A5006715619- Physics of Superconductivity and Magnetism
- Photorefractive and Nonlinear Optics
- Luminescence Properties of Advanced Materials
- Crystal Structures and Properties
- Nonlinear Optical Materials Studies
- Rare-earth and actinide compounds
- Synthesis and properties of polymers
- Superconductivity in MgB2 and Alloys
- Advanced Condensed Matter Physics
- Ferroelectric and Piezoelectric Materials
- Multiferroics and related materials
- Solid-state spectroscopy and crystallography
- Copper Interconnects and Reliability
- X-ray Diffraction in Crystallography
- Photonic Crystals and Applications
- Optical properties and cooling technologies in crystalline materials
- Polyoxometalates: Synthesis and Applications
- Acoustic Wave Resonator Technologies
- Semiconductor materials and devices
- Gold and Silver Nanoparticles Synthesis and Applications
- Magnetic Properties and Synthesis of Ferrites
- Layered Double Hydroxides Synthesis and Applications
- Magnetic and transport properties of perovskites and related materials
- Plasmonic and Surface Plasmon Research
- Advanced Photocatalysis Techniques
Université Savoie Mont Blanc
2004-2024
Laboratoire de Mécanique des Sols, Structures et Matériaux
2004-2021
Science et Ingénierie des Matériaux et Procédés
2006
Laboratoire des Matériaux et du Génie Physique
2006
Centre National de la Recherche Scientifique
2006
à la diffusion de documents scientifiques niveau recherche, publiés ou non, émanant des établissements d'enseignement et recherche français étrangers, laboratoires publics privés.
Preparation from the aqueous alkoxide route of doped and co-doped lithium niobate nanocrystals with Er3+ Yb3+ ions, detailed investigations their optical properties are presented in this comprehensive work. Simultaneous emission under femtosecond laser excitation second harmonic generation (SHG) up-conversion photoluminescence (UC-PL) is studied colloidal suspensions according to lanthanide ion contents. Special attention has been paid produce phase pure constant size (∼20 nm) thus allowing...
Synthesis and characterization of anhydrous LiZn(IO3)3 powders prepared from an aqueous solution are reported. Morphological compositional analyses were carried out by using scanning electron microscopy energy-dispersive X-ray measurements. The synthesized exhibited a needle-like morphology after annealing at 400 °C. A crystal structure for the compound was proposed powder diffraction density-functional theory calculations. Rietveld refinements led to monoclinic structure, which can be...
Phase-pure, highly crystalline sub-50 nm LiNbO3 nanocrystals were prepared from a non-aqueous solvothermal process for 72 h at 230 °C and commercial precursor solution of mixed lithium niobium ethoxide in its parent alcohol. A systematic variation the reaction medium composition with addition different amounts co-solvent including butanol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol resulted formation adjustable mean size shape anisotropy, as demonstrated XRD measurements TEM imaging....
Abstract The exact molecular reaction pathway and crystallization mechanisms of LiNbO 3 nanoparticles under solvothermal conditions are derived through extensive time‐ temperature‐resolved experiments allowing to track all the transient solid species. Starting with a simple mixing Li/Nb ethoxides, water addition is used promote condensation after ligand exchange different co‐solvents including alcohols glycols variable carbon‐chain length. A nonclassical nucleation scheme first demonstrated...
Hybrid nanoparticles composed of an efficient nonlinear optical core and a gold shell can enhance tune the emission thanks to plasmonic effect. However influence incomplete shell, i.e., isolated nano-islands, is still not well studied. Here LiNbO3 (LN) 45 nm were coated with various densities nano-seeds (AuSeeds). As both LN AuSeeds bear negative surface charge, positively-charged polymer was first onto LN. The number chains per evaluated at 1210 by XPS confirmed fluorescence titration....
A reel-to reel MOCVD system has been developed for a fast and economic process to get high quality YBCO coated conductor tapes. Several oxides buffer layer sequences (based on YSZ, CeO/sub 2/, Y/sub 2/O/sub 3/...) were then grown epitaxially two kinds of tape. Effective stacking reported here are YSZ/Y/sub 3//YBCO YSZ/CeO/sub 2//YBCO, respectively, oxidized Ni RABiTS microalloys (0,1% W) SS/YSZ (IBAD) First, EBSD AFM techniques have used characterize the substrates. Superconducting films...
