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Mishra S. - One of the best experts on this subject based on the ideXlab platform.
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Designing molecular precursors for inorganic nanomaterials
HAL CCSD, 2019Co-Authors: Mishra S.Abstract:SSCI-VIDE+CDFA+SMRInternational audienceIndustrial development of chemical solution and vapor routes such as Sol-gel, MOD or MOCVD methods to inorganic nanomaterials is strongly dependent on the molecular engineering that involves design of tunable Metal-organic precursors. These molecular precursors are usually the starting point of the processes and influence the micro- & nano-structure and, therefore, the nature and the properties of the obtained materials.1 The use of well-defined precursors also allows to establish relationships between the precursors and the final material and, therefore, to get some insight in to their transformation. This presentation will address different concepts of the ‘bottom-up’ approach with a special emphasis on the design of homo or heteroMetallic (‘single-source’) precursors which have (i) a formulation that matches well with that of the final materials, particularly stoichiometry between Metals for multiMetallic materials, (ii) appropriate physicochemical properties (solubility, thermal stability, volatility…), (iii) the required chemical functionalities (coordination sphere with an appropriate set of ligands), and (iv) a clean, low temperature conversion into materials with minimized undesired residues in the end.2,3 Catalytic applications of the obtained nanomaterials, especially in the field of photocatalysis, will be described. Keywords: molecular precursor, nanomaterials, Sol-Gel, Metal-organic decomposition, Metal Oxide, Metal selenide nanoparticles, Metal fluoride composites, photocatalysisREFERENCES [1] S. Mishra, S. Daniele, Metal-organic derivatives with fluorinated ligands as precursors for inorganic nanomaterials, Chem. Rev. 2015, 115, 8379-8448.[2] a) S. Mishra, F. Morfin, V. Mendez, P. N. Swamy, J.-L. Rousset, S. Daniele, Nanometric NaYF4 as an unconventional support for Gold catalysts for oxidation reactions, ACS Omega, 2019, 4, 5852−5861; b) S. Mishra, E. Jeanneau, S. Mangematin, H. Chermette, M. Poor Kalhor, G. Bonnefont, G. Fantozzi, S. Le Floch, S. Pailhese, S. Daniele, A convenient and quantitative route to Sn(IV)–M [M = Ti(IV), Nb(V), Ta(V)] heterobiMetallic precursors for dense mixed-Metal Oxide Ceramics, Dalton Trans., 2015, 44, 6848–6862; c) Y. Chen, S. Mishra, G. Ledoux, E. Jeanneau, M. Daniel, J. Zhang, S. Daniele, Direct synthesis of hexagonal NaGdF4 nanocrystals from a single-source precursor: Upconverting NaGdF4:Yb3+,Tm3+ and its composites with TiO2 for near-IR-driven photocatalysis. Chem. Asian J., 2014, 9, 2415‒2421.[3] a) S. Gahlot, E. Jeanneau, F. Dappozze, C. Guillard, S. Mishra, Precursor-mediated synthesis of Cu2-xSe nanoparticles and its composites with TiO2 for improved photocatalysis, Dalton Trans. 2018, 47, 8897–8905; b) S. Mishra, D. Du, E. Jeanneau, F. Dappozze, C. Guillard, J. Zhang, S. Daniele, A facile molecular precursor-based synthesis of Ag2Se nanoparticles and its composites with TiO2 for enhanced photocatalytic activity, Chem. Asian J. 2016, 11, 1658-1663
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Precursor-mediated synthesis of inorganic nanomaterials for catalytic applications
HAL CCSD, 2019Co-Authors: Mishra S.Abstract:SSCI-VIDE+CDFA+SMRInternational audienceIndustrial development of chemical solution and vapor routes to inorganic nanomaterials (e.g., sol-gel, MOD, MOCVD…) is strongly dependent on the molecular engineering that involves design of tunable Metal-organic precursors having desirable properties. These molecular precursors are usually the starting point of the processes that influence the micro- & nano-structure and, therefore, the nature and the properties of the obtained materials.1-3 The use of well-defined precursors and isolation of molecular intermediates during molecules-to-nanoparticles transformation also allows to establish relationships between precursors and the