A5048233092- Advanced Photocatalysis Techniques
- Copper-based nanomaterials and applications
- Perovskite Materials and Applications
- Chalcogenide Semiconductor Thin Films
- Dielectric materials and actuators
- Ferroelectric and Piezoelectric Materials
- Solid-state spectroscopy and crystallography
- MXene and MAX Phase Materials
- Quantum Dots Synthesis And Properties
- Conducting polymers and applications
- Dielectric properties of ceramics
- Luminescence and Fluorescent Materials
- Nanomaterials for catalytic reactions
- Silicon and Solar Cell Technologies
- Nanoparticles: synthesis and applications
- Molecular Junctions and Nanostructures
- Electromagnetic wave absorption materials
- Magnetic and transport properties of perovskites and related materials
- Ga2O3 and related materials
- Polymer Nanocomposites and Properties
- Covalent Organic Framework Applications
- Mesoporous Materials and Catalysis
- Polymer Surface Interaction Studies
- Advanced Polymer Synthesis and Characterization
- Environmental Toxicology and Ecotoxicology
University of Duisburg-Essen
2017-2019
Essen University Hospital
2019
Max Planck Institute of Colloids and Interfaces
2013-2016
Max Planck Society
2014-2015
Martin Luther University Halle-Wittenberg
2013-2014
Here we report a new and simple synthetic pathway to form ordered, hollow carbon nitride structures, using cyanuric acid-melamine (CM) complex in ethanol as starting product. A detailed analysis of the optical photocatalytic properties shows that optimum structures are formed after 8 h condensation. For this condensation time, find significantly reduced fluorescence intensity lifetime, indicating formation new, nonradiative deactivation pathways, probably involving charge-transfer processes....
Carbon nitride polymers were prepared for the first time by pyrolysis of 3,5-disubstituted-1,2,4-triazole derivatives, namely, 3,5-diamino-1,2,4-triazole [1] and 3-amino-1,2,4-triazole-5-thiol [2], in bulk as well LiCl/KCl salt melts. The reaction [2] yields condensed heptazine-based polymers, while eutectics it leads to formation well-defined potassium poly(heptazine imides), according results 13C NMR XPS investigations, whose resembles that emeraldine salts polyaniline. density functional...
Hybrid perovskite solar cells have been creating considerable excitement in the photovoltaic community. However, they still rely on toxic elements, which impose severe limits their commercialization. Lead-free double hybrid perovskites form of Cs2AgBiBr6 shown to be a promising nontoxic and highly stable alternative. Nevertheless, device development is its infancy, performance affected by hysteresis. Here we realize for first time hysteresis-free mesoporous double-perovskite with no s-shape...
Herein, we report the facile synthesis of an efficient roll-like carbon nitride (C3N4) photocatalyst for hydrogen production using a supramolecular complex composed cyanuric acid, melamine, and barbituric acid as starting monomers. Optical photocatalytic investigations show, along with known red shift absorption into visible region, that insertion results in situ formation in-plane heterojuctions, which enhance charge separation process under illumination. Moreover, platinum standard...
Abstract Due to the unprecedented rapid increase of their power conversion efficiency, hybrid organic–inorganic perovskites CH 3 NH PbX (X = I, Br, Cl) can potentially revolutionize world solar cells. However, despite tremendous research activity, origin exceptionally large diffusion length photogenerated charge carriers, that is, low recombination rate, remains elusive. Using frequency and temperature‐dependent dielectric measurements across entire spectrum, it is shown constant conserves...
Principally new SnO<sub>2</sub>/carbon nitride composites featuring high surface areas and activity in HER under visible light were prepared by condensation of dicyandiamide MCl/SnCl<sub>2</sub>-containing salt melts.
MoS2/Co2O3/poly(heptazine imide) composite photocatalysts which are active in both noble-metal-free water reduction and oxidation half reactions upon irradiation with visible light were synthesized by a one-step procedure. Here, the LiCl/KCl eutectic melt was used as high-temperature solvent; 3-amino-1,2,4-triazole-5-thiol simultaneously acts carbon nitride precursor, sulfur source, reducing agent for Mo5+, while MoCl5 added metal source MoS2 nanoparticles being centers reaction. Water could...
Dyadic cobalt oxide-containing carbon nitride-based composite photocatalysts that are highly active in Rhodamine B degradation and water oxidation reactions were prepared by easy one-step thermal condensation of dicyandiamide CoCl<sub>2</sub> salt melts.
The outcome of the ionothermal condensation melamine in ZnCl<sub>2</sub>-containing salt melts can be directed to poly(triazine imides), MOF-like hybrid materials or zinc cyanamide/C<sub>3</sub>N<sub>4</sub> composites by careful selection reaction conditions.
Composite thin films of surface functionalized CaCu<sub>3</sub>Ti<sub>4</sub>O<sub>12</sub> prepared by spin-coating show a fivefold increase the relative permittivity compared to pure P(VDF-HFP) polymer.
BaTiO<sub>3</sub>–P(VDF-HFP) composite films without surface functionalization show a tenfold increase of the relative permittivity compared to pure polymer.
To prepare modified silica nanospheres for emulsion polymerization, a new agglomeration-free change of dispersion media has been developed. Nanosized spheres were synthesized by the Stöber method and directly with silane coupling agent. these particles subsequent medium was changed in two-step process from ethanol to water without agglomeration particles. The polymerization leads hemispherical single-core-structured silica–polystyrene composite thickness polymer shell can be altered varying...
Charge carriers in methylammonium lead perovskite solar cell absorbers assume a combined (hyper-) polaronic state combining classical Fröhlich polaron with micelle-like arrangement of electric dipoles formed by the ions. This "micellion" provides an extra contribution to dielectric constant which screens defects but maintains mobility polaron. is reported Doru C. Lupascu and co-workers article number 1700600. In image, structure hyperpolaron shown.
Introducing a modal system approach for the analytical perovskite thin-film trap physics evaluation. Our study confirms existing models formation in MAPI, substantiating different defect states grain boundary and bulk regions.