ABSTRACT Polymethyl methacrylate (PMMA)/Fe(IO 3 ) nanocomposite thin films are obtained by in situ particle generation microemulsions and subsequent photopolymerization of a mixture containing methyl methacrylate, trimethylolpropane triacrylate, crystallized iron iodate (Fe(IO nanorods. Hyper‐Rayleigh scattering measurements combined with X‐ray diffraction, transmission electron microscopy, dynamic light first used to probe the crystallization kinetics nanorods water‐in‐oil prepared as oil...
Nanoparticle-based drug delivery systems have the potential for increasing efficiency of chemotherapeutics by enhancing accumulation at specific target sites, thereby reducing adverse side effects and mitigating patient acquired resistance. In particular, photo-responsive nanomaterials attracted much interest due to their ability release molecular cargos on demand upon light irradiation. some settings, they can also provide complementary information optical imaging (sub)cellular scale. We...
Abstract Nanoparticles (NPs) containing a lithium niobate (LiNbO 3 ) core and gold shell are prepared using combination of seeded‐growth layer‐by‐layer approaches. The method includes first the surface charge reversal with branched polyethyleimine, second, electrostatic binding seeds, third, successive reduction steps chloride onto gold‐seeded LiNbO NPs for progressive surface‐directed growth shell. influence three synthesis parameters, namely, pH, initial density seeds covering core,...
Preparation of stable BiFeO 3 nanocrystal suspensions through a simple, low-cost precipitation technique is described. Amorphous precursors are first precipitated from metal nitrate salts in highly basic KOH solutions, and short high-temperature annealing step then performed to induce crystallization. Nanoparticles characterized by X-ray diffraction (XRD), TEM, DLS ζ -potential measurements, the synthesis conditions optimized after systematic variation concentration within range 1–12 M. The...
Synthesis and characterization of anhydrous LiZn(IO3)3 powders prepared from an aqueous solution are reported. Morphological compositional analyses were carried out by scanning electron microscopy energy dispersive X-ray measurements. The synthesized exhibit a needle-like morphology after annealing at 400°C. A crystal structure for the compound has been proposed powder diffraction density-functional theory calculations. Rietveld refinements led to monoclinic structure, which can be...
Lithium niobate nanoparticles (LN NPs) coated with a raspberry-like gold (Au) shell are synthesized herein. The strong plasmon resonance coupling between Au NPs in raspberry nanostructures is expected to modify the surface and cavity optical fields thus significantly alter second harmonic (SH) signal generated by noncentrosymmetric crystalline core of LN. Plasmonic properties core–shell first modeled using discrete-dipole approximation method. influence size filling fraction on extinction...
Superconducting Tl-1223 and Tl-2223 films have been prepared in a two steps process : deposition of Ba:Ca:Cu = 2:2:3 precursor by spray pyrolysis ex-situ thallination. Pure textured with good superconducting properties (Tc 113K Jc 0.7 MA/cm2 at 77K, 0T) obtained. Almost pure obtained when thallinated fluorinated sources.
Noncentrosymmetric Oxides In article number 2200992, Yannick Mugnier and co-workers critically review the solution-based synthesis methods for preparation of noncentrosymmetric oxide nanocrystals with perovskite non-perovskite crystalline structures. Special attention research community to detailed understanding their formation mechanisms is still needed improving resulting morphology aggregation state in future.
Thallium based superconducting thin films of TlBa2CaCu2O7 (Tl-1212), Tl2Ba2CaCu2O8 (Tl-2212) and Tl2Ba2Ca2Cu3O10 (Tl-2223) about 100-125 nm in thickness have been prepared on (001) LaAlO3 single crystal substrate using rf-sputtering deposition Ba2Ca2Cu3O7 precursor ex-situ thallination sealed quartz tube under different atmospheres (oxygen, argon nitrogen). We studied phases formation as function partial pressure Tl2O which may be adjusted by varying thallium source content TlxBa2Ca2Cu3Oz (x...