A5085692954- Block Copolymer Self-Assembly
- Hydrogels: synthesis, properties, applications
- Advanced Polymer Synthesis and Characterization
- Polymer Surface Interaction Studies
- Advanced Sensor and Energy Harvesting Materials
- Nuclear Physics and Applications
- Conducting polymers and applications
- Hydrocarbon exploration and reservoir analysis
- Chalcogenide Semiconductor Thin Films
- Quantum Dots Synthesis And Properties
- Polymer Nanocomposites and Properties
- Gold and Silver Nanoparticles Synthesis and Applications
- Surfactants and Colloidal Systems
- Material Dynamics and Properties
- Phase Equilibria and Thermodynamics
- Semiconductor materials and devices
- nanoparticles nucleation surface interactions
- Theoretical and Computational Physics
- Enhanced Oil Recovery Techniques
- Perovskite Materials and Applications
- Advancements in Battery Materials
- TiO2 Photocatalysis and Solar Cells
- Solidification and crystal growth phenomena
- Copper-based nanomaterials and applications
- Supercapacitor Materials and Fabrication
Technical University of Munich
2018-2025
Heinz Maier-Leibnitz Zentrum
2022-2025
Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)
2024
Institut für Technische und Angewandte Physik (Germany)
2021
Material (Belgium)
2021
Max Planck Computing and Data Facility
2021
University of Bayreuth
2017
Polymer electrodes made of poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) are used in many applications but also sensitive to humidity. We study humidity-induced changes PEDOT:PSS as monitored with situ time-of-flight neutron reflectivity (TOF-NR) measurements under high humidity conditions. The influence the solvent additive Zonyl and a post-treatment films ethylene glycol (EG) serving analyzed respect swelling ratio water uptake. Depending on applied treatment, PEDOT...
Many nanoscale biopolymer building blocks with defect-free molecular structure and exceptional mechanical properties have the potential to surpass performance of existing fossil-based materials respect barrier properties, load-bearing substrates for advanced functionalities, as well light-weight construction. Comprehension control variations macroscopic caused by humidity-driven structural changes at are imperative challenging. A long-lasting challenge is interaction water molecules causing...
The swelling and phase transition behavior upon increasing temperature of a doubly thermoresponsive diblock copolymer thin film in steps above the characteristic cloud points (CPs) blocks is studied. An upper critical solution (UCST)-type zwitterionic poly(sulfobetaine), poly(N,N-dimethyl-N-(3-methacrylamidopropyl)-ammoniopropane sulfonate) (PSPP, CPUCST = 31.5 °C), combined with lower (LCST)-type nonionic poly(N-isopropyl-/methacrylamide) (PNIPMAM, CPLCST 49.5 °C) block. Using...
Tailoring the optical and electronic properties of nanostructured polymer–metal composites demonstrates great potential for efficient fabrication modern organic devices such as flexible sensors, transistors, diodes, or photovoltaics. Self-assembled nanocomposites offer an excellent perspective creating hierarchical nanostructures on macroscopic scales by simple bottom-up processes. We investigate growth processes nanogranular silver (Ag) layers diblock copolymer thin film templates during...
The ligand exchange process is a key step in fabrications of quantum dot (QD) optoelectronic devices. In this work, on the basis grazing incidence X-ray scattering techniques, we find that with halide ions changes PbS QD superlattice from face-centered-cubic to body-centered-cubic stacking, while crystal lattice orientation also preferentially "edge-up" "corner-up". Thus, QDs' shape supposed be main factor for alignment QDs close packed solids. Moreover, tailor solids by thermal treatments...
The swelling and solvation of 100–200 nm thin films a diblock copolymer consisting short poly(methyl methacrylate) (PMMA) block long poly(N-isopropylacrylamide) (PNIPAM) are investigated in mixed water/methanol vapors. processes followed real time using spectral reflectance (SR), time-of-flight neutron reflectometry (ToF-NR), Fourier transform infrared (FT-IR) spectroscopy, applying two scattering contrast variation sequences. After hydration pure water vapor, the vapor composition (relative...
Enzyme-catalyzed controlled radical polymerization represents a powerful approach for the of wide variety water-soluble monomers. However, in such an enzyme-based system, macromolecular catalyst (i.e., enzyme) has to be separated from polymer product. Here, we present compelling separation two species, by taking out molecular domain and locating it colloidal domain, ensuring quasi-homogeneous catalysis as well easy precious biocatalysts. We report on gold nanoparticles coated with...
The humidity-induced swelling and exchange behavior of a block copolymer thin film, which consists zwitterionic poly(sulfobetaine) [poly(N,N-dimethyl-N-(3-(methacrylamido)propyl)ammoniopropanesulfonate) (PSPP)] nonionic poly(N-isopropylacrylamide) (PNIPAM) block, are investigated by time-of-flight neutron reflectometry (TOF-NR). We monitor in situ the H2O atmosphere, followed an with D2O. In reverse experiment, D2O atmosphere subsequent studied. Both, static kinetic TOF-NR measurements...
Perovskite solar cells (PSCs) have been developed as a promising photovoltaic technology because of their excellent performance. However, interfacial recombination and charge carrier transport losses at the surface greatly limit performance stability PSCs. In this work, fabrication high-quality PSCs based on methylammonium lead iodide with ambient is reported. An anionic surfactant, sodium dodecylbenzene sulfonate (SDBS), introduced to simultaneously passivate defect states stabilize cubic...
