A5002349377- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Gas Sensing Nanomaterials and Sensors
- ZnO doping and properties
- Perovskite Materials and Applications
- Crystallography and molecular interactions
- Semiconductor materials and devices
- Advanced Photocatalysis Techniques
- Analytical Chemistry and Sensors
- Catalytic Processes in Materials Science
- Quantum Dots Synthesis And Properties
- Supercapacitor Materials and Fabrication
- Radioactive element chemistry and processing
- Advancements in Battery Materials
- Iron oxide chemistry and applications
- Nanowire Synthesis and Applications
- Electronic and Structural Properties of Oxides
- Transition Metal Oxide Nanomaterials
- Conducting polymers and applications
- Copper-based nanomaterials and applications
- Advanced Chemical Sensor Technologies
- Luminescence Properties of Advanced Materials
- Advanced Sensor and Energy Harvesting Materials
- Advanced battery technologies research
- Nanoparticle-Based Drug Delivery
University of Cologne
2016-2025
Institute of Inorganic Chemistry of the Slovak Academy of Sciences
2015-2025
Indian Institute of Technology Madras
2021-2024
Malaviya National Institute of Technology Jaipur
2024
Czech Academy of Sciences, Institute of Inorganic Chemistry
2016-2022
Fox Corporation (United States)
2019-2020
Xerox (France)
2019-2020
CBS International Business School
2020
National Research Tomsk State University
2019
Tomsk Polytechnic University
2019
We demonstrate open-circuit voltages exceeding 1.26 V for inverted planar CH3NH3PbI3 solar cells fabricated using a combination of lead acetate and PbCl2 precursors leading to smooth films large grain sizes. Surface recombination is suppressed by careful optimization the PTAA hole transport PCBM electron layers. Suppression bulk surface verified absolute photoluminescence measurements with external quantum efficiencies ∼5% in complete cells. In addition, we find exceptionally long lifetimes...
Ultrasmall superparamagnetic Fe3O4 nanoparticles (USIRONs) were synthesized by a novel, easily scalable chemical reduction of colloidal iron hydroxide under hydrothermal conditions. The average crystallite size (5.1 ± 0.5 nm) and good crystallinity the samples supported HR-TEM analysis saturation magnetization value (47 emu g–1). Vitamin C, used as reducing agent, also served capping agent in oxidized form (dehydroascorbic acid, DHAA) to impart with exceptional solubility stability water,...
Abstract Facile electron injection and extraction are two key attributes desired in transporting layers to enhance the efficiency of planar perovskite solar cells. Herein it is demonstrated that incorporation alkali metal dopants mesoporous TiO 2 can effectively modulate electronic conductivity improve charge process by counterbalancing oxygen vacancies acting as nonradiative recombination centers. Moreover, sulfate bridges (SO 4 2− ) grafted on surface K‐doped titania provide a seamless...
Uniform silver-containing metal nanostructures with strong and stable surface-enhanced Raman scattering (SERS) signals hold great promise for developing ultrasensitive probes biodetection. Nevertheless, the direct synthesis of such ready-to-use nanoprobes remains extremely challenging. Herein we report a DNA-mediated gold–silver nanomushroom interior nanogaps directly synthesized used multiplex simultaneous SERS detection various DNA RNA targets. The involved in can act as not only gap...
Metal halide perovskites are the first solution processed semiconductors that can compete in their functionality with conventional semiconductors, such as silicon. Over past several years, perovskite have reported breakthroughs various optoelectronic devices, solar cells, photodetectors, light emitting and memory so on. Until now, face challenges regarding stability, reproducibility, toxicity. In this Roadmap, we combine expertise of chemistry, physics, device engineering from leading...
Zinc oxide (ZnO) nanoparticles (NPs), which are declared as generally recognized safe by the U.S. Food and Drug Administration, is discussed in this review to reveal their beneficial characteristics when incorporated into packaging matrixes for food preservation applications. Some of major challenges conventional include microbial contamination, oxidation, moisture, gas, UV transmission food, lack mechanical strength. These factors lead poor shelf life, affect quality, cause wastage....
Abstract Every once in a while, revolutionary technological development arises, which leads to significant change the way approach research and push efforts. The appetite for new technology compels society look game‐changing materials, that can transform industry make advances. Sustainable energy production is paramount addressing climate crisis, generation storage play an important role of self‐powered microelectronic devices. 2D MXenes have emerged as promising candidates other...
Nanocrystalline yttrium aluminium garnet (YAG, Y3Al5O12) and Ce-doped YAG ceramics were synthesized by two 'soft chemistry' sol–gel processes using (i) mixtures of inorganic salts or oxides (ii) alkoxides the respective elements. In first approach metal ions, generated dissolving nitrates in acetic acid and/or water, complexed ethylene glycol to obtain precursors for pure doped samples. alkoxide route monolithic gels obtained hydrolysis condensation a compositional mixture Al, Y Ce PriOH...
