A5078536959- Semiconductor materials and devices
- Electronic and Structural Properties of Oxides
- Advanced Memory and Neural Computing
- Ferroelectric and Negative Capacitance Devices
- Astro and Planetary Science
- Neuroscience and Neural Engineering
- Diamond and Carbon-based Materials Research
- Planetary Science and Exploration
- Catalytic Processes in Materials Science
- Asymmetric Hydrogenation and Catalysis
- Electrocatalysts for Energy Conversion
- Geological and Geochemical Analysis
- Carbon dioxide utilization in catalysis
- GaN-based semiconductor devices and materials
- Advanced battery technologies research
- Semiconductor materials and interfaces
- ZnO doping and properties
- Thin-Film Transistor Technologies
- CO2 Reduction Techniques and Catalysts
- Quantum Dots Synthesis And Properties
- Electron and X-Ray Spectroscopy Techniques
- Nuclear Materials and Properties
- Advancements in Semiconductor Devices and Circuit Design
- Ga2O3 and related materials
- Molecular Junctions and Nanostructures
Forschungszentrum Jülich
2015-2025
Stadtwerke Jülich (Germany)
2010-2020
Max Planck Institute for Chemistry
2011-2012
Ernst Ruska Centre
2008-2009
Max Planck Society
2000-2004
Redox-based memristive switching has been observed in many binary transition metal oxides and related compounds. Since, on the one hand, recent reports utilize TiO(2) for their studies of phenomenon and, other there is a long history electronic structure crystallographic under impact reduction oxidation processes, we selected this material as prototypical to provide deeper insight into mechanisms behind switching. In part I, briefly outline results historical electroforming resistive...
Abstract Water splitting is an environmentally friendly strategy to produce hydrogen but limited by the oxygen evolution reaction (OER). Therefore, there urgent need develop highly efficient electrocatalysts. Here, NiFe layered double hydroxides (NiFe LDH) with tunable Ni/Fe composition exhibit corresponding dependent morphology, structure, and chemical states, leading higher activity better stability than that of conventional LDH‐based catalysts. The characterization data show low...
Eight silicate glasses were prepared by directly fusing and stirring 50‐100 g each of basalt, andesite, komatiite, peridotite, rhyolite, quartz‐diorite. These are referred to as MPI‐DING made for the purpose providing reference materials geochemical, in‐situ microanalytical work. Results from various analytical techniques indicate that individual glass fragments well homogenised with respect major trace elements at μm mm scale. Heterogeneities due quench crystallisation olivine have been...
Abstract The development of novel metal oxide catalysts for electrochemical water splitting has been one the future challenges in catalysis. We present structured spinel based NiCo 2 O 4 materials using in‐situ hydrothermal synthesis and KIT‐6 as a template. Their electron transfer kinetics oxygen evolution reaction (OER) at pH 14 are studied. Structuring via improves intrinsic catalyst performance, e. g., lower overpotential ∼350 mV good long‐term stability could be observed compared to 385...
In this work, we address the following question: Where do resistive switching processes take place in memristive thin-film devices of single crystalline model material Fe-doped SrTiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> ? We compare induced by tip atomic force microscope on bare surface with properties observed Pt top electrode. order to close gap between these two approaches, combine conductive-tip microscopy a delamination...
Recent studies indicate that small amyloid-β peptide (Aβ) oligomers are the major toxic species responsible for development and progression of Alzheimer's disease (AD). Therefore, we suggest number Aβ in body fluids is most
Abstract Formic acid is a promising hydrogen storage medium and can be produced by catalytic hydrogenation of CO 2 . Molecular ruthenium complexes immobilized on phosphine polymers have been found to exhibit excellent productivity selectivity in the under mild conditions. The polymeric analog 1,2‐bis(diphenylphosphino)ethane exhibited highest activity turnover numbers up 13 170 were obtained single run. This catalyst was already active at 40 °C with loading only 0.0006 mol %. Recycling...
The development of improved catalysts based on Co nanoparticles supported ordered mesoporous carbon CMK-3 for the highly selective hydrogenation nitroarenes is described.
Ir/terpyridine-based solid molecular catalysts facilitate efficient base-free formic acid dehydrogenation both in batch and continuous operation. A kinetic isotope effect study highlights β-hydride elimination as a rate-determining step.
