Institute Technology (AIT) is presently developing an innovative μ-scale turbine expander work in transcritical CO2 heat pumps. main drawback lower COP (coefficient performance) pumps compared to conventional pump systems can be compensated by utilizing the pressure difference between high and low part recovery. Work realized substituting expansion valve side Pelton with...