CNRS Laboratory of Condensed Matter Chemistry, Paris

Paris, France

CNRS Laboratory of Condensed Matter Chemistry, Paris

Paris, France

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Sanchez C.,CNRS Laboratory of Condensed Matter Chemistry, Paris | Belleville P.,CEA Le Ripault | Popall M.,Fraunhofer Institute for Silicate Research | Nicole L.,CNRS Laboratory of Condensed Matter Chemistry, Paris
Chemical Society Reviews | Year: 2011

Today cross-cutting approaches, where molecular engineering and clever processing are synergistically coupled, allow the chemist to tailor complex hybrid systems of various shapes with perfect mastery at different size scales, composition, functionality, and morphology. Hybrid materials with organic-inorganic or bio-inorganic character represent not only a new field of basic research but also, via their remarkable new properties and multifunctional nature, hybrids offer prospects for many new applications in extremely diverse fields. The description and discussion of the major applications of hybrid inorganic-organic (or biologic) materials are the major topic of this critical review. Indeed, today the very large set of accessible hybrid materials span a wide spectrum of properties which yield the emergence of innovative industrial applications in various domains such as optics, micro-electronics, transportation, health, energy, housing, and the environment among others (526 references). © 2011 The Royal Society of Chemistry.


Carretero-Genevrier A.,CNRS Laboratory of Condensed Matter Chemistry, Paris | Boissiere C.,CNRS Laboratory of Condensed Matter Chemistry, Paris | Nicole L.,CNRS Laboratory of Condensed Matter Chemistry, Paris | Grosso D.,CNRS Laboratory of Condensed Matter Chemistry, Paris
Journal of the American Chemical Society | Year: 2012

Spectroscopic ellipsometry was utilized to follow in situ photodegradation of organic species in the vicinity of TiO 2 nanoparticles during UV irradiation. Stacked layers composed of TiO 2, mesoporous SiO 2, and mixed mesoporous SiO 2/TiO 2 nanocomposites with controlled thickness and porosity were used as model materials. Lauric acid molecules and poly(vinyl chloride) (PVC) layers were used as model mobile and immobile pollutants, respectively. The local photocatalytic activity was deduced by monitoring the variation of the thickness and refractive index of each independent layer. We show that the photocatalyzed degradation of an organic pollutant takes place only when the latter is located in close vicinity to the TiO 2 nanoparticle surface or can naturally diffuse toward it. As a result, the reaction efficiency is directly related to the organic pollutant diffusion. We also show that the distance of photocatalysis efficiency (d s) at which radical intermediates are still present and active is <10 nm from the TiO 2 surface under the conditions of the experiments. This was confirmed by the fact that an immobile condensed organic phase such as PVC was protected from the photocatalytic degradation when separated from the TiO 2 by a 20 nm layer of mesoporous silica. © 2012 American Chemical Society.


Carenco S.,CNRS Laboratory of Condensed Matter Chemistry, Paris | Carenco S.,Collège de France
Chemistry - A European Journal | Year: 2014

Carbon monoxide is a ubiquitous molecule in surface science, materials chemistry, catalysis and nanotechnology. Its interaction with a number of metal surfaces is at the heart of major processes, such as Fischer-Tropsch synthesis or fuel-cell optimization. Recent works, coupling structural and nanoscale in situ analytic tools have highlighted the ability of metal surfaces and nanoparticles to undergo restructuring after exposure to CO under fairly mild conditions, generating nanostructures. This Minireview proposes a brief overview of recent examples of such nanostructuring, which leads to a discussion about the driving force in reversible and non-reversible situations. Nanoparticles and reactive surfaces: This Minireview provides an overview of selected CO-induced nanostructuring (see scheme). Recent examples of metal-surface and nanoparticle restructuring as a consequence of exposure to CO are discussed and show that nanoscale structures can be obtained under fairly mild conditions. Several cases of mono- and bimetallic compounds are described that show a range of behaviours in relation with the metal-CO interaction strength. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Lupan O.,CNRS Laboratory of Condensed Matter Chemistry, Paris | Pauporte T.,CNRS Laboratory of Condensed Matter Chemistry, Paris | Le Bahers T.,CNRS Laboratory of Condensed Matter Chemistry, Paris | Viana B.,Stefan Cel Mare University of Suceava | Ciofini I.,CNRS Laboratory of Condensed Matter Chemistry, Paris
Advanced Functional Materials | Year: 2011

