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13 results on '"Mazaleyrat E"'

1. $1.62\mu \mathrm{m}$ Global Shutter Quantum Dot Image Sensor Optimized for Near and Shortwave Infrared

Author

Steckel, J. S., primary, Josse, E., additional, Pattantyus-Abraham, A. G., additional, Bidaud, M., additional, Mortini, B., additional, Bilgen, H., additional, Arnaud, O., additional, Allegret-Maret, S., additional, Saguin, F., additional, Mazet, L., additional, Lhostis, S., additional, Berger, T., additional, Haxaire, K., additional, Chapelon, L. L., additional, Parmigiani, L., additional, Gouraud, P., additional, Brihoum, M., additional, Bar, P., additional, Guillermet, M., additional, Favreau, S., additional, Duru, R., additional, Fantuz, J., additional, Ricq, S., additional, Ney, D., additional, Hammad, I., additional, Roy, D., additional, Arnaud, A., additional, Vianne, B., additional, Nayak, G., additional, Virollet, N., additional, Farys, V., additional, Malinge, P., additional, Tournier, A., additional, Lalanne, F., additional, Crocherie, A., additional, Galvier, J., additional, Rabary, S., additional, Noblanc, O., additional, Wehbe-Alause, H., additional, Acharya, S., additional, Singh, A., additional, Meitzner, J., additional, Aher, D., additional, Yang, H., additional, Romero, J., additional, Chen, B., additional, Hsu, C., additional, Cheng, K. C., additional, Chang, Y., additional, Sarmiento, M., additional, Grange, C., additional, Mazaleyrat, E., additional, and Rochereau, K., additional

Published
2021
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2. New SOFRADIR 10μm pixel pitch infrared products

Author

Lefoul, X., additional, Pere-Laperne, N., additional, Augey, T., additional, Rubaldo, L., additional, Aufranc, S., additional, Decaens, G., additional, Ricard, N., additional, Mazaleyrat, E., additional, Billon-Lanfrey, D., additional, Gravrand, O., additional, and Bisotto, S., additional

Published
2014
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3. Fully Optimized Cu based process with dedicated cavity etch for 1.75μm and 1.45μm pixel pitch CMOS Image Sensors

Author

Cohen, M., primary, Roy, F., additional, Herault, D., additional, Cazaux, Y., additional, Gandolfi, A., additional, Reynard, Jp., additional, Cowache, C., additional, Bruno, E., additional, Girault, T., additional, Vaillant, J., additional, Barbier, F., additional, Sanchez, Y., additional, Hotellier, N., additional, LeBorgne, O., additional, Augier, C., additional, Inard, A., additional, Jagueneau, T., additional, Zinck, C., additional, Michailos, J., additional, and Mazaleyrat, E., additional

Published
2006
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6. A Low-Noise Single-Photon Detector Implemented in a 130 nm CMOS Imaging Process

Author

Gersbach, M., Richardson, J., Mazaleyrat, E., Hardillier, S., Niclass, C., Grant, L., Henderson, R. K., and Charbon, E.

Subjects
Single-photon avalanche diode (SPAD), NCCR-MICS, Time-correlated single-photon counting (TCSPC), NCCR-MICS/CL2, CMOS single-photon detector, Geiger mode
Abstract

We report on a new single-photon avalanche diode (SPAD) fabricated in a 130 nm CMOS imaging process. A novel circular structure combining shallow trench isolation (STI) and a passivation implant creates an effective guard ring against premature edge breakdown. Thanks to this guard ring, unprecedented levels of miniaturization may be achieved at no cost of added noise, decreased sensitivity, or timing resolution. The detector, integrated along with quenching and readout electronics, was fully characterized. A second batch of detectors with decreased n-well doping was fabricated, thus reducing the dark count rate (DCR) by several orders of magnitude. To the best of our knowledge, the DCR per unit area achieved in these devices is the lowest ever reported in deep sub-micron CMOS SPADs. Optical measurements show the effectiveness of the guard ring and the high degree of electric field planarity across the sensitive region of the detector. With a photon detection probability (PDP) of up to 36% and a timing jitter of 125 ps at full-width-half-maximum, this SPAD is well-suited for applications such as 3D imaging, fluorescence lifetime imaging, and biophotonics.

