A5013316238- Advanced Condensed Matter Physics
- Magnetic and transport properties of perovskites and related materials
- Perovskite Materials and Applications
- Magnetism in coordination complexes
- Lanthanide and Transition Metal Complexes
- Luminescence and Fluorescent Materials
- Luminescence Properties of Advanced Materials
- Electronic and Structural Properties of Oxides
- Multiferroics and related materials
- Catalysis and Oxidation Reactions
- X-ray Diffraction in Crystallography
- Catalytic Processes in Materials Science
- Physics of Superconductivity and Magnetism
- Crystallization and Solubility Studies
- Rare-earth and actinide compounds
- Polyoxometalates: Synthesis and Applications
- Magnetic Properties and Synthesis of Ferrites
- Advanced ceramic materials synthesis
- TiO2 Photocatalysis and Solar Cells
- Inorganic and Organometallic Chemistry
- Metal complexes synthesis and properties
- Advanced Photocatalysis Techniques
- Solid State Laser Technologies
- Transition Metal Oxide Nanomaterials
- Endodontics and Root Canal Treatments
Institut de Physique et Chimie des Matériaux de Strasbourg
2012-2025
Université de Strasbourg
2011-2025
Centre National de la Recherche Scientifique
2013-2025
Laboratoire Léon Brillouin
2017
CEA Paris-Saclay
2017
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2017
An opto-electronic switching device made from an evaporated spin crossover thin film over a graphene sensor is presented. The electrical transduction of both temperature and light-induced reversible transitions are demonstrated.
Upconversion materials have led to various breakthrough applications in solar energy conversion, imaging, and biomedicine. One key impediment is the facilitation of such processes at molecular scale solution where quenching effects are much more pronounced. In this work, solution-state cooperative luminescence (CL) upconversion arising from a Yb excited state explored mechanistic origin behind sensitisation (CS) Yb/Tb systems investigated. Counterintuitively, best UC performances were...
We have prepared a hetero-tetrametallic assembly consisting of three ytterbium ions coordinated to central [Ru(bpm)3]2+ (bpm = 2,2′-bipyrimidine) motif. Irradiation into the absorption band peripheral at 980 nm engenders emission 3MLCT state core 636 nm, which represents first example f → d molecular upconversion (UC). Time-resolved measurements reveal slow rise UC emission, was modeled with mathematical treatment observed kinetics according cooperative photosensitization mechanism using...
In this work, we analyze the magnetic properties of low-dimensional CoV2O6 powders showing monoclinic (α) and triclinic (γ) crystalline structures. The two phases are constituted parallel 1D Co chains organized in planes that separated by vanadium oxide thin layers. Both α γ antiferromagnetic ground state with Néel temperatures 15 7 K, respectively. magnetization curves recorded at 5 (α phase) 1.8 K (γ show a stepped variation sharp field-induced transitions plateau one-third saturation...
Upconversion nanoparticles are a promising class of materials for bioimaging. Their attractive optical properties influenced by their crystalline phase, size, and morphology resulting from the preparation method employed. Herein, we synthesized NaYF4:Yb,Er nanocrystals coprecipitation followed heat treatment step. The influence temperature type reactor on phase transition α-cubic to β-hexagonal was investigated. We found that before transition, size shape α-NaYF4:Yb,Er evolved due...
Abstract The recent discovery of a zero-resistance state in nickel-based compounds has generated re-excitement about the long-standing problem condensed matter high-critical temperature superconductivity, light similarities between infinite-layer nickelates and cuprates. However, despite some formal valence crystal symmetry analogies, electronic properties are remarkably original accounting, among other properties, unique Nd 5d-Ni 3d hybridization. This designates as new class oxide...
The photocatalytic performance of Nb,N-codoped TiO2 nanoparticles obtained via the sol–gel method was compared to that N-doped TiO2. study focused on investigating effects nitridation conditions nitrogen insertion with a highlight nature doping sites in photocatalyst depending initial presence niobium photodegradation methylene blue solution under UV, visible, and simulated solar light used evaluate activity TiO2, Nb- or nanoparticles. Codoped produced by mild thermal exhibits best activity,...
In this work, we investigate the magnetic properties of monoclinic $\ensuremath{\alpha}$-CoV${}_{2}$O${}_{6}$ by powder neutron diffraction measurements and ab initio calculations. An emphasis has been pointed towards structure interaction between Co ions leading to frustrations in compound. Neutron experiments were carried out both ground state (zero field) under applied external field 2.5 5 T corresponding ferrimagnetic ferromagnetic states, respectively. The antiferromagnetic below 14 K...
