A5069634635- Electron and X-Ray Spectroscopy Techniques
- Advanced Electron Microscopy Techniques and Applications
- Advanced Materials Characterization Techniques
- Gold and Silver Nanoparticles Synthesis and Applications
- Integrated Circuits and Semiconductor Failure Analysis
- Aluminum Alloy Microstructure Properties
- Plasmonic and Surface Plasmon Research
- Near-Field Optical Microscopy
- Non-Destructive Testing Techniques
- Advanced Memory and Neural Computing
- Semiconductor materials and devices
- Organic Electronics and Photovoltaics
- nanoparticles nucleation surface interactions
- Quantum, superfluid, helium dynamics
- Ferroelectric and Negative Capacitance Devices
- Force Microscopy Techniques and Applications
- Silicon Carbide Semiconductor Technologies
- Microstructure and mechanical properties
- Electrostatic Discharge in Electronics
- Ion-surface interactions and analysis
- Neuroscience and Neural Engineering
- Quantum Dots Synthesis And Properties
- Electronic and Structural Properties of Oxides
- Nanowire Synthesis and Applications
- Surface and Thin Film Phenomena
Graz University of Technology
2015-2025
Austrian Centre for Electron Microscopy and Nanoanalysis
2014-2023
Brandenburg University of Technology Cottbus-Senftenberg
2019
Kiel University
2019
Technische Universität Ilmenau
2019
Elmos Semiconductor (Germany)
2019
Fachhochschule Kiel
2019
University of Graz
2014
CEA Grenoble
2011-2013
CEA LETI
2011-2013
Abstract Structure, shape and composition are the basic parameters responsible for properties of nanoscale materials, distinguishing them from their bulk counterparts. To reveal these in three dimensions at nanoscale, electron tomography is a powerful tool. Advancing to atomic resolution an aberration-corrected transmission microscope remains challenging has been demonstrated only few times using strong constraints or extensive filtering. Here we demonstrate on silver/gold core/shell...
Plasmons can drive chemical reactions by directly exciting intramolecular transitions. However, strong coupling of plasmons to single molecules remains a challenge as ultrasmall mode volumes are required. In the presented work, we propose Cu-Pd plasmonic network metamaterials scalable platforms for plasmon-assisted catalysis. Due absence translational symmetry, these networks provide unique environment featuring large local density optical states and an unparalleled hotspots that effectively...
3D elemental maps and EELS EDS spectrum volumes of an Al–Si-based alloy are reconstructed using analytical electron tomography.
Semiconducting nanowires have unique properties that are distinct from their bulk counterparts, but realization of full potential will be ultimately dictated by the ability to control nanowire structure, composition, and size with high accuracy. Here, we report a simple, yet versatile, approach modulate in situ diameter, length, composition individual segments within (In,Ga)N tuning seed particle supersaturation via supply III V sources during growth. By elucidating underlying mechanisms...
The photonic local density of states (LDOS) governs the enhancement light-matter interaction at nanoscale, but despite its importance for nanophotonics and plasmonics experimental imaging remains extremely challenging. Here we introduce a tomography scheme based on electron microscopy that allows retrieval three-dimensional plasmonic nanoparticles with nanometre spatial sub-eV energy resolution. From conventional experiments obtain morphology nanostructure, use this information to compute an...
Micrometer sized helium droplets provide an extraordinary environment for the growth of nanoparticles. The method promises great potential preparation core-shell particles as well one-dimensional nanostructures, which agglomerate along quantum vortices, without involving solvents, ligands, or additives. Using a new apparatus, enables us to record mass spectra heavy dopant clusters (>10(4) amu) and produce samples transmission electron microscopy simultaneously, we synthesize bare bimetallic...
Multi-modal TGV reconstruction of 3D EDX elemental maps.
Plasmonic gap modes provide the ultimate confinement of optical fields. Demanding high spatial resolution, direct imaging these was only recently achieved by electron energy loss spectroscopy (EELS) in a scanning transmission microscope (STEM). However, conventional 2D STEM-EELS is sensitive to components photonic local density states (LDOS) parallel trajectory. It thus insensitive specific modes, restriction that lifted with introduction tomographic 3D EELS imaging. Here, we show tomography...
Tailoring vacancies is a feasible way to improve the mechanical properties of ceramics. However, high concentrations usually compromise strength (or hardness). We show that elasticity and flexural could be achieved simultaneously using nitride superlattice architecture with disordered anion up 50%. Enhanced primarily result from distinctive deformation mechanism in ceramics, i.e., unit-cell disturbances. Such disturbance substantially relieves local high-stress concentration, thus enhancing...
