A5027292985- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Solid-state spectroscopy and crystallography
- Perovskite Materials and Applications
- Photosynthetic Processes and Mechanisms
- Silicon and Solar Cell Technologies
- Silicon Carbide Semiconductor Technologies
- Semiconductor materials and interfaces
- Metal-Organic Frameworks: Synthesis and Applications
- Ferroelectric and Piezoelectric Materials
- Electron Spin Resonance Studies
- Spectroscopy and Quantum Chemical Studies
- Semiconductor materials and devices
- Conducting polymers and applications
- Metal-Catalyzed Oxygenation Mechanisms
- Microwave Dielectric Ceramics Synthesis
- Crystallography and molecular interactions
- Semiconductor Quantum Structures and Devices
- Organometallic Complex Synthesis and Catalysis
- Particle Detector Development and Performance
- Catalysis and Oxidation Reactions
- Integrated Circuits and Semiconductor Failure Analysis
- Porphyrin and Phthalocyanine Chemistry
- GaN-based semiconductor devices and materials
- Glass properties and applications
Vilnius University
2014-2025
Rensselaer Polytechnic Institute
2018-2024
Yonsei University
2021
Polish Academy of Sciences
2021
Wrocław University of Science and Technology
2021
AGH University of Krakow
2021
Thomas Young Centre
2021
Imperial College London
2021
ETH Zurich
2015-2018
Abstract Cation engineering provides a route to control the structure and properties of hybrid halide perovskites, which has resulted in highest performance solar cells based on mixtures Cs, methylammonium, formamidinium. Here, we present multi-technique experimental theoretical study structural phase transitions, phases dipolar dynamics mixed methylammonium/dimethylammonium MA 1- x DMA PbBr 3 perovskites (0 ≤ 1). Our results demonstrate significant suppression enhanced disorder...
Grafting molecular precursors on partially dehydroxylated silica followed by a thermal treatment yields silica-supported M(III) sites for broad range of metals. They display unique properties such as high activity in olefin polymerization and alkane dehydrogenation (M = Cr) or efficient luminescence Yb Eu) essential bioimaging. Here, we interrogate the local structure surface obtained from two precursors, amides M(N(SiMe3)2)3 vs siloxides (M(OSi(OtBu)3)3·L with L (THF)2 HOSi(OtBu)3 M Cr, Yb,...
Mixing molecular cations in hybrid lead halide perovskites is a highly effective approach to enhance the stability and performance of optoelectronic devices based on these compounds. In this work, we prepare study novel mixed 3D methylammonium (MA)-ethylammonium (EA) MA
Ion-mixing is a highly effective strategy for tuning the performance and stability of photovoltaic devices based on hybrid perovskites. Despite many works concentrating A- X-site mixing effects, comprehensive study effects B-site structural dynamic properties MA-based perovskites still absent. In this work, we investigate mixed lead–tin halide MAPb1–xSnxBr3 using multitechnique experimental approach including differential scanning calorimetry, dielectric spectroscopy, nuclear quadrupole...
It is well known that disordered relaxor ferroelectrics exhibit local polar correlations. The origin of localized fields disrupt long range order for different substitution types, however, unclear. Currently, it substituents the same valence as Ti4+ at B-site barium titanate lattice produce random disruption Ti-O-Ti chains induces behavior. On other hand, investigating and behavior resulting from more complex due to simultaneous occurrence charge imbalances displacements substituent cation....
For the clean and sustainable development, sequestration of carbon dioxide (CO<sub>2</sub>) through electrocatalytic reduction to produce high-value industrial precursors, such as CO, is a promising avenue.
Mixing of molecular cations enhances the optoelectronic properties and stability hybrid lead halide perovskites. Here, we use a multitechnique approach to determine phase diagram cation dynamics mixed methylammonium-formamidinium MA1–xFAxPbBr3 (0 ≤ x 1) The calorimetric, ultrasonic, X-ray diffraction experiments show substantial suppression structural transitions stabilization cubic upon mixing. We broad-band dielectric Raman spectroscopies study MA FA in these compounds. spectroscopy...
At low temperature, methyl groups act as hindered quantum rotors exhibiting rotational tunneling, which is highly sensitive to a local group environment. Recently, we observed this effect using pulsed electron paramagnetic resonance (EPR) in two dimethylammonium-containing hybrid perovskites doped with Mn2+ ions. Here, investigate the feasibility of an alternative fast-relaxing Co2+ center study and, model compound, use dimethylammonium zinc formate [(CH3)2NH2][Zn(HCOO)3] perovskite. Our...