10. Copper-assisted oxidation of catechols into quinone derivatives†

Author

Frédéric Chérioux, Johann Coraux, José I. Martínez, Valérie Guisset, José Angel Martín Gago, Estelle Mazaleyrat, José Abad, Ana Cristina Gómez-Herrero, Albano Cossaro, Simone Lisi, Alberto Verdini, Philippe David, Carlos Sánchez-Sánchez, Luca Floreano, Gomez-Herrero, A. C., Sanchez-Sanchez, C., Cherioux, F., Martinez, J. I., Abad, J., Floreano, L., Verdini, A., Cossaro, A., Mazaleyrat, E., Guisset, V., David, P., Lisi, S., Martin Gago, J. A., Coraux, J., Agence Nationale de la Recherche (France), Ministerio de Economía y Competitividad (España), Ministerio de Ciencia, Innovación y Universidades (España), European Research Council, Comunidad de Madrid, Centre National de la Recherche Scientifique (France), Consejo Superior de Investigaciones Científicas (España), Martínez, José I., Sánchez Sánchez, Carlos, Martín-Gago, José A., Systèmes hybrides de basse dimensionnalité (HYBRID), 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), Instituto de Ciencia de Materiales de Madrid (ICMM), Consejo Superior de Investigaciones Científicas [Madrid] (CSIC), Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174) (FEMTO-ST), Université de Technologie de Belfort-Montbeliard (UTBM)-Ecole Nationale Supérieure de Mécanique et des Microtechniques (ENSMM)-Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC)-Centre National de la Recherche Scientifique (CNRS), Universidad Politecnica de Cartagena, Laboratorio Nazionale TASC (TASC), Consiglio Nazionale delle Ricerche [Roma] (CNR)-INFM, Epitaxie et couches minces (EpiCM), Martínez, José I. [0000-0002-2086-8603], Sánchez Sánchez, Carlos [0000-0001-8644-3766], and Martín-Gago, José A. [0000-0003-2663-491X]

Subjects
Semiquinone, Catechols, Metal nanoparticles, 02 engineering and technology, Cathecols, 010402 general chemistry, Photochemistry, 01 natural sciences, Redox, Intermediate product, chemistry.chemical_compound, Degenerative diseases, Molecule, Catechol, Quinone derivatives, [CHIM.ORGA]Chemical Sciences/Organic chemistry, Substrate (chemistry), General Chemistry, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, 3. Good health, 0104 chemical sciences, Quinone, Copper-assisted oxidation, Chemistry, chemistry, Intramolecular force, 0210 nano-technology
Abstract

Catechols are ubiquitous substances often acting as antioxidants, thus of importance in a variety of biological processes. The Fenton and Haber–Weiss processes are thought to transform these molecules into aggressive reactive oxygen species (ROS), a source of oxidative stress and possibly inducing degenerative diseases. Here, using model conditions (ultrahigh vacuum and single crystals), we unveil another process capable of converting catechols into ROSs, namely an intramolecular redox reaction catalysed by a Cu surface. We focus on a tri-catechol, the hexahydroxytriphenylene molecule, and show that this antioxidant is thereby transformed into a semiquinone, as an intermediate product, and then into an even stronger oxidant, a quinone, as final product. We argue that the transformations occur via two intramolecular redox reactions: since the Cu surface cannot oxidise the molecules, the starting catechol and the semiquinone forms each are, at the same time, self-oxidised and self-reduced. Thanks to these reactions, the quinone and semiquinone are able to interact with the substrate by readily accepting electrons donated by the substrate. Our combined experimental surface science and ab initio analysis highlights the key role played by metal nanoparticles in the development of degenerative diseases., This work was supported by the French National Research Agency through contract ORGANI'SO (ANR-15-CE09-0017). A. C. G. H. and J. C. thank Laurence Magaud for fruitful discussion about the simulation of the structure of the molecules. F. C. thanks Sarah Benchabane for fruitful discussion. C. S. S., J. I. M. and J. A. M. G. acknowledge financial support from Spanish MINECO (MAT2017-85089-C2-1-R, RYC-2015-17730, RYC-2018-024364-I), European Research Council (ERC) under contract (ERC-2013-SYG-610256 NANOCOSMOS), Comunidad de Madrid via Programa de Investigación Tecnologías 2018 (FOTOART-CM S2018/NMT-4367), and the innovation program under grant agreements 785219 and 881603 (GrapheneCore2 and GrapheneCore3-Graphene-based disruptive technologies, respectively). E. M. acknowledges financial support from Région Rhône Alpes (ARC6 program) and the Labex LANEF. J. C. and J. A. M. G. acknowledges financial support from CNRS and CSIC via the IEA program (PIC2017-FR4/07981), under the ORGAN'X project.