The band-gap engineering of doped ZnO nanowires is of the utmost importance for tunable light-emitting-diode (LED) applications. A combined experimental and density-functional theory (DFT) study of ZnO doping by copper (Zn 2+ substitution by Cu2+) is presented. ZnO:Cu nanowires are epitaxially grown on magnesium-doped p-GaN by electrochemical deposition. The heterojunction is integrated into a LED structure. Efficient charge injection and radiative recombination in the Cu-doped ZnO nanowires are demonstrated. In the devices, the nanowires act as the light emitters. At room temperature, Cu-doped ZnO LEDs exhibit low-threshold emission voltage and electroluminescence emission shifted from the ultraviolet to violet-blue spectral region compared to pure ZnO LEDs. The emission wavelength can be tuned by changing the copper content in the ZnO nanoemitters. The shift is explained by DFT calculations with the appearance of copper d states in the ZnO band-gap and subsequent gap reduction upon doping. The presented data demonstrate the possibility to tune the band-gap of ZnO nanowire emitters by copper doping for nano-LEDs. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Drisko G.L.,CNRS Laboratory of Condensed Matter Chemistry, Paris | Sanchez C.,CNRS Laboratory of Condensed Matter Chemistry, Paris
European Journal of Inorganic Chemistry | Year: 2012

We introduce this themed issue of the European Journal of Inorganic Chemistry with a short overview of hybrid inorganic-organic materials. Hybrid materials have been used in society since antiquity, in fact the creative musings regarding hybridization began in ancient mythology. Now hybrid materials are ubiquitous, and so for clarity they have been divided into different classes and subgroups. These are explained and illustrated with notable synthetic and natural examples. The second half of this overview is devoted to some speculation about the future potential of hybrid materials based on some of the most exciting areas of development, such as artificial photosynthetic leaves, metamaterials, molecular machines, theranostics, 3D printing, nuclear waste storage, and the exploration of life's extraordinary evolutionary origins. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Faustini M.,CNRS Laboratory of Condensed Matter Chemistry, Paris | Boissiere C.,CNRS Laboratory of Condensed Matter Chemistry, Paris | Nicole L.,CNRS Laboratory of Condensed Matter Chemistry, Paris | Grosso D.,CNRS Laboratory of Condensed Matter Chemistry, Paris
Chemistry of Materials | Year: 2014

We present the conventional and emerging methods of preparation of nanostructured materials from chemical solution evaporation where precursors, reactants, and potential structuring agents are homogeneously dispersed or dissolved in a volatile solvent. The liquid is shaped as dictated by the selected process and undergoes evaporation that concentrates the nonvolatile species triggering various chemical phenomena such as reaction, self-assembly, phase separation, nucleation growth, aggregation, etc. While the composition of the final material depends on the initial solution stoichiometry, the morphology is governed by the process and the internal structure is adjusted by the kinetic and thermodynamic aspects of the coupled process. Because many processes involving the later approach exist, we decided to describe some of the more important processes, in terms of applicability and some of the more emerging processes, in terms of added value. More precisely, thin films, two-dimensional (2D) nano-in-micro patterns, hierarchical structures, and powders presented here were prepared by combining the solution evaporation with dip coating, microfabrication and nanofabrication, infiltration-replication (especially of butterfly wings), and, finally, spray drying, respectively. The efficiency, throughput, compatibility, and limitation of each process and method are discussed, together with related priority developments to be made in the future. © 2013 American Chemical Society.