In this work, copper whitlockite (Cu-WH, Ca 18 Cu 2 (HPO 4 ) (PO 12 was successfully synthesized and comprehensively characterized. This material is a copper-containing analog of the well-known biomineral magnesium (Ca Mg ).
First comprehensive EPR study of Mn 2+ ion incorporation in lead halide hybrid perovskites. We use these ions as local probes to the structural and dynamic properties MAPbCl 3 .
Mixing of molecular cations in hybrid lead halide perovskites is used to effectively tune the stability and performance photovoltaic devices based on these compounds. Upon introduction bulky such as ethylenediammonium (EN), perovskite framework becomes locally broken resulting so-called hollow perovskites. Here, we use a set different experimental techniques probe structural phase transitions, cation dynamics, dielectric response methylammonium-based MA1–xENxPb1–0.7xI3–0.4x containing...
We present a pulse electron paramagnetic resonance (EPR) and electron–nuclear double (ENDOR) study of manganese-doped [(CH3)2NH2][Zn(HCOO)3] dense metal–organic framework which exhibits structural phase transition at 163 K. The echo-detected field sweep Mn2+ EPR spectrum the low-temperature is in perfect agreement with previous continuous-wave results, while disordered reveals significant transition-dependent relaxation. 1H ENDOR pattern indicates several protons vicinity ion. experimental...
Divalent complexes of vanadium were synthesized employing bulky silyl(aryl)amido ligands −N(SiiPr3)DIPP and −N(SitBu2Me)DIPP (DIPP = 2,6-iPr2C6H3). Solid-state structural characterization revealed that although the ligand supports a monomeric, bis(amido) complex vanadium, its constitutional isomer affords homoleptic in which center is sandwiched between arene rings, an unusual binding mode for arylamido ligands. Magnetometry studies indicate V[N(SiiPr3)DIPP]2 V[(η5-DIPP)N(SitBu2Me)]2 have...
Chloracidobacterium (C.) thermophilum is a microaerophilic, chlorophototrophic species in the phylum Acidobacteria that uses homodimeric type-1 reaction centers (RC) to convert light energy into chemical using (bacterio)chlorophyll ((B)Chl) cofactors. Pigment analyses show these RCs contain BChl aP, Chl aPD, and Zn2+-BChl aP' approximate ratio 7.1 : 5.4 1. However, functional roles of three different are not yet fully understood. It was recently demonstrated aPD primary electron acceptor....
Doping the well-known metal-organic framework MIL-53(Al) with vanadium(IV) ions leads to significant changes in breathing behaviour and might have repercussions on catalytic as well. To understand properties of such a doped framework, it is necessary determine where dopant are actually incorporated. Electron paramagnetic resonance (EPR) electron-nuclear double (ENDOR) applied reveal nearest environment ions. EPR spectra as-synthesised vanadium-doped MIL-53 recorded at S-, X-, Q- W-band...
Abstract The structure of paramagnetic surface species is notoriously difficult to determine. For Ti III centers related Ziegler–Natta catalysis, we demonstrate here that detailed structural information can be obtained by advanced EPR spectroscopy and DFT computations, benchmarked on molecular analogs. hyperfine sublevel correlation (HYSCORE) spectra after reaction with 13 C‐labeled ethylene provides about the coupling a proton in first coordination sphere as well significant C thereby...
Abstract We report investigation of electrical conductivity high resistivity polystyrene/carbon nanotube composites. The films consisted a thiol‐bonded network wrapped MWNTs within polystyrene matrix with mass ratios ranging from 0% to 1%. and its thermal activation energy were systematically depending on the CNT doping level. A number phenomena could be explained by presence ‘islands’ in at levels below percolation threshold. At higher CNTs an interconnected conducting is formed. results...
Multivalent ligands hold promise for enhancing avidity and selectivity to simultaneously target multimeric proteins, as well potentially modulating receptor signaling in pharmaceutical applications. Essential these manipulations are nanosized scaffolds that precisely control ligand display patterns, which can be achieved by using polyproline oligo-helix macrocyclic nanoscaffolds
Membrane proteins are integral to numerous cellular processes, yet their conformational dynamics in native environments remains difficult study. This study introduces a nanodelivery method using nanodiscs transport spin-labeled membrane into the membranes of living cells, enabling direct in-cell double electron-electron resonance (DEER) spectroscopy measurements. We investigated protein BsYetJ, incorporating spin labels at key positions monitor changes. Our findings demonstrate successful...