Electron tomography in combination with electron energy-loss spectroscopy (EELS) experiments and simulations was used to unravel the interplay between structure plasmonic properties of a silver nanocuboid dimer. The precise 3D geometry particles fabricated by means beam lithography reconstructed through tomography, full three-dimensional information as an input for spectra plasmon resonance maps. Excellent agreement experiment theory found throughout, bringing comparison EELS imaging...
While phonons and their related properties have been studied comprehensively in bulk materials, a thorough understanding of surface for nanoscale objects remains elusive. Infra-red imaging methods with photons or electrons exist, which can map these vibrational excitations down to the individual atom scale. However, no technique so far was able directly reveal complete three-dimensional vectorial picture phononic electromagnetic density states from nanostructured object. Using highly...
We report the fabrication and characterization of chemical vapor deposition (CVD) grown silicon nanowires capacitors using a complementary-metal-oxide-semiconductor (CMOS) circuit interconnect level compatible process. Silicon have been by CVD on metallic lines used in today's CMOS circuits at low temperature (<425 °C) copper as catalyst. The nanowire assembly develops huge surface leading to very high measured capacitance densities reaching 18 μF/cm2, featuring ×23 gain when compared same...
A solar energy conversion system, an organic tandem cell, and electrochemical storage alkali metal-ion battery, were designed implemented in integrated hybrid photorechargeable battery for simultaneous storage. As a proof of concept, the power pack was successfully realized three-terminal assembly featuring two negative joint positive electrode. The device can be directly charged upon illumination (photocharging) discharged on external load many cycles. Aspects requirements related to...
We report on the nanoparticle-size-dependent onset of quantum tunneling electrons across subnanometer gaps in three different sizes (30, 50, and 80 nm) highly uniform gold nanosphere (AuNS) dimers. For precision plasmonics, gap distance is systematically controlled at level single C-C bonds via a series alkanedithiol linkers (C2-C16). Parallax-corrected high-resolution transmission electron microscope (HRTEM) imaging subsequent tomographic reconstruction are employed to resolve nm subnm...
Abstract Tomography is a standard and invaluable technique that covers large range of length scales. It gives access to the inner morphology specimens three-dimensional (3D) distribution physical quantities such as elemental composition, crystalline phases, oxidation state, or strain. These data are necessary determine effective properties investigated heterogeneous media. However, each tomographic relies on severe sampling conditions principles require sample be adequately shaped. For...
Core-shell structured Fe nanoparticles (NPs) produced by high pressure magnetron sputtering gas condensation were studied using transmission electron microscopy (TEM) techniques, diffraction, energy-loss spectroscopy (EELS), tomographic reconstruction, and Wulff shape construction analysis. The core-shell structure, which is composed of an core surrounded a maghemite (γ-Fe2O3) and/or magnetite (Fe3O4) shell, was confirmed fast Fourier transform (FFT) analysis combined with EELS. It found...
Abstract Plasmonic nanoparticles reveal unique optical properties and are increasingly incorporated into commercial products technologies, ranging from photovoltaics to biological chemical sensors. Shifting tuning their plasmonic response according the targeted application strongly depends on ability control geometry in every detail has not been reliably demonstrated for complex 3D nano‐architectures yet. Following that motivation, it herein presents how Focused Electron Beam Induced...
Oxygen contamination is a problem which inevitably occurs during severe plastic deformation of metallic powders by exposure to air. Although this can change the morphology and properties consolidated materials, there lack detailed information about behavior oxygen in nanocrystalline alloys. In study, aberration-corrected high-resolution transmission electron microscopy associated techniques are used investigate situ heating highly strained Cu-Fe Contrary expectations, oxide formation prior...
Sputter deposition is one of the most important techniques for fabrication memristive devices. It allows us to adjust concentration defects within fabricated metal-oxide thin film layers. The defect those devices whose resistance changes during device operation due drift ions active layer while an electric field applied. Reversible change property used in neuromorphic circuits emulate synaptic behavior. These novel bioinspired hardware architectures are ascertained terms advantageous...
Abstract Memristive devices are under intense development as non‐volatile memory elements for extending the computing capabilities of traditional silicon technology by enabling novel primitives. In this respect, interface‐based memristive promising candidates to emulate synaptic functionalities in neuromorphic circuits aiming replicate information processing nervous systems. A device composed Nb/NbO x /Al 2 O 3 /HfO /Au that shows features like analog switching, no electro‐forming, and high...