Lei W.,Deakin University | Portehault D.,Collège de France | Portehault D.,CNRS Laboratory of Condensed Matter Chemistry, Paris | Liu D.,Deakin University | And 2 more authors.
Nature Communications | Year: 2013

Effective removal of oils, organic solvents and dyes from water is of significant, global importance for environmental and water source protection. Advanced sorbent materials with excellent sorption capacity need to be developed. Here we report porous boron nitride nanosheets with very high specific surface area that exhibit excellent sorption performances for a wide range of oils, solvents and dyes. The nanostructured material absorbs up to 33 times its own weight in oils and organic solvents while repelling water. The saturated boron nitride nanosheets can be readily cleaned for reuse by burning or heating in air because of their strong resistance to oxidation. This easy recyclability further demonstrates the potential of porous boron nitride nanosheets for water purification and treatment. © 2013 Macmillan Publishers Limited. All rights reserved.


Falco C.,Max Planck Institute for Colloids | Baccile N.,CNRS Laboratory of Condensed Matter Chemistry, Paris | Titirici M.-M.,Max Planck Institute for Colloids
Green Chemistry | Year: 2011

Hydrothermal carbonization (HTC) has demonstrated that it is an effective technique for the production of functionalized carbon materials from simple carbohydrates, such as monosaccharides and disaccharides. The chemical structure of the HTC carbon has been identified in detail by means of solid-state MAS 13C NMR investigations. However, it has not yet been clearly shown what the effects are of the processing temperature and time on the chemical structure and morphology of the generated HTC carbon. This study shows, with the help of SEM, elemental and yield analysis and solid-state MAS 13C NMR, the effects of these two key variables on the final nature of the produced material, allowing the development of a mechanistic model. According to the chosen set of processing parameters, the chemical structure of the HTC carbon can be tuned from polyfuran rich in oxygen containing functional groups to a carbon network of extensive aromatic domains. The same kind of investigation using lignocellulosic biomass as a carbon precursor shows a striking difference between the HTC mechanism of glucose and cellulose. The biopolymer, when it is treated under mild hydrothermal conditions (180-280 °C), tends to react according to a reaction scheme which leads to its direct transformation into an aromatic carbon network and which has strong similarities with classical pyrolysis. This journal is © The Royal Society of Chemistry.


Tran-Thi T.-H.,CEA Saclay Nuclear Research Center | Dagnelie R.,CEA Saclay Nuclear Research Center | Crunaire S.,CEA Saclay Nuclear Research Center | Nicole L.,CNRS Laboratory of Condensed Matter Chemistry, Paris
Chemical Society Reviews | Year: 2011

Sol-gel porous materials with tailored or nanostructured cavities have been increasingly used as nanoreactors for the enhancement of reactions between entrapped chemical reactants. The domains of applications issued from these designs and engineering are extremely wide. This tutorial review will focus on one of these domains, in particular on optical chemical sensors, which are the subject of extensive research and development in environment, industry and health. © 2011 The Royal Society of Chemistry.


Rozes L.,CNRS Laboratory of Condensed Matter Chemistry, Paris | Sanchez C.,CNRS Laboratory of Condensed Matter Chemistry, Paris
Chemical Society Reviews | Year: 2011

Titanium oxo-clusters, well-defined monodispersed nano-objects, are appropriate nano-building blocks for the preparation of organic-inorganic materials by a bottom up approach. This critical review proposes to present the different structures of titanium oxo-clusters referenced in the literature and the different strategies followed to build up hybrid materials with these versatile building units. In particular, this critical review cites and reports on the most important papers in the literature, concentrating on recent developments in the field of synthesis, characterization, and the use of titanium oxo-clusters for the construction of advanced hybrid materials (137 references). © 2011 The Royal Society of Chemistry.

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