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3 results on '"Sylvain Regny"'

1. Evidence of reaction intermediates in microwave-assisted synthesis of SHG active α-La(IO3)3nanocrystals

Author

Sylvain Regny, Isabelle Gautier-Luneau, Géraldine Dantelle, Yan Suffren, Olivier Leynaud, Optique et Matériaux (OPTIMA), Institut Néel (NEEL), Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Institut des Sciences Chimiques de Rennes (ISCR), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), X'Press (X'Press), Optique et Matériaux (NEEL - OPTIMA), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), and X'Press : diffraction et hautes pressions (NEEL - X'Press)

Subjects
Materials science, Coordination sphere, chemistry.chemical_element, [CHIM.MATE]Chemical Sciences/Material chemistry, 02 engineering and technology, General Chemistry, Reaction intermediate, 010402 general chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 7. Clean energy, 01 natural sciences, Hydrothermal circulation, 0104 chemical sciences, chemistry.chemical_compound, Crystallography, chemistry, Phase (matter), Lanthanum, Hydrothermal synthesis, General Materials Science, 0210 nano-technology, Hydrate, Iodate
Abstract

International audience; We explore here how, under microwave assisted hydrothermal process, various synthesis conditions influence the formation of different lanthanum iodate compounds: α-La(IO3)3, La(IO3)3(H2O), La(IO3)3(HIO3) and La(IO3)2.66(OH)0.66. Whatever the intial [La 3+ ]:[IO3-] ratio, α-La(IO3)3 crystallizes if the synthesis temperature exceeds 220°C. Phase transformations in solid state or under hydrothermal synthesis are also discussed. Interestingly, we evidence the full phase transformation under hydrothermal synthesis from the new hydrate form La(IO3)3(H2O) into stable and optically active α-La(IO3)3 through an appropriate hydrothermal process. This evolution can be explained by structural rearrangements of the coordination sphere of lanthanum atoms, stabilizing the structure.

Published
2020
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2. Microwave Synthesis and Up-Conversion Properties of SHG-Active α-(La, Er)(IO3)3 Nanocrystals

Author

Isabelle Gautier-Luneau, Géraldine Dantelle, Sylvain Regny, Yannick Mugnier, Sébastien Pairis, Stéphanie Kodjikian, Ronan Le Dantec, Jérémy Riporto, Laboratoire SYstèmes et Matériaux pour la MEcatronique (SYMME), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]), Optique et microscopies (POM), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), and Optique et Matériaux (OPTIMA )

Subjects
Photoluminescence, Scattering, Analytical chemistry, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 7. Clean energy, Hydrothermal circulation, [SPI.MAT]Engineering Sciences [physics]/Materials, 0104 chemical sciences, law.invention, Inorganic Chemistry, chemistry.chemical_compound, chemistry, Nanocrystal, Dynamic light scattering, law, Physical and Theoretical Chemistry, Electron microscope, 0210 nano-technology, Ethylene glycol, ComputingMilieux_MISCELLANEOUS, Microwave
Abstract

Pure α-La(IO3)3 and α-La0.85Er0.15(IO3)3 nanocrystals were synthesized by a microwave-assisted hydrothermal method leading to a reaction yield of 87 ± 4%. Electron microscopy and dynamic light scattering characterizations provide evidence for the formation of nanocrystals with an average size of 45 ± 10 nm for α-La(IO3)3 and 55 ± 10 nm for α-La0.85Er0.15(IO3)3. When dispersed in ethylene glycol, the nanocrystal suspensions exhibit second-harmonic generation under near-infrared excitations at 800 and 980 nm whereas additional photoluminescence by up-conversion is simultaneously observed in the case of α-La0.85Er0.15(IO3)3 nanocrystals. Quantitative assessments of the second-harmonic generation efficiency from second-harmonic scattering experiments at 1064 nm result in relatively high ⟨ d⟩ coefficients measured at 8.2 ± 2.0 and 8.0 ± 2.0 pm V-1 for α-La(IO3)3 and α-La0.85Er0.15(IO3)3, respectively. The relative intensity between second-harmonic generation and photoluminescence is discussed following the excitation wavelength.

Published
2019
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