A5021066964- 2D Materials and Applications
- X-ray Diffraction in Crystallography
- Chalcogenide Semiconductor Thin Films
- Crystallization and Solubility Studies
- Lanthanide and Transition Metal Complexes
- MXene and MAX Phase Materials
- Artificial Intelligence in Healthcare
- Quantum Dots Synthesis And Properties
- Magnetism in coordination complexes
- ZnO doping and properties
- Organic Electronics and Photovoltaics
- Photochemistry and Electron Transfer Studies
- Graphene research and applications
- Electron Spin Resonance Studies
- Perovskite Materials and Applications
- Chemical Synthesis and Analysis
- Radioactive element chemistry and processing
- Semiconductor materials and devices
- Advanced biosensing and bioanalysis techniques
- Organometallic Complex Synthesis and Catalysis
- Advanced Photocatalysis Techniques
- RNA and protein synthesis mechanisms
- Organic Light-Emitting Diodes Research
- Analytical chemistry methods development
- Origins and Evolution of Life
Sofia University "St. Kliment Ohridski"
2003-2024
Bulgarian Academy of Sciences
2008-2024
Institute of Optical Materials and Technologies Jordan Malinowski
2022
Université de Strasbourg
2012-2014
Centre National de la Recherche Scientifique
2003-2013
Institute of Polymers
2008
Institut Charles Sadron
2003
Institut de Physique et Chimie des Matériaux de Strasbourg
2003
Two members of the tetradentate N-donor ligand families 6,6'-bis(1,2,4-triazin-3-yl)-2,2'-bipyridine (BTBP) and 2,9-bis(1,2,4-triazin-3-yl)-1,10-phenanthroline (BTPhen) currently being developed for separating actinides from lanthanides have been studied. It has confirmed that CyMe4-BTPhen 2 faster complexation kinetics than CyMe4-BTBP 1. The values HOMO-LUMO gap are comparable with those 1 which was previously calculated to be 2.13 eV. displacement BTBP its bis-lanthanum(III) complex by...
A series of bis-iminonitroxide diradical derivatives different lengths and geometry have been prepared that incorporate a conjugated phenylene-ethynylene bridge as rigid spacer. This paper describes the synthesis these new components their main characterizations. An unexpected singlet ground state substituent effects on singlet-triplet gap found for substituted "m-phenylene"-based diradicals. The pi-conjugation intramolecular through-bond spin coupling investigated by changing length spacer...
Abstract The synthesis of high-quality two-dimensional molybdenum disulfide (MoS 2 ) is a crucial step for achieving novel applications in nanoelectronics and optoelectronics. This study introduces c-cut sapphire pre-treatment strategy using sodium sulfide (Na S) to enhance MoS growth. In this method, the substrate dipped × 10 −2 M deionized water solution Na S, which facilitates release hydrogen (H through reaction with atmospheric moisture. H S generated situ acts as an effective catalyst...
The quadridentate N-heterocyclic ligand 6-(5,5,8,8-tetramethyl-5,6,7,8-tetrahydro-1,2,4-benzotriazin-3-yl)-2,2′ : 6′,2′′-terpyridine (CyMe4-hemi-BTBP) has been synthesized and its interactions with Am(III), U(VI), Ln(III) some transition metal cations have evaluated by X-ray crystallographic analysis, Am(III)/Eu(III) solvent extraction experiments, UV absorption spectrophotometry, NMR studies ESI-MS. Structures of 1 complexes Eu(III), Ce(III) the linear uranyl (UO22+) ion were obtained they...
Owing to their exceptional properties, which are usually determined by the growth conditions, 2D transition metal dichalcogenides (TMDCs) offer numerous research directions for applications in fields of spintronics, valleytronics, and optoelectronics. Here, we focus on chemical vapor deposition (CVD) synthesis WSe2 (tungsten diselenide) nanoclusters/nanoflakes using a liquid precursor tungsten (ammonium metatungstate) Si/SiO2, fused silica, sapphire substrates. Various clusters with...
We have investigated the doping mechanism of pentacene with iodine and its impact on structure electronic properties single crystals, powders, thin films in a large range concentration up to six per (PEN) molecule (I/PEN = 6). Three regimes been identified. In low regime I/PEN < 0.05, pristine crystals is maintained. Electron spin resonance (ESR) evidences Pauli susceptibility, that is, characteristic fingerprint delocalized holes valence band pentacene. intermediate (0.1 ≤ 2.0), diffuses...
