A5101627103- Spectroscopy and Laser Applications
- Particle Detector Development and Performance
- Particle physics theoretical and experimental studies
- Advancements in Battery Materials
- Laser-induced spectroscopy and plasma
- Advanced Battery Materials and Technologies
- Quantum Dots Synthesis And Properties
- Advanced Battery Technologies Research
- Superconducting Materials and Applications
- Geological and Geochemical Analysis
- Laser Design and Applications
- CCD and CMOS Imaging Sensors
- Particle Accelerators and Free-Electron Lasers
- earthquake and tectonic studies
- Spectroscopy Techniques in Biomedical and Chemical Research
- Advanced Thermoelectric Materials and Devices
- Photonic and Optical Devices
- Mass Spectrometry Techniques and Applications
- Optical Coherence Tomography Applications
- Atmospheric Ozone and Climate
- High-pressure geophysics and materials
- Carbon and Quantum Dots Applications
- Advanced Fluorescence Microscopy Techniques
- Magnesium Alloys: Properties and Applications
- Atmospheric and Environmental Gas Dynamics
TU Dresden
2014-2025
AstraZeneca (Singapore)
2025
University of Graz
2006-2023
RHI Magnesita (Austria)
2022
BMW Group (Germany)
2015-2017
University of Bayreuth
2017
BMW (Germany)
2015-2016
CREATe Centre
2012
Clausthal University of Technology
2006-2010
University of Würzburg
2008
Understanding reactions at the electrode/electrolyte interface (EEI) is essential to developing strategies enhance cycle life and safety of lithium batteries. Despite research in past four decades, there still limited understanding by what means different components are formed EEI how they influence layer properties. We review findings used establish well-known mosaic structure model for (often referred as solid electrolyte interphase or SEI) on negative electrodes including lithium,...
Increasing the areal capacity or electrode thickness in lithium ion batteries is one possible means to increase pack level energy density while simultaneously lowering cost. The physics that limit use of high as a function battery power ratio are poorly understood and thus most currently produced automotive cells utilize modest loadings ensure long life over vehicle operation. Here we show electrolyte transport limits utilization positive at critical C-rates during discharge; whereas,...
Self-assembled nanofibers of a chiral core-unsubstituted perylene bisimide dye exhibit an almost black color, which can be attributed to unusual packing motif based on slipped J-type aggregation.
All inorganic lead halide perovskite nanocrystals (PNCs) typically suffer from poor stability against moisture and UV radiation as well degradation during thermal treatment. The of PNCs can be significantly enhanced through polymer encapsulation, often accompanied by a decrease photoluminescence quantum yield (PLQY) due to the loss highly dynamic oleylamine/oleic acid (OLA/OA) ligands. Herein, we propose solution for this problem utilizing partially hydrolyzed poly(methyl methacrylate)...
The side reactions between the electrode materials and nonaqueous electrolytes have been major contributor to degradation of electrochemical performance lithium-ion batteries. A home-built high-precision leakage current measuring system was deployed investigate reaction kinetics delithiated LiNi0.6Mn0.2Co0.2O2 a conventional electrolyte. It found that rate parasitic had strong dependence on upper cutoff potential cathode material. kinetic data also indicated change mode at about 4.5 V vs Li+/Li.
The effect of dissolved Zn, Co, Pb, Mg, and Ca on the uptake cadmium by biogenic aragonite was investigated. Experiments were performed in batch-reactors using metal-cadmium-bearing solutions shell fragments with diameters different ranges, solid/liquid ratio being 10 grams per liter. Different initial concentrations metals (1.0−0.005 mM) used. Uptake takes place via heterogeneous nucleation metal-bearing crystallites onto surfaces. Cadmium removal occurs surface precipitation otavite. Under...
The angular distributions and the partial branching fraction of decay $B^{0} \rightarrow K^{*0} \mu^+ \mu^-$ are studied using an integrated luminosity $0.37\,fb^{-1}$ data collected with LHCb detector. forward-backward asymmetry muons, $A_{\mathrm{FB}}$, longitudinal polarisation, $F_{\mathrm{L}}$, fraction, $\mathrm{d}{\mathcal B}/\mathrm{d}q^{2}$, determined as a function dimuon invariant mass. measurements in good agreement Standard Model predictions most precise to date. In mass squared...
