Publications globales : [hal-02459643] Electronic excitations induced climb of dislocations in swift heavy ion irradiated AlN and AlxGa1−xN
29 janvier 2020
Recent work has shown that electronic excitations play a role in the creation of optical point defects in AlN although the material had been considered during a long time as insensitive to electronic energy loss and radiolysis. We address here an indirect observation of the effect of electronic (...)
[hal-02431621] Rare-earth doped selenides active waveguides for integrated mid-infrared sensing applications
8 janvier 2020
Mid-infrared (mid-IR) absorption spectroscopic techniques can provide inherent molecular selectivity and reach very low detection limits. They have therefore found applications in environmental, health or security domains. In parallel to the growing demand for the detection of traces molecules, (...)
[hal-02431554] Développement d’une source optique intégrée émettant dans le moyen infra-rouge à partir de verres de chalcogénure dopés par des ions de terres rares
8 janvier 2020
Cet article présente des résultats de photoluminescence (PL) guidée dans le moyen-infrarouge (2-5 µm) obtenus à partir de guides d’onde intégrés en verres de chalcogénure dopés par des ions Pr 3+ . La fabrication de verres de chalcogénures, leur dépôt par pulvérisation cathodique radiofréquence magnétron (...)
[hal-02413058] Effect of Cooling Rate on Dopant Spatial Localization and Phase Transformation in Cu‐Doped Y‐Stabilized ZrO2 Nanopowders
17 décembre 2019
The effect of calcination temperature (TC = 500–1000 °C) and cooling rate on the dopant distribution in Cu‐doped Y‐stabilized ZrO2 nanopowders is studied. The powders are produced by co‐precipitation technique and investigated by attenuated total reflection, UV‐vis diffuse reflectance, electron (...)
[hal-02410411] Sodalite cages of EMT zeolite confined neutral molecular-like silver clusters
13 décembre 2019
Stable luminescent silver clusters in nanosized EMT zeolite suspension were prepared and directly observed with high-resolution transmission electron microscopy (HRTEM). The luminescence of the Ag clusters remains stable in time due to their stabilization within the sodalite cages (0.7 nm) of (...)
[cea-02380535] Raman spectroscopy study of damage induced in cerium dioxide by swift heavy ion irradiations
26 novembre 2019
The damage induced in cerium dioxide by swift heavy ion irradiation was studied by micro-Raman spectroscopy. For this purpose, polycrystalline sintered pellets were irradiated by 100-MeV Kr, 200-MeV Xe, 10-MeV, and 36-MeV W ions in a wide range of fluence and stopping power (up to ∼28 MeV μm⁻¹). (...)
[cea-02341246] Multilayer coating radiation tolerance revealed by IBA
7 novembre 2019
Nanostructuration has opened the way for designing materials with improved properties by taking advantage of multiple interfaces providing enhanced local physical properties. In this frame, nanostructured materials are envisioned for nuclear applications owing to severe environmental conditions (...)
[hal-02340891] Single step hydrothermal synthesis of mixed valent V 6 O 13 nano-architectures : A case study of the possible applications in electrochemical energy conversion
31 octobre 2019
Availability of several stable vanadium oxidation states offers numerous advantages in terms of applications but at the same time it poses great challenge to isolate them in single phase during their synthesis process. In this study, we developed a facile single step hydrothermal synthesis of (...)
[hal-02340884] Radioresistance of Adenine to Cosmic Rays
31 octobre 2019
The presence of nucleobases in carbonaceous meteorites on Earth is an indication of the existence of this class of molecules in outer space. However, space is permeated by ionizing radiation, which can have damaging effects on these molecules. Adenine is a purine nucleobase that amalgamates (...)
[hal-02340881] Implantation damage formation in a-, c- and m-plane GaN
31 octobre 2019
Epitaxial GaN layers with a-, c- and m-plane surface orientations were implanted with 300 keV Ar-ions at 15 K with fluences ranging from 2 × 1012 to 4 × 1016 at/cm2. Damage build-up proceeds in three steps separated by wide fluence regions where the maximum damage level, measured by in situ (...)