We report a two-step growth process of MoS
PtSe
In this paper, aluminum-doped zinc oxide (ZnO:Al or AZO) thin films are grown using atomic layer deposition (ALD) and the influence of postdeposition UV-ozone thermal annealing treatments on films' properties investigated. X-ray diffraction (XRD) revealed a polycrystalline wurtzite structure with preferable (100) orientation. The crystal size increase after is observed while exposure led to no significant change in crystallinity. results photoelectron spectroscopy (XPS) analyses show that...
Abstract In this work, we present a study on the epitaxial growth of MoS 2 both sapphire and mica substrates using Chemical Vapor Deposition (CVD) method. The research focuses optimizing conditions in order to achieve reproducible results explore potential conventional Van der Waals epitaxy for synthesizing nanolayers nanoclusters transition metal dichalcogenides. By carefully selecting appropriately oriented performing targeted surface modification, successfully achieved desired growth....
Abstract A series of complexes M II X 2 transition metal salts (X = ClO 4 , Co, Ni, Cu, Zn; Cl, Zn) with a calix[4]arene substituted at the lower rim {L 5,11,17,23‐tetra‐ tert ‐butyl‐25,26,27,28‐tetrakis[(dimethylphosphinoyl)methoxy]calix[4]arene} are isolated and characterized. Two different stoichiometries evidenced, 1:1 for Co Ni Cu complexes, independently anion (Cl − or ), as well Zn(ClO ) complex, while 2:1 metal/ligand ratio is found complex ZnCl . The coordination mode structure...
Computational modeling of the optical characteristics organic molecules with potential for thermally activated delayed fluorescence (TADF) may assist markedly development more efficient emitting materials light-emitting diodes. Recent theoretical studies in this area employ mostly methods from density functional theory (DFT). In order to obtain accurate predictions within approach, choice a proper is crucial. current study, we focus on testing performance set DFT functionals estimation...
Four benzothiazolium crown ether-containing styryl dyes were prepared through an optimized synthetic procedure. Two of the (4b and 4d) having substituents in 5-position benzothiazole ring are newly synthesized compounds. They demonstrated a higher degree trans-cis photoisomerization longer life time energy forms comparison with known analogs. The chemical structures all series characterized by NMR, UV-vis, IR spectroscopy elemental analysis. steady-state photophysical properties elucidated....
Abstract A method for the synthesis of Gly, Ala, Phe, and Thr esters is proposed considered as being a stage possible biomimetic peptides. The methyl said amino acids are obtained via intervention 2‐hydroxypropyl phosphonate. resulting aminoacyl phosphonates reacts with methanol to produce acid esters, release phosphoric acid. reaction carried out at room temperature in water. © 2008 Wiley Periodicals, Inc. Heteroatom Chem 19:252–255, 2008; Published online InterScience (...
We report the synthesis of tungsten diselenide (WSe2) flakes and continuous layers using an atmospheric pressure thermally assisted conversion (TAC) method, where (W) were pre-deposited by a magnetron sputtering system onto fused silica substrates. Optical microscopy (OM) atomic force (AFM) mapping predominantly revealed formation isolated with different shapes, mainly concentrated near substrate’s edges, which tended to form clusters further overlap layers, moving central part Raman...
Abstract The results of a successful synthesis WSe 2 /PtSe heterostructures are presented. High quality crystalline films were achieved through one–step selenization pre-deposited tungsten film with platinum as an underlayer. role the PtSe layer, formed during selenization, was to assists growth WSe2. existence WSe2 confirmed using Raman spectroscopy and X-ray photoelectron (XPS). crystallinity samples investigated diffraction (XRD). Surface measurements performed atomic force microscopy (AFM).
Here, we demonstrate the implementation of transparent conductive aluminum-doped zinc oxide (AZO) thin films deposited on glass substrate (AZO/glass) by atomic layer deposition technique in liquid crystal (LC) spatial light modulator (SLM) devices. Structural, optical, and electrical properties as well surface free energy reveal high quality uniformity AZO layers. We present two types structures that highlight multifunctional role SLM configurations: (i) a for assembling regular antiparallel...
Titanium dioxide thin coatings are widely used in different fields for the manufacture of various products:electrochromic displays, photocatalytic systems, photosensitized solar cells and many others. At same time, possibilities obtaining protective based on TiO2 interest. The chemical physical characteristics depend a large extent applied technological method temperature values heat treatment used. Coatings prepared by sol gel applying dip coating technique. present study characterizes...