A set of high-energy lithium-ion pouch cells consisting thick Li(Ni0.6Mn0.2Co0.2)O2 (NMC622) cathodes and graphite anodes were cycled under 1C-rate charge 2C-rate discharge at room temperature. Fresh cycle aged characterized via various techniques, including cell capacity test, in-situ three-electrode electrochemical impedance spectroscopy (EIS). The ∼200 Wh/kg studied have a life ∼1419 cycles retention ∼75%. It is found that the fade can be into three stages: an initial stage fast drop,...
In this work, a model-experimental feedback approach is developed and applied to fabricate high-quality, warm-white light-emitting diodes based on quantum dots (QDs) as color-conversion materials. Owing their unique chemical physical properties, QDs offer huge potential for lighting applications. Nevertheless, both emission stability processability of the are limited upon usage from solution. Incorporating them into solid ionic matrix overcomes these drawbacks, while preserving initial...
Bismuth selenide‐based nanomaterials are promising candidates for the use as thermoelectrics, and, in addition to this, currently studied with respect their topological insulating behavior. Herein, it is reported on facile synthesis of composition‐tunable colloidal Bi 2 Se x nanocrystals by reacting selenium precursor dodecanethiol and oleylamine presynthesized nanoparticles. To best our knowledge, this first time that such a wide Bi‐to‐Se ratio‐tunability simultaneous control over...
[1] This study combines new data on tectonostratigraphy, macrostructures and microstructures, petrology, geochronology to propose a comprehensive model for the tectonometamorphic evolution of Rhodope orogen from Jurassic early Paleogene. Rocks two areas in central eastern Greek represent continental suture zone (Rhodope Suture Zone), with included material most likely forming an extensional allochthon south European continent during Permo/Triassic times that was subsequently subducted...
The material-efficient monolayers of transition-metal dichalcogenides (TMDs) are a promising class ultrathin nanomaterials with properties ranging from insulating through semiconducting to metallic, opening wide variety their potential applications catalysis and energy storage optoelectronics, spintronics, valleytronics. In particular, TMDs have great as emerging inexpensive alternatives noble metal-based catalysts in electrochemical hydrogen evolution. Herein, we report straightforward,...
Since the beginning of 1980s, colloidally synthesized quantum dots (QDs) have been in focus interest due to their possible implementation for color conversion, luminescent light concentrators, and lasing. For all these applications, QDs benefit from being embedded into a host matrix ensure stability usability. Many different materials used this purpose still individual shortcomings. Here, we present universal, fast, flexible approach direct incorporation wide range inorganic ionic crystals...
Recent developments of external cavity quantum cascade lasers (EC-QC lasers) enable new applications in laser spectroscopy trace gas species the mid-infrared spectral region. We report application quartz enhanced photo acoustic (QEPAS) with widely tuneable EC-QC as excitation sources for chemical sensing different such triacetone triperoxide (TATP). A pulsed operating at v∼1120cm-1 and a cw v∼950cm-1 are used detection explosive TATP which is mid infrared broad band absorber. The limit our...
Abstract We report a simple one‐pot method for the rapid preparation of sub‐10 nm pure hexagonal (β‐phase) NaYF 4 ‐based upconverting nanoparticles (UCNPs). Using Therminol ® 66 as co‐solvent, monodisperse UCNPs could be obtained in unusually short reaction times. By varying time and temperature, it was possible to control precisely particle size crystalline phase UCNPs. The upconversion (UC) luminescence properties nanocrystals were tuned by concentrations dopants (Nd 3+ Yb sensitizer ions...
The n‐type semiconductor system Bi 2 Te 3 Bi Se is known as a low‐temperature thermoelectric material with potentially high efficiency. Herein, facile approach reported to synthesize core/shell heterostructured Se/Bi nanosheets (NSs) lateral dimensions of 1–3 μm and thickness about 50 nm. , well NSs are obtained via colloidal synthesis. Heterostructured show an inhomogeneous distribution the chalcogen atoms forming selenium tellurium‐rich layers across NS thickness, resulting in structure....
Detection of explosives is an emerging task for maintaining civil security. Optical methods and especially tunable diode laser spectroscopy are discussed as means providing fast reliable data. Selective sensitive detection possible in the midinfrared spectral region; however, until recently, small easy to operate sources were not readily available applications outside laboratory. The situation changes with maturation quantum cascade lasers (QCLs). We present based on photofragmentation...