final material and, therefore, to get some insight in to their transformation. This presentation will address different concepts of the ‘bottom-up’ approach of the synthesis of inorganic nanomaterials with a special emphasis placed on the design of homo or heteroMetallic (‘single-source’) precursors should have (i) a formulation that matches well with that of the final materials, particularly stoichiometry of Metals for multiMetallic materials, (ii) appropriate physicochemical properties (solubility, thermal stability, volatility…), (iii) the required chemical functionalities (coordination sphere with an appropriate set of ligands), and (iv) a clean, low temperature conversion into nanomaterials with minimized undesired residues in the end. Different catalytic applications of the obtained nanomaterials will be described. Keywords: molecular precursor, nanomaterials, Sol-Gel, Metal-organic decomposition, Metal Oxide, Metal selenide nanoparticles, Metal fluoride composites, photocatalysisREFERENCES [1] S. Mishra, S. Daniele, Metal-organic derivatives with fluorinated ligands as precursors for inorganic nanomaterials, Chem. Rev. 2015, 115, 8379-8448.[2] a) S. Mishra, F. Morfin, V. Mendez, P. N. Swamy, J.-L. Rousset, S. Daniele, Nanometric NaYF4 as an unconventional support for Gold catalysts for oxidation reactions, ACS Omega, 2019, 4, 5852−5861; b) Y. Chen, S. Mishra, G. Ledoux, E. Jeanneau, M. Daniel, J. Zhang, S. Daniele, Direct synthesis of hexagonal NaGdF4 nanocrystals from a single-source precursor: Upconverting NaGdF4:Yb3+,Tm3+ and its composites with TiO2 for near-IR-driven photocatalysis. Chem. Asian J., 2014, 9, 2415‒2421.[3] a) S. Gahlot, E. Jeanneau, F. Dappozze, C. Guillard, S. Mishra, Precursor-mediated synthesis of Cu2-xSe nanoparticles and its composites with TiO2 for improved photocatalysis, Dalton Trans. 2018, 47, 8897–8905; b) S. Mishra, D. Du, E. Jeanneau, F. Dappozze, C. Guillard, J. Zhang, S. Daniele, A facile molecular precursor-based synthesis of Ag2Se nanoparticles and its composites with TiO2 for enhanced photocatalytic activity, Chem. Asian J. 2016, 11, 1658-1663. [4] a) S. Mishra, E. Jeanneau, S. Mangematin, H. Chermette, M. Poor Kalhor, G. Bonnefont, G. Fantozzi, S. Le Floch, S. Pailhese, S. Daniele, A convenient and quantitative route to Sn(IV)–M [M = Ti(IV), Nb(V), Ta(V)] heterobiMetallic precursors for dense mixed-Metal Oxide Ceramics, Dalton Trans., 2015, 44, 6848–6862; b) S. Mishra, V. Mendez, E. Jeanneau, V. Caps, S. Daniele, A single source precursor route to group 13 homo- and heteroMetal Oxides as highly active supports for gold catalyzed aerobic epoxidation of t-stilbene, Eur. J. Inorg. Chem., 2013, 500‒510
Sanjay Mathur - One of the best experts on this subject based on the ideXlab platform.
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Functional Metal Oxide Ceramics as electron transport medium in photovoltaics and photo-electrocatalysis
Advanced Ceramics for Energy Conversion and Storage, 2019Co-Authors: Alexander Möllmann, Danny Bialuschewski, Yasuhiro Tachibana, Thomas Fischer, Sanjay MathurAbstract:Abstract Renewable energy technologies, such as photoelectrochemical (PEC) water splitting for solar fuel production and hybrid inorganic-organic hybrid perovskite solar cells as emerging alternative to current photovoltaic systems rely on functional Metal Oxide Ceramics to achieve high photocatalytic and photovoltaic (PV) efficiencies. Despite the differences in the underlying solar energy conversion mechanisms, Metal Oxides facilitate exciton separation and serve as efficient electron and hole transport materials, respectively. With their ease of fabrication, natural abundance, chemical stability, structural diversity, and variable photophysical properties Metal Oxide Ceramics become an integral component in the state-of-the-art PV and photocatalytic technologies. This chapter reviews current trends and research on Metal Oxide Ceramics in solar to energy conversion systems, as well as highlight the underlying understanding of charge carrier dynamics in these materials to achieve highly efficient PV and photocatalytic devices.