[hal-02340871] Charge-state related effects in sputtering of LiF by swift heavy ions
31 octobre 2019
Sputtering experiments with swift heavy ions in the electronic energy loss regime were performed by using the catcher technique in combination with elastic recoil detection analysis. The angular distribution of particles sputtered from the surface of LiF single crystals is composed of a (...)
[hal-02340892] Effect of Cu doping on the structure and phase transition of directly synthesized FePt nanoparticles
31 octobre 2019
In this work, ternary Cu doped FePt nanoparticles were prepared in hexadecylamine at 320 °C by choosing FeCl2 as the Fe source. The experimental results showed that without Cu doping the as-prepared FePt nanoparticles possessed fcc structure and gradually exhibited typical fct diffraction peaks (...)
[hal-02340890] Ion irradiation of pure and amorphous CH 4 ice relevant for astrophysical environments
31 octobre 2019
This work presents a physicochemical study of frozen amorphous methane (at 16 K) under bombardment by medium-mass ions (15.7 MeV 16O5+) with implications for icy bodies in the outer Solar System exposed to the action of cosmic rays and energetic particles. The experiment was performed at the (...)
[hal-01633706] Metrological Analysis of the DIC Ultimate Error Regime
22 octobre 2019
In DIC, the “ultimate error regime” corresponds to situations for which the shape function used to describe the material transformation perfectly matches the actual one. We propose to confront results obtained from numerically-shifted images with the predictions of theoretical models developed in (...)
[hal-02175450] Caractérisation par nanoindentation du GaN irradié par des ions uranium de grande énergie
5 juillet 2019
Le comportement mécanique de films minces de nitrure de gallium GaN irradiés par des ions uranium accélérés a été étudié par nanoindentation. Les résultats montrent une décroissance des propriétés mécaniques du matériau par irradiation, corrélée à l’augmentation de la fluence des ions U utilisés. La (...)
[hal-02166080] P-i-n InGaN homojunctions (10–40% In) synthesized by plasma-assisted molecular beam epitaxy with extended photoresponse to 600 nm
26 juin 2019
We report the influence of the In mole fraction on the material and electrical characteristics of p-i-n InxGa1−xN homojunctions (x=0.10–0.40) synthesized by plasma-assisted molecular-beam epitaxy on GaN-on-sapphire substrates. Junctions terminated with p-InGaN present improved carrier extraction (...)
[hal-02162392] Pulsed laser deposition of Sr 2 FeMoO 6 thin films grown on spark plasma sintered Sr 2 MgWO 6 substrates
21 juin 2019
Sr2FeMoO6 (SFMO) films were deposited on polycrystalline spark plasma synthesized Sr2MgWO6 (SMWO) substrates. Films were grown using pulsed laser deposition at temperatures (T dep) between 720 °C and 820 °C in a vacuum environment of pressure $P_\textdep=10^-6$ mbar (0.1 mPa); after deposition (...)
[hal-02112085] Pulsed laser deposition of Sr 2 FeMoO 6 thin films grown on spark plasma sintered Sr 2 MgWO 6 substrates
26 avril 2019
Sr2FeMoO6 (SFMO) films were deposited on polycrystalline spark plasma synthesized Sr2MgWO6 (SMWO) substrates. Films were grown using pulsed laser deposition at temperatures (T dep) between 720 °C and 820 °C in a vacuum environment of pressure $P_\textdep=10^-6$ mbar (0.1 mPa); after deposition (...)
[hal-02110833] Instrumentation for ice crystal characterization in laboratory using interferometric out-of-focus imaging
25 avril 2019
Airborne characterization of ice crystals has important applications. The extreme difficulty of realizing in situ tests requires the development of a complete instrumentation in the laboratory. Such an installation should enable design, development, test, and calibration of instruments in (...)
