A5022542419- Silicon Nanostructures and Photoluminescence
- Gold and Silver Nanoparticles Synthesis and Applications
- Nanowire Synthesis and Applications
- Advanced Sensor and Energy Harvesting Materials
- ZnO doping and properties
- Quantum Dots Synthesis And Properties
- Plasmonic and Surface Plasmon Research
- Thin-Film Transistor Technologies
- Graphene research and applications
- Advanced Photocatalysis Techniques
- TiO2 Photocatalysis and Solar Cells
- Neural dynamics and brain function
- Organic Electronics and Photovoltaics
- Ga2O3 and related materials
- Advanced Memory and Neural Computing
- Optical Coatings and Gratings
- Laser-Ablation Synthesis of Nanoparticles
- Magnetic and Electromagnetic Effects
- Thermal Radiation and Cooling Technologies
- Gas Sensing Nanomaterials and Sensors
- Copper-based nanomaterials and applications
- Hydrogels: synthesis, properties, applications
- Transition Metal Oxide Nanomaterials
- Advanced Semiconductor Detectors and Materials
- Silicon and Solar Cell Technologies
Leibniz Institute of Photonic Technology
2016-2025
Albert Einstein College of Medicine
2025
Friedrich Schiller University Jena
2016
Max Planck Institute for Chemical Ecology
2010
Helmholtz Institute Jena
2010
Historically, the field of plasmonics has been relying on framework classical electrodynamics, with local-response approximation material response being applied even when dealing nanoscale metallic structures. However, confinement electromagnetic radiation approaches atomic scales, mesoscopic effects are anticipated to become observable, e.g., those associated nonlocal electrodynamic surface electron gas. Here, we investigate in propagating gap plasmon modes ultrathin metal-dielectric-metal...
Abstract We have developed an efficient, low temperature, synthetic route for ZnO nanoflowers (NFs) as photoanode material. This alternative yields small flowerlike nanostructures, built from densely self-assembled tip-ended rod structures. The obtained NFs possess a large bandgap of 3.27 - 3.39 eV, enabling the generation average open current voltage 0.56 V. Additionally, they show high internal light harvesting 14.6•10 -7 A-mol -1 . growth mechanism and self-assembly were studied in detail...
Abstract In this contribution, inspired by the excellent resource management and material transport function of leaf veins, electrical metallized veins is mimicked from vein networks. By electroless copper plating on real networks with thickness only several hundred nanometre up to micrometre, certain can be converted transparent conductive electrodes an ultralow sheet resistance 100 times lower than that state-of-the-art indium tin oxide thin films, combined a broadband optical transmission...
Abstract We describe the preparation and properties of bilayers graphene‐ multi‐walled carbon nanotubes (MWCNTs) as an alternative to conventionally used platinum‐based counter electrode for dye‐sensitized solar cells (DSSC). The electrodes were prepared by a simple easy‐to‐implement double self‐assembly process. allows controlling surface roughness in layer‐by‐layer deposition. Annealing under N 2 atmosphere improves electrode's conductivity catalytic activity graphene MWCNTs reduce I 3 −...
Organic solar cells have recently experienced tremendous efficiency improvements, but their longevity is still limited by morphological degradation, among other factors. We demonstrate in this work that small amounts of amphiphilic molecules such as perylene monoimide-diamine (PMIDA-C12) admixed to the active layer can dramatically improve classical polymer (P3HT:PC60BM). While fill factors and efficiencies reference without amphiphile dropped 35 4% original values after 588 h artificial...
The design and development of particulate photocatalysts has been an attractive strategy to incorporate earth‐abundant metal ions water splitting devices. Herein, we synthesized CoFe‐Prussian blue (PB) coated ZnO origami core‐shell nanostructures (PB@ZnO) with different mass ratio PB components investigated their photocatalytic oxidation activities in the presence electron scavenger. Photocatalytic experiments reveal that integration on boosts oxygen evolution rate by a factor ~2.4 compared...