Pierre Gibot - One of the best experts on this subject based on the ideXlab platform.
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Synthesis of Oxide Ceramics in Detonating Atmosphere
MDPI AG, 2021Co-Authors: Pierre GibotAbstract:A detonation process based on 2,4,6 trinitrotoluene (TNT), used as an energetic reagent, was successfully implemented in the synthesis of a series of Metal Oxide Ceramics. TNT offers better physicochemical and mechanical properties than the energetic compounds traditionally used in such processes, thus offering safer handling and transport conditions. The experimental procedure, which consisted to of mixing the energetic molecule with a ceramic salt, was simple to perform. The detonation products were characterized by X-ray diffraction, scanning and transmission electron microscopies, energy dispersive X-ray spectroscopy and nitrogen physisorption. The as-synthesized ceramic powders (CeO2, HfO2, Nb2O5, and In2O3) were crystalline and made of nano-sized quasi-spherical particles. This investigation provides an enhanced detonation synthesis process for elaborating Ceramics. The majority of the Oxide materials mentioned in this study had never previously been prepared by the detonation process.
Alexander Möllmann - One of the best experts on this subject based on the ideXlab platform.
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Functional Metal Oxide Ceramics as electron transport medium in photovoltaics and photo-electrocatalysis
Advanced Ceramics for Energy Conversion and Storage, 2019Co-Authors: Alexander Möllmann, Danny Bialuschewski, Yasuhiro Tachibana, Thomas Fischer, Sanjay MathurAbstract:Abstract Renewable energy technologies, such as photoelectrochemical (PEC) water splitting for solar fuel production and hybrid inorganic-organic hybrid perovskite solar cells as emerging alternative to current photovoltaic systems rely on functional Metal Oxide Ceramics to achieve high photocatalytic and photovoltaic (PV) efficiencies. Despite the differences in the underlying solar energy conversion mechanisms, Metal Oxides facilitate exciton separation and serve as efficient electron and hole transport materials, respectively. With their ease of fabrication, natural abundance, chemical stability, structural diversity, and variable photophysical properties Metal Oxide Ceramics become an integral component in the state-of-the-art PV and photocatalytic technologies. This chapter reviews current trends and research on Metal Oxide Ceramics in solar to energy conversion systems, as well as highlight the underlying understanding of charge carrier dynamics in these materials to achieve highly efficient PV and photocatalytic devices.
Thomas Fischer - One of the best experts on this subject based on the ideXlab platform.
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Functional Metal Oxide Ceramics as electron transport medium in photovoltaics and photo-electrocatalysis
Advanced Ceramics for Energy Conversion and Storage, 2019Co-Authors: Alexander Möllmann, Danny Bialuschewski, Yasuhiro Tachibana, Thomas Fischer, Sanjay MathurAbstract:Abstract Renewable energy technologies, such as photoelectrochemical (PEC) water splitting for solar fuel production and hybrid inorganic-organic hybrid perovskite solar cells as emerging alternative to current photovoltaic systems rely on functional Metal Oxide Ceramics to achieve high photocatalytic and photovoltaic (PV) efficiencies. Despite the differences in the underlying solar energy conversion mechanisms, Metal Oxides facilitate exciton separation and serve as efficient electron and hole transport materials, respectively. With their ease of fabrication, natural abundance, chemical stability, structural diversity, and variable photophysical properties Metal Oxide Ceramics become an integral component in the state-of-the-art PV and photocatalytic technologies. This chapter reviews current trends and research on Metal Oxide Ceramics in solar to energy conversion systems, as well as highlight the underlying understanding of charge carrier dynamics in these materials to achieve highly efficient PV and photocatalytic devices.