Tin oxide (SnO2) nanowires of different diameters can be conveniently grown by combining the chemical influence a single-molecular precursor [Sn(OtBu)4] with vapor–liquid–solid growth. Upon illumination UV light at wavelength 370 nm, exhibit interesting photoconductance, which modulated tuning wire diameter, as demonstrated for samples possessing radial dimensions in range 50–1000 nm (see image).
Iron oxide nanotubes of 50−150 nm outer diameter and 2−20 wall thickness are prepared in ordered arrays. Atomic layer deposition (ALD) Fe2O3 from the precursor iron(III) tert-butoxide at 130−180 °C yields very smooth coverage pore walls anodic alumina templates, with growth 0.26(±0.04) Å per cycle. The reduced Fe3O4 tubes hard ferromagnets, variations dw have marked consequences on magnetic response tube For 50 diameter, = 13 yield largest coercive field (Hc > 750 Oe), whereas lower...
Dissipated power in metal oxide nanowires (rNW<45 nm) often causes important self-heating effects and as a result, undesired aging failure of the devices. Nevertheless, this effect can be used to optimize sensing conditions for detection various gaseous species, avoiding requirement external heaters. In letter, capabilities self-heated individual SnO2 toward NO2 are presented. These proof-of-concept systems exhibited responses nearly identical those obtained with integrated...
Nanometer‐sized zinc aluminate (ZnAl 2 O 4 ) particles were synthesized from heterometal alkoxides, [ZnAl (OR) 8 ], possessing an ideal cation stoichiometry for the ZnAl spinel. is formed at 400°C, which lowest temperature reported formation of monophasic . 27 Al magic‐angle spinning nuclear magnetic resonance spectroscopy revealed that possesses inverse structure <900°C, while normal spinel phase observed higher temperatures. The homogeneity in‐depth composition and Zn:Al (1:2) was...
A new Y−Fe alkoxide, [YFe(OPri)6(PriOH)]2, is used in the sol−gel process to obtain orthoferrite, YFeO3. The Y/Fe stoichiometry (1:1) and Y−O(R)−Fe chemical links single molecular precursor kinetically control formation of metastable YFeO3 which otherwise difficult prepare due easy garnet composition, Y3Fe5O12. TG/DTA analysis showed crystallization at 680 °C, was confirmed by XRD data. powders obtained were nanocrystalline (TEM) only crystalline compound present between 600 1300 °C...
Tina Buerki-Thurnherr*a, Lisong Xiaob, Liliane Dienera, Osman Arslanb, Cordula Hirscha, Xenia Maeder-Althausa, Kathrin Griederc, Bruno Wampflerc, Sanjay Mathurb, Peter Wicka & Harald F. Krugaa Empa, Swiss Federal Laboratories for Materials Testing and Technology, Laboratory Materials-Biology Interactions, Lerchenfeldstrasse, St. Gallen, Switzerlandb Institute of Inorganic Chemistry, University Cologne, Greinstrasse, Germanyc Biomaterials, Switzerland
Due to the synergic feature of individual components in hybrid (nano)biomaterials, their application regenerative medicine has drawn significant attention. Aiming address all current challenges aerogel as a potent scaffold bone tissue engineering application, we adopted novel synthesis approach synergistically improve pore size regime and mechanical strength aerogel. The three-dimensional this study been synthesized through versatile one-pot aqueous-based sol–gel hybridization/assembly...
The biological surface adsorption index (BSAI) is a novel approach to characterize energy of nanomaterials that the primary force behind nanoparticle aggregation, protein corona formation, and other complex interactions within systems. Five quantitative nanodescriptors were obtained represent forces (hydrophobicity, hydrogen bond, polarity/polarizability, lone-pair electrons) nanomaterial interaction with components. We have mapped over 16 different nanomaterials. When five-dimensional...
Surface-enhanced Raman scattering (SERS) has recently been used to design novel nanoprobes called "SERS tags" which hold great promise for the fields of biosensing and nanomedicine. More recent advances have shed new light on synthesis uniform nanostructures with interior nanogaps stable SERS enhancement. However, producing nanogap-based nanotags directly controllably strong multiplex signals as well developing a analytical platform recognize different types bioactive molecules still remain...
Harnessing solar energy for the production of clean hydrogen by photoelectrochemical water splitting represents a very attractive, but challenging approach sustainable generation. In this regard, fabrication Fe 2 O 3 –TiO photoanodes is reported, showing attractive performances [≈2.0 mA cm −2 at 1.23 V vs. reversible electrode in 1 M NaOH] under simulated one‐sun illumination. This goal, corresponding to tenfold photoactivity enhancement with respect bare , achieved atomic layer deposition...
Sodium-ion batteries (SIBs) can develop cost-effective and safe energy storage technology for substantial demands. In this work, we have developed manganese oxide (α-MnO2) nanorods SIB applications. The crystal structure, which is crucial high-performance storage, examined systematically the metal cathode. intercalation of sodium into α-MnO2 matrix was studied using theoretical density functional theory (DFT) studies. DFT studies predict Na ions' facile diffusion kinetics through MnO2...