A5040735351- Quantum Dots Synthesis And Properties
- Advanced Photocatalysis Techniques
- Gold and Silver Nanoparticles Synthesis and Applications
- Spectroscopy and Quantum Chemical Studies
- Perovskite Materials and Applications
- Plasmonic and Surface Plasmon Research
- Chalcogenide Semiconductor Thin Films
- Ga2O3 and related materials
- ZnO doping and properties
- Nonlinear Optical Materials Studies
- German Economic Analysis & Policies
- Advanced Semiconductor Detectors and Materials
- Strong Light-Matter Interactions
- Quantum Information and Cryptography
- Fullerene Chemistry and Applications
- Technology Assessment and Management
- Laser Material Processing Techniques
- Crystallography and Radiation Phenomena
- Economic and Business Studies
- Metamaterials and Metasurfaces Applications
- Antenna Design and Analysis
- Aluminum Alloys Composites Properties
- Antenna Design and Optimization
- Covalent Organic Framework Applications
- Additive Manufacturing Materials and Processes
University of Mannheim
2023
Centre de Nanosciences et de Nanotechnologies
2022
Centre National de la Recherche Scientifique
2021-2022
Université de Technologie de Troyes
2021-2022
Ludwig-Maximilians-Universität München
2014-2017
Center for NanoScience
2014-2017
Nanosystems Initiative Munich
2015-2017
AIM Infrarot-Module (Germany)
2000-2002
Max Planck Society
1992
Stanford University
1986
The primary amine groups on the heptazine‐based polymer melon, also known as graphitic carbon nitride (g‐C 3 N 4 ), can be replaced by urea using a two‐step postsynthetic functionalization. Under simulated sunlight and optimum Pt loading, this urea‐functionalized has one of highest activities among organic polymeric photocatalysts for hydrogen evolution with methanol sacrificial donor, reaching an apparent quantum efficiency 18% nearly 30 times rate compared to nonfunctionalized counterpart....
Copper(I)-based catalysts, such as Cu2S, are considered to be very promising materials for photocatalytic CO2 reduction. A common synthesis route Cu2S via cation exchange from CdS nanocrystals requires Cu(I) precursors, organic solvents, and neutral atmosphere, but these conditions not compatible with in situ applications photocatalysis. Here we propose a novel reaction that takes advantage of the reducing potential photoexcited electrons conduction band proceeds Cu(II) precursors an aqueous...
Cadmium chalcogenide nanocrystals combined with co-catalyst nanoparticles hold promise for efficient solar to hydrogen conversion. Despite the progress, achieving high efficiency is hampered by charge recombination rates and sample degradation. Here, we vary decoration of platinum on CdS nanorods demonstrate important role pathways photoelectrons co-catalyst. Contrary expectations, shortening path, increasing number particles, increases transfer rate but decreases photocatalytic performance....
Perovskite nanocrystals have emerged as an interesting material for light-emitting and other optoelectronic applications. Excitons are known to play important role in determining the optical properties of these their energetic levels well quantization been extensively explored. Despite this, there still many aspects perovskites that not well-known, example, homogeneous inhomogeneous line widths transitions, quantities cannot be directly extracted by linear absorption spectroscopy on...
The crucial separation of photocarriers in solar cells can be efficiently driven by contacting semiconductor phases with differing doping levels. Here we show that intrinsic surges methylammonium lead iodide (MAPbI3) crystals as a response to environmental basicity. MAPbI3 were passivated polybases induce the deprotonation its ions (MA+). Stable showed marked increases photoluminescence and radiative decay, attributed presence unbalanced charges acting doped carriers. This emulates...
Strong coupling of plasmons and excitons can form hybrid states, the so-called "plexcitons". Although have a low quality factor, exceptionally high strength with molecular aggregates, in particular J-aggregates, allows realization strong interaction. Despite several studies recent years showing formation plexcitonic their nature, especially at very short times, is still insufficiently investigated. In this article, we identify nonlinear optical behavior plexcitons formed on gold nanorods...