Published
2020
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11. Highly Stable Low-Strain Flexible Sensors Based on Gold Nanoparticles/Silica Nanohelices.

Author

Amestoy A, Rangra A, Mansard V, Saya D, Pouget E, Mazaleyrat E, Severac F, Bergaud C, Oda R, and Delville MH

Abstract

Flexible strain sensors based on nanoparticle (NP) arrays show great potential for future applications such as electronic skin, flexible touchscreens, healthcare sensors, and robotics. However, even though these sensors can exhibit high sensitivity, they are usually not very stable under mechanical cycling and often exhibit large hysteresis, making them unsuitable for practical applications. In this work, strain sensors based on silica nanohelix (NH) arrays grafted with gold nanoparticles (AuNPs) can overcome these critical aspects. These 10 nm AuNPs are functionalized with mercaptopropionic acid (MPA) and different ratios of thiol-polyethylene glycol-carboxylic acid (HS-PEG7-COOH) to optimize the colloidal stability of the resulting NH@AuNPs nanocomposite suspensions, control their aggregation state, and tune the thickness of the insulating layer. They are then grafted covalently onto the surface of the NHs by chemical coupling. These nanomaterials exhibit a well-defined arrangement of AuNPs, which follows the helicity of the silica template. The modified NHs are then aligned by dielectrophoresis (DEP) between interdigitated electrodes on a flexible substrate. The flexibility, stability, and especially sensitivity of these sensors are then characterized by electromechanical measurements and scanning electron microscopy observations. These strain sensors based on NH@AuNPs nanocomposites are much more stable than those containing only nanoparticles and exhibit significantly reduced hysteresis and high sensitivity at very slight strains. They can retain their sensitivity even after 2 million consecutive cycles with virtually unchanged responsiveness. These improved performances come from their mechanical stability and the use of nanohelices as stable mechanical templates.

Published
2023
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12. Two-Way Twisting of a Confined Monolayer: Orientational Ordering within the van der Waals Gap between Graphene and Its Crystalline Substrate.

Author

Lisi S, Guisset V, David P, Mazaleyrat E, Gómez Herrero AC, and Coraux J

Abstract

Two-dimensional confinement of lattices produces a variety of order and disorder phenomena. When the confining walls have atomic granularity, unique structural phases are expected, of relevance in nanotribology, porous materials, or intercalation compounds where, e.g., electronic states can emerge accordingly. The interlayer's own order is frustrated by the competing interactions exerted by the two confining surfaces. We revisit the concept of orientational ordering, introduced by Novaco and McTague to describe the twist of incommensurate monolayers on crystalline surfaces. We predict a two-way twist of the monolayer as its density increases. We discover such a behavior in alkali atom monolayers (sodium, cesium) confined between graphene and an iridium surface, using scanning tunneling microscopy and electron diffraction.

Published
2022
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13. Copper-assisted oxidation of catechols into quinone derivatives.

Author

Gómez-Herrero AC, Sánchez-Sánchez C, Chérioux F, Martínez JI, Abad J, Floreano L, Verdini A, Cossaro A, Mazaleyrat E, Guisset V, David P, Lisi S, Martín Gago JA, and Coraux J

Abstract

Catechols are ubiquitous substances often acting as antioxidants, thus of importance in a variety of biological processes. The Fenton and Haber-Weiss processes are thought to transform these molecules into aggressive reactive oxygen species (ROS), a source of oxidative stress and possibly inducing degenerative diseases. Here, using model conditions (ultrahigh vacuum and single crystals), we unveil another process capable of converting catechols into ROSs, namely an intramolecular redox reaction catalysed by a Cu surface. We focus on a tri-catechol, the hexahydroxytriphenylene molecule, and show that this antioxidant is thereby transformed into a semiquinone, as an intermediate product, and then into an even stronger oxidant, a quinone, as final product. We argue that the transformations occur via two intramolecular redox reactions: since the Cu surface cannot oxidise the molecules, the starting catechol and the semiquinone forms each are, at the same time, self-oxidised and self-reduced. Thanks to these reactions, the quinone and semiquinone are able to interact with the substrate by readily accepting electrons donated by the substrate. Our combined experimental surface science and ab initio analysis highlights the key role played by metal nanoparticles in the development of degenerative diseases., Competing Interests: There are no conflicts to declare., (This journal is © The Royal Society of Chemistry.)

Published
2020
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