Abstract This study explores the morphological and structural transformation of boehmite (AlOOH) into transition aluminas during calcination, a pathway crucial for diverse industrial applications. The primary focus is on topotactic γ‐Al 2 O 3 its subsequent transitions higher temperature polymorphs, culminating in α‐Al . Utilizing combination situ X‐ray diffraction, ex transmission electron microscopy, 27 Al solid‐state nuclear magnetic resonance, thermogravimetric analysis, nitrogen...
Lead halide perovskites (LHPs) have emerged as promising candidates for a broad range of optoelectronic devices because their unique physical properties. Methylammonium lead iodide (MAPI) perovskite has been the most commonly studied LHP due to its very One main explored pathways obtaining MAPI is synthesis by ligand-assisted reprecipitation (LARP); however, this method not totally understood from phenomenological point view. In study, we took advantage development series advanced in situ...
The structural and magnetic properties of γ-CoV2O6 low-dimensional oxide have been investigated with an emphasis on its structure. Our main results obtained by powder neutron diffraction measurements carried out under fields 0, 0.52, 1 T, corresponding to the antiferromagnetic, ferrimagnetic, ferromagnetic configurations moments. moments are not collinear, but lie mostly along b direction (i.e., inside edge-sharing CoO6 chains), which corresponds experimental easy magnetization axis. In...
Room temperature magnetoelectric multiferroic thin films offer great promises for the spintronics industry. The actual development of devices, however, requires production ultrathin atomically smooth high crystalline quality in order to increase spin transfer efficiency. Using both high-resolution transmission electron microscopy and resolved energy loss spectroscopy, we unveil complex growth mechanism a promising candidate, gallium ferrite. This material, with its net room-temperature...
Abstract We evidence the ferroelectricity of two isostructural magnetic coordination networks obtained from a chiral imidazolium dicarboxylate salt ((S, S)‐1,3‐bis(1‐carboxylethyl)imidazolium or [HL*]) and Gd 3+ Dy ions in presence oxalic acid (H 2 ox). The compounds exhibit structure P 1 ferroelectric properties. crystallographic study shows that based‐compound is to analog. non‐centrosymmetry samples was further checked by means nonlinear optical spectroscopy. room temperature character...
We report on the epitaxial growth of 100 nm thick triclinic γ-CoV2O6 thin films deposited by pulsed laser deposition TiO2(100) substrate. The layers were grown in narrow experimental conditions, at 600 °C and 0.1 millibar oxygen pressure. X-ray diffraction transmission electron microscopy evidenced presence two variants following relation between substrate: [001]TiO2(100)∥[0±10]γ-CoV2O6(100). Besides magnetization steps expected γ-CoV2O6, low temperature magnetic measurements performed along...
In this publication, we report on the study of magnetic anisotropy cubane type tetranuclear cluster Ni(II), [Ni4(L)4(MeOH)4] (H2L = salicylidene-2-ethanolamine; MeOH methanol), by means angular-resolved magnetometry and polarized neutron diffraction (PND). We show that better than other usual characterization techniques—such as electron paramagnetic resonance spectroscopy (EPR) or SQUID magnetometry—only PND enables full determination local susceptibility tensor those individual Ni(II) ions...
Abstract Upconversion materials have led to various breakthrough applications in solar energy conversion, imaging, and biomedicine. One key impediment is the facilitation of such processes at molecular scale solution where quenching effects are much more pronounced. In this work, solution‐state cooperative luminescence (CL) upconversion arising from a Yb excited state explored mechanistic origin behind sensitisation (CS) Yb/Tb systems investigated. Counterintuitively, best UC performances...
In search of new multifunctional hybrid materials and in order to investigate the influence chemical modification on possible synergy between properties, carboxylate sulfonate derivatives photo- thermochromic N-salicylidene aniline were successfully inserted into Co(II)- Zn(II)-based layered simple hydroxides, resulting four novel hybrids: Co-N-Sali-COO, Co-N-Sali-SO3, Zn-N-Sali-COO, Zn-N-Sali-SO3. All synthesized hybrids adopt a double organic configuration, which prevents cis-trans...
Schiff base ligand (4-methyl-1-(1-(pyridin-2-yl)ethylidene)thiosemicarbazide (H2L) was synthesized via condensation of 2-acetylpyridine and 4-methyl-3-thiosemicarbazide in ethanol. The Zn(II) complex obtained from 2:1 (H2L/Zn(OAc)2.2H2O) molar ratio reaction, yielding a neutral compound formulated as [Zn(HL)2]. Elemental analysis, 1H 13C NMR, conductance measurements FT-IR spectroscopy were used for the characterization complex. is non-electrolyte DMF solution. structure determined by single...