Abstract Developing versatile and reliable memristive devices is crucial for advancing future memory computing architectures. The years of intensive research have still not reached demonstrated their full horizon capabilities, new concepts are essential successfully using the complete spectra functionalities industrial applications. Here, we introduce two-terminal ohmic memristor, characterized by a different type switching defined as filament conductivity change mechanism (FCM). operation...
We report Si, Ca, and Ti-V isotopic data for seven presolar silicon carbide grains of type X separated from the Murchison CM2 meteorite. The most likely formed in ejecta Type II supernova explosions as indicated by large anomalies. this study have 29Si/28Si 30Si/28Si ratios 0.56-0.75 0.41-0.62 times solar value, respectively. Slight enrichments 44Ca are observed, possibly due to decay radioactive 44Ti (t1/2 = 60 yr). While 46Ti/48Ti, 47Ti/48Ti, 50Ti/48Ti close solar, all enhanced 49Ti/48Ti...
This report presents a systematic study on the effect of zinc (Zn) carboxylate precursor structural and optical properties red light emitting InP nanocrystals (NCs). NC cores were assessed using X-ray photoelectron spectroscopy (XPS), absorption (XAS), energy-dispersive (EDX), high-resolution transmission electron microscopy (HRTEM). When moderate Zn:In ratios in reaction pot used, incorporation Zn was insufficient to change crystal structure or band gap NCs, but photoluminescence quantum...
The resistive switching behavior of devices consisting aluminum top electrode, molecular layer (rose bengal), and bottom electrode (zinc oxide indium tin oxide) is examined. By measuring the current versus voltage dependence these for various frequencies by systematically varying composition device, we show that an extrinsic effect not primarily dependent on layer. It shown short circuited filaments either zinc or due to a thin at oxide/aluminum interface.
Environmentally friendly nanocrystals (NCs) such as InP are in demand for various applications, biomedical labeling, solar cells, sensors, and light-emitting diodes (LEDs). To fulfill their potential the synthesis of high-quality "green" NCs required further improvement so to achieve better stability, higher brightness NCs, also have a more robust route. The present study addresses our efforts on In(Zn)P/ZnS core-shell using an air- moisture-stable ZnS single molecular precursor (SMP)...
Resistively switching devices are considered promising for next-generation nonvolatile random-access memories. Today, such memories fabricated by means of "top–down approaches" applying thin films sandwiched between nanoscaled electrodes. In contrast, this work presents a "bottom–up approach" disclosing the first time resistive (RS) individual TiO2 nanoparticles (NPs). The NPs, which have sizes 80 and 350 nm, respectively, obtained wet chemical synthesis thermally treated under oxidizing or...
In this work the effect of multivalency on stability NIR-absorbing HAuNSs and AuNRs functionalized by mono-, bi- tridentate polyethyleneglycol (PEG) thiol ligands is reported. Comparison commercially-available monodentate self-synthesized methoxy terminated thiol-polyethyleneglycol having molecular weights around 5000 Da shows increase for ligands, attributed to ligands. The was explored according three different aspects: (1) towards competition reactions with strong binding ligand...
Abstract Stabilization of single metal atoms is a persistent challenge in heterogeneous catalysis. Especially supported late transitions metals are prone to undergo agglomeration nanoparticles under reducing conditions. In this study, nitrogen‐rich covalent triazine frameworks (CTFs) used immobilize iridium complexes. Upon reduction at 400 °C, immobilized Ir(acac)(COD) on CTF does not form but transforms into highly active Ir atom catalyst. The resulting catalyst systems outperforms both the...
Iridium oxide is reactively sputtered onto cold and heated substrates using radio frequency (rf) as well dc plasma excitation. Oxygen integration rates into the growing film follow similar patterns for all investigated deposition conditions; differences can be explained on grounds of characteristics. X-ray photoelectron spectroscopy scanning electron microscopy show that type excitation substrate heating have little effect deposited films' chemical compositions but a remarkable their...
(Si)GeSn is an emerging group IV alloy system offering new exciting properties, with great potential for low power electronics due to the fundamental direct band gap and prospects as high mobility material. In this Article, we present a systematic study of HfO2/TaN high-k/metal gate stacks on ternary alloys temperature processes large scale integration Sn based alloys. Our investigations indicate that SiGeSn ternaries show enhanced thermal stability compared GeSn binaries, allowing use...