A long-range order shifting to a short-range of the QDs is found at burn-in stage solar cell.
The swelling and co-nonsolvency behaviors in pure H2O a mixed H2O/CH3OH vapor atmosphere of two different polar, water-soluble polymers thin film geometry are studied situ. Films zwitterionic poly(sulfobetaine), namely, poly[3-((2-(methacryloyloxy)ethyl)dimethylammonio) propane-1-sulfonate] (PSPE), polar nonionic polymer, poly(N-isopropylmethacrylamide) (PNIPMAM), investigated real time by spectral reflectance (SR) measurements Fourier transform infrared (FTIR) spectroscopy. Whereas PSPE is...
In this work, we show that different enzymes, such as horseradish peroxidase (HRP), glucose oxidase, laccase, and catalase, can be directly immobilized onto plasmonic gold nanoparticles (NPs) superparamagnetic iron oxide NPs simply via unspecific physical adsorption, yielding catalytically active colloidally stable NP systems. The enzyme coating on the surface is highly robust enzymatically active. colloidal stability enzymatic performance (Vmax Km) of enzyme-coated (Au@enzyme) are strongly...
The investigation of the response kinetics smart colloidal microgel films is crucial for their optimization to enable advanced applications. We study classical thermoresponsive model system N-isopropylacrylamide cross-linked with N,N'-methylenebisacrylamide. Without typically used polyelectrolyte coating substrate, thin are prepared in a single spin-coating step. Atomic force microscopy measurements reveal an extremely dense packing, resulting homogeneous compact film particles. hydration...
The orientation of block copolymer (BCP) features in thin films can be obtained by spin-coating a BCP solution on substrate surface functionalized polymer brush layer the appropriate random (RCP). Although this approach is well established, little work reporting amount and distribution residual solvent film after process available. Moreover, no information found effect trapped interface between RCP brush. In work, systems consisting poly(styrene)-b-poly(methyl methacrylate) deposited...
Abstract In times where research focuses on the use of organic polymers as a base for complex electronic applications and improving device efficiencies, degradation is still less intensively addressed in fundamental studies. Hence, advanced neutron scattering methods are applied to investigate model system electronics composed widely used conductive polymer blend poly(3,4‐ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) together with nanocellulose flexible reinforcing template...
Nanostructured Ge is considered a highly promising material for Li-ion battery applications as offers high specific capacity and diffusivity, while inherent mesoporous nanostructures can contribute resistance against fading typically induced by volume expansion in bulk films. Mesoporous GeOx/Ge/C films are synthesized using K4Ge9 Zintl clusters precursor the amphiphilic diblock copolymer polystyrene-block-polyethylene oxide templating tool. As compared to reference sample without...
Polymer–metal composite films with nanostructured metal and/or polymer interfaces show a significant perspective for optoelectronic applications, example, as sensors or in organic photovoltaics (OPVs). The components used these devices are mostly conductive polymers conjugated π-electron systems. Enhanced OPV's power conversion efficiencies sensor sensitivity can be achieved by selective deposition on into templates. In this study, we exploit time-resolved grazing-incidence X-ray scattering...
In neutron scattering on soft matter, an important concern is the control and stability of environmental conditions surrounding sample. Complex sample environment setups are often expensive to fabricate or simply not achievable by conventional workshop manufacturing. We make use state-of-the-art 3D metal-printing technology realize a for large sizes, optimized investigations thin film samples with reflectometry (NR) grazing-incidence small-angle (GISANS). With flexibility freedom design...
Spray deposition is a scalable and cost-effective technique for the fabrication of magnetic hybrid films containing diblock copolymers (DBCs) nanoparticles. However, it challenging to obtain spray-deposited anisotropic without using external fields. In present work, spray applied prepare perpendicular by controlling orientation strontium hexaferrite nanoplatelets inside ultra-high-molecular-weight DBC polystyrene-block-poly(methyl methacrylate) (PS-b-PMMA) films. During deposition, evolution...
The FlexiProb project is a joint effort of three soft matter groups at the Universities Bielefeld, Darmstadt, and Munich with scientific support from European Spallation Source (ESS), small-K advanced diffractometer (SKADI) beamline development group Jülich Centre for Neutron Science (JCNS), Heinz Maier-Leibnitz Zentrum (MLZ). Within this framework, flexible quickly interchangeable sample carrier system small-angle neutron scattering (SANS) ESS was developed. In present contribution,...
The water swelling and subsequent solvent exchange including co-nonsolvency behavior of thin films a doubly thermo-responsive diblock copolymer (DBC) are studied via spectral reflectance, time-of-flight neutron reflectometry, Fourier transform infrared spectroscopy. DBC consists zwitterionic (poly(4-((3-methacrylamidopropyl) dimethylammonio) butane-1-sulfonate)) (PSBP) block, featuring an upper critical solution temperature transition in aqueous media but being insoluble acetone, nonionic...
The water vapor-induced swelling, as well subsequent phase-transition kinetics, of thin films a diblock copolymer (DBC) loaded with different amounts the salt NaBr, is investigated in situ. In dilute aqueous solution, DBC features an orthogonally thermoresponsive behavior. It consists zwitterionic poly(sulfobetaine) block, namely, poly(4-(N-(3′-methacrylamidopropyl)-N,N-dimethylammonio) butane-1-sulfonate) (PSBP), showing upper critical solution temperature, and nonionic...