Five grams of a mixture C 60 /C 70 can be separated in 24 hours by gel permeation chromatography on polystyrene gel. The mobile phase completely recovered, and the method scaled up simple increase inner diameter column.
Significance Optical antennas perform the same functions for light that aerials do radio waves; they can extract energy from a propagating electromagnetic field, and convert localized into radiation. Here, we use fractal-like design, Cayley tree, to create optical antennas. Implementing this simple iterative design with aluminum as antenna material, demonstrate broadband operating range energies corresponding thermal radiation up ultraviolet. The spatial distribution of inside is...
Fünf Gramm einer C 60 /C 70 ‐Mischung können innerhalb von 24 Stunden durch Gelpermeationschromatographie an Polystyrol‐Gel getrennt werden. Die mobile Phase kann vollständig zurückgewonnen werden, und eine Übertragung dieser Methode auf größere Maßstäbe ist simple Vergrößerung des Säuleninnendurchmessers möglich.
Abstract CdSe/CdS core-shell nanocrystals with controlled CdS shell thickness and CdSe core size were synthesized for several different values of these two parameters. The particles in aqueous dispersion situ decorated Ni nanoparticles evaluated photocatalytic hydrogen generation capacity. highest H 2 production quantum yield at 457 nm illumination was 4.7%, while 530 it rose to 9.1%. We have found that ensuring equal absorption wavelength the formation rate increases thickness, but...
Metallic nanostructures acting as optical nanoantennas can significantly enhance the photoluminescence (PL) of nearby emitters. Albeit luminescence enhancement factors several orders magnitude have been reported for quantum dots or molecules, in case bulk emitters, plasmonic is strongly hindered by weak spatial overlap between active medium and electromagnetic modes nanoantenna. Here, we propose a solid-state ultraviolet emitter based on thin film zinc oxide (ZnO) coupled with an array...
To meet the demands for high performance HgCdTe detectors at yield and producibility, key processes have been optimized new approaches developed. By a superior CdZnTe Bridgman growth process, dislocation densities <1x10<SUP>5</SUP>cm<SUP>-2</SUP> in substrate epitaxial layer are achieved all substrates, ensuring Focal-Plane-Arrays, particularly (lambda) <SUB>CO</SUB>=11,5 micrometers arrays. A guard ring approach planar diodes, created by n<SUP>+</SUP>-region pixel spacing area reduces...
We report our recent results of investigation the interactions between localized plasmons in gold nanorods and excitons J-aggregates. were able to track an anticrossing behavior hybridized modes both extinction photoluminescence spectra this hybrid system. identified nonlinear optical system by transient absorption spectroscopy. Finally using magnetic circular dichroism spectroscopy, we show that nonmagnetic organic molecules exhibit magneto-optical response due binding a plasmonic...
To meet the demands for high temperature-cycling reliability of HgCdTe detectors, bonded to a Silicon 'Read-Out-Integrated- Circuit,' AIM has developed Multi-Chip-Module approach infrared Focal-Plane-Array. Bonding detector array and Si-chips on sapphire substrate minimizes thermal stress strain in FPA, leading cycle-to-failure >= 1000. For maximum cycle estimation under varying strain, correlation was established empirically.
Strong coupling of plasmons and excitons can form hybrid states, the so called "plexcitons". Especially with molecular J-aggregated dye molecules strong interaction becomes observable even under ambient conditions. In our work we investigate nature plexcitonic states formed in gold nanorods coated a cyanine by transient absorption spectroscopy. We demonstrate that plexcitons show tunable plasmonic excitonic non-linear optical behaviour. Our experimental data be explained on basis simple...
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We investigated the interactions between localized plasmons in gold nanorods and excitons J-aggregates were able to track an anticrossing behavior of hybridized modes both extinction photoluminescence spectra this hybrid system. identified nonlinear optical system by transient absorption spectroscopy. Finally using magnetic circular dichroism spectroscopy we showed that nonmagnetic organic molecules exhibit magnetooptical response due binding a plasmonic nanoparticles. In our experiments...
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