Polycrystalline, hexagonal HoMnO3 thin films sandwiched between an un-patterned Pt/Ti bottom electrode and a circularly patterned Al top reveal forming-free, polarity dependent predictable random, unipolar resistive switching with stable retention, resistance ratio high state (HRS) low (LRS) larger than 104. An equivalent circuit model is proposed to describe the memristor as three-layered capacitor structure. Based on energy band diagram of structure under applied negative positive write...
Supramolecular organization governs the structure and optoelectronic properties of organic thin films. This study shows that films based on non-fullerene acceptor Y6 can be precisely structured via assembly at air-water interface. Theoretical cross-sectional areas, Langmuir isotherms, Brewster angle microscopy reveal Y6, despite its complex structure, is sufficiently amphiphilic to form well-defined two-dimensional layers. Mechanical annealing through compression-expansion (CE) cycles...
The energies of the frontier molecular orbitals determine optoelectronic properties in organic films, which are crucial for their application, and strongly depend on morphology supramolecular structure. impact latter two electronic energy levels relies primarily nearest-neighbor interactions, difficult to study due nanoscale nature heterogeneity. Here, an automated method is presented fabricating thin films with a tailored ratio surface bulk sites controlled extension domain edges, both used...
Graphene and its derivatives have many superior electrical, thermal, mechanical, chemical, structural properties, promise for applications. One of the issues scalable applications is lack a simple, reliable method that allows deposit well-ordered monolayer using low-cost graphene flakes onto target substrates with different surface properties. Another issue adhesion deposited thin film, which has not been well investigated yet. Following our former finding double self-assembly (DSA) process...
Abstract Epicuticular waxes, which are found on the outer surface of plant cuticles, difficult to study in vivo. To monitor growth, development, and structural alterations epicuticular wax layers, coherent anti-Stokes Raman scattering (CARS) might be used. CARS, as a Raman-based technique, not only provides insight but also chemical information by imaging spatial distribution Raman-active vibrations. Here, we present comparative using CARS scanning electron microscopy characterize structure...
Abstract In this work, a double self‐assembly (DSA) process is demonstrated based on the surface interaction between graphene flakes (GFs) and surfactant molecules at water/air interface, leading to formation of stable dense monolayer (MGFs) floating water surface. The thus prepared MGFs can be easily transferred onto various substrates almost independent their wettability. During deposition both GFs excess rearrange themselves in self‐assembled way, so that optimal compression ensured....
We investigated silver-covered polymer based nanogratings as substrates for surface-enhanced Raman spectroscopy (SERS), in particular with respect to the thickness of plasmonically active silver film. In order obtain accurate geometrical input data simulation process, we inspected cross sections gratings prepared by breaking at cryogenic temperature. noticed a strong dependence results on variations structures. Measurements revealed that an increasing film top leads blue shift plasmonic...
A new approach toward the fabrication of biocompatible composites suitable for remote melting is presented. It shown that magnetite nanoparticles (MNP) can be embedded into a matrix thermoplastic dextran esters. For purpose, fatty acid esters with adjustable points in range 30-140 °C were synthesized. Esterification polysaccharide by activation as iminium chlorides guaranteed mild reaction conditions leading to high quality products confirmed FTIR- and NMR spectroscopy well gel permeation...
Layers of aligned dyes are key to photo-driven charge separation in dye sensitized solar cells, but cannot be exploited as rectifying membranes photocatalysis separate half-cells because they not sufficiently stable. While impressive work on the fabrication stable noncovalent has been recently demonstrated, these inherently suffering from non-uniform orientation constituting dyes. To stabilize layers made uniformly assembled and dyes, can covalently cross-linked via functional groups or...
Abstract A conductive polymer (poly( p -phenylenevinylene), PPV ) was covalently modified with Ru II complexes to develop an all-polymer photocathode as a conceptual alternative dye-sensitized NiO, which is the current state-of-the-art in solar fuels research. Photocathodes require efficient light-induced charge-transfer processes and we investigated these within our photocathodes using spectroscopic spectro-electrochemical techniques. Ultrafast hole-injection dynamics were by transient...