A5075838731- Advancements in Battery Materials
- Advanced Battery Technologies Research
- Catalytic Processes in Materials Science
- Electron and X-Ray Spectroscopy Techniques
- Metal-Organic Frameworks: Synthesis and Applications
- Advanced Battery Materials and Technologies
- High Entropy Alloys Studies
- Gas Sensing Nanomaterials and Sensors
- Advanced Electron Microscopy Techniques and Applications
- Polymer Nanocomposites and Properties
- Nuclear Materials and Properties
- High-Temperature Coating Behaviors
- Additive Manufacturing Materials and Processes
- ZnO doping and properties
- Advanced ceramic materials synthesis
- Microwave-Assisted Synthesis and Applications
- Magnetic Properties and Synthesis of Ferrites
- Nanomaterials for catalytic reactions
- Metal and Thin Film Mechanics
- High Temperature Alloys and Creep
- Iron oxide chemistry and applications
- CO2 Sequestration and Geologic Interactions
- Welding Techniques and Residual Stresses
- Advanced Chemical Sensor Technologies
- Electronic and Structural Properties of Oxides
Karlsruhe Institute of Technology
2015-2024
Institute of Nanotechnology
2016
FZI Research Center for Information Technology
2004-2008
FIZ Karlsruhe – Leibniz Institute for Information Infrastructure
2005
For inorganic semiconductors crystalline order leads to a band structure which gives rise drastic differences the disordered material. An example is presence of an indirect gap. organic such effects are typically not considered, since bands normally flat, and band-gap therefore direct. Herein we show results from electronic calculations demonstrating that ordered arrays porphyrins reveal small dispersion occupied unoccupied leading formation We demonstrate herein structures can be fabricated...
Conducting polymers (CPs) have frequently been described as outstanding coating materials for neural microelectrodes, providing significantly reduced impedance or higher charge injection compared to pure metals. Usability has until now, however, limited by poor adhesion of like poly(3,4-ethylenedioxythiophene) (PEDOT) metallic substrates, ultimately precluding long-term applications. The aim this study was overcome weakness CPs introducing two novel improvement strategies that can easily be...
In this review, microwave plasma gas-phase synthesis of inorganic materials and material groups is discussed from the application-oriented perspective a scientist: why how plasmas are applied for materials? First, key players in research field will be identified, brief overview on publication history topic given. The fundamental basics, necessary to understand processes ongoing particle synthesis—one main applications processes—and influence relevant experimental parameters resulting...
Here we report on the impact of reducing crystalline size structural and magnetic properties γ-Fe
Abstract The morphology of the electrolyte‐filled pore space in lithium‐ion batteries is determined by solid microstructure formed μm‐sized active material particles and smaller‐featured carbon binder domain (CBD). Tomographic reconstructions have largely neglected CBD, resulting inadequately defined morphologies at odds with experimental ionic tortuosity values. We present a three‐phase reconstruction LiCoO 2 composite cathode focused ion‐beam scanning electron microscopy tomography....
This work presents a comparative surface analytical study on the solid electrolyte interphase (SEI) composition influenced by additives in using nanoparticulate SnO2 as anode active material for lithium-ion batteries (LIBs). In particular, lithium bis(trifluoromethanesulfonyl)imide (LiTFSI)-based electrolytes combination with vinylene carbonate (VC) and 1-fluoroethylene (FEC) are used. The SEI of electrodes is investigated at two different aging stages means complementary X-ray photoelectron...
Abstract Bei anorganischen Halbleitern führt kristalline Ordnung zur Bildung einer elektronischen Bandstruktur, die deutliche Unterschiede zu ungeordnetem Material aufweist; z. B. können indirekte Bandlücken auftreten. organischen werden solche Effekte üblicherweise nicht in Betracht gezogen, da Bänder der Regel flach sind und Bandlücke daher direkt ist. Wir präsentieren hier genaue Berechnungen Struktur, zeigen, dass geordnete Porphyrinstrukturen eine geringe Dispersion besetzter...
Structure, phase transformations, grain growth, and defects of bare alumina-coated nanoparticles $\mathrm{Hf}{\mathrm{O}}_{2}$ $\mathrm{Zr}{\mathrm{O}}_{2}$ synthesized in a microwave-plasma process have been investigated by x-ray diffraction (XRD), transmission electron microscopy (TEM), perturbed angular correlation (PAC) spectroscopy. The PAC technique was used to measure the electric quadrupole interactions (QIs) nuclear probes $^{181}\mathrm{Ta}$ $^{111}\mathrm{Cd}$ nanocrystalline as...
We report on a strain-induced martensitic transformation, accompanied by suppression of magnetic order in epitaxial films chemically disordered FeRh. X-ray diffraction, transmission electron microscopy and electronic structure calculations reveal that the lowering symmetry (from cubic to tetragonal) imposed relation leads further, unexpected, tetragonal-to-orthorhombic transition, triggered band-Jahn-Teller-type lattice instability. The collapse is direct consequence this structural change,...
Nanolaminates composed of alternating layers ZnO and Al2O3 are grown by conformal atomic-layer deposition. Their structural nonlinear optical properties correlated. Optimized nanolaminates exhibit an effective bulk second-order susceptibility that is independent the substrate five times larger than potassium dihydrogen phosphate. As a service to our authors readers, this journal provides supporting information supplied authors. Such materials peer reviewed may be re-organized for online...
Photochemical reactions typically proceed via multiple reaction pathways, yielding a variety of isomers and products. Enhancing the selectivity is challenging. Now, potential supramolecular control for oxidative photocyclization tetraarylethylene, containing stereogenic -C=C- bond, demonstrated. In solution, this photochemical produces three constitutional (substituted phenanthrenes), with slow kinetics. When reactant assembled into crystalline framework, only one product forms accelerated...
Abstract A laser‐based procedure for the preparation of metallic hierarchical porous materials is introduced and exemplified on tin, copper, silicon, titanium, tungsten surfaces to demonstrate its general applicability. The impact suitably tuned nanosecond laser pulses triggers a process in which laser‐induced metal ablation instantaneous recondensation partially oxidized metals lead cauliflower‐like superstructures comprising hybrid micro‐/nanopatterning. Repeated scanning with intense...
The performance of a composite battery electrode depends strongly on the morphology its liquid electrolyte-filled pore space, where ion transport takes place. Ion limitations within space are quantified by tortuosity, which can be determined from diffusion simulations in reconstructed or through electrochemical impedance spectroscopy (EIS) using, for example, transmission line model. Although rarely directly compared, tortuosities two approaches have so far been lacking agreement, raising...