[hal-02110843] Digital micromirror device as programmable rough particle in interferometric particle imaging
25 avril 2019
The 2D autocorrelation of the projection of an irregular rough particle can be estimated using the analysis of its interferometric out-of-focus image. We report the development of an experimental setup that creates speckle-like patterns generated by “programmable” rough particles of (...)
[hal-02107497] Simulation of field-induced molecular dissociation in atom-probe tomography : Identification of a neutral emission channel
23 avril 2019
We investigate the dynamics of dicationic metal-oxide molecules under large electric-field conditions, on the basis of ab initio calculations coupled to molecular dynamics. Applied to the case of ZnO2+ in the field of atom probe tomography (APT), our simulation reveals the dissociation into (...)
[hal-02107463] Electronic structure and stability of the SiO 2+ dications produced in tomographic atom probe experiments
23 avril 2019
The molecular electronic states of the SiO2+ dication have been investigated in a joint theoretical and experimental analysis. The use of a tip-shaped sample for tomographic atom probe analysis offers the unique opportunity to produce and to analyze the lifetime of some excited states of this (...)
[hal-01990273] Radiation response of nano-crystalline cubic Zirconia : Comparison between nuclear energy loss and electronic energy loss regimes
27 février 2019
Nano-crystalline stabilizer free cubic Zirconia films were irradiated with 400 keV Kr and 80 MeV Ag ions in order to compare the effects of nuclear collisions and electronic excitations on nano-structured materials. Grazing incidence X-ray diffraction (GIXRD) and transmission electron (...)
[hal-02050659] Evaluación de la contribucion de electrones Auger y efectos relativistas en la determinación de valores-w por impacto de electrones
27 février 2019
Los valores-W, definidos como la energía media requerida para generar un par iónico en un determinado medio por impacto de radiación ionizante, representan uno de los principales parámetros físicos que intervienen en dosimetría de referencia en radioterapia y hadronterapia [1]. En general, la (...)
[hal-01959784] The TRAMOS pixel as a photo-detection device : design, architecture and building blocks
19 décembre 2018
The deep trapping gate device concept for charged particle detection was recently introduced in Saclay/IRFU. It is based on an n-MOS structure in which a buried gate, located below the n-channel, collects carriers which are generated by ionizing particles. They deposit their energy in a volume (...)
[hal-01897245] Upgrade of the GTS Electron Cyclotron Resonance Ion Source at GANIL
17 octobre 2018
The GTS (Grenoble Test Source) electron cyclotron resonance ion source, operated at 14:5 GHz, provides multiply charged heavy ion beams for the ARIBE (Accélérateurs pour les Recherches Interdisciplinaires avec les Ions de Basse Energie) facility at GANIL (Grand Accélérateur National d’Ions Lourds). (...)
[hal-01862968] 2.3 μm Tm^3+:YLF mode-locked laser
28 août 2018
A passively mode-locked Tm:YLF laser emitting at 2.3 μm is reported for the first time, to the best of our knowledge. The continuous-wave stable mode-locking operation is obtained with a semiconductor saturable absorber mirror at a repetition rate of 100 MHz. The average output power is 165 mW (...)
[hal-01862963] 1.91 μm Diode-pumped Tm3+:YLF Bulk Laser Passively Mode-locked with GaAs-based SESAM
28 août 2018
We report on a passively mode-locked diode-pumped Tm3+:YLF oscillator operating at the central wavelength of 1.91 µm. The laser is mode-locked with a GaAs-based SESAM and emits a pulse train at 95 MHz with a maximal power of 73 (...)
[hal-01630978] Frequency Conversion Layers for Si Solar Cell Efficiency Improvement
10 juillet 2018
SiNx and SiNx: Tb3+ thin layers deposited by reactive magnetron co-sputtering have been studied with the aim of optimizing the light management in Si solar cells. Those Si-based layers are developed to be compatible with the Si-PV technology. An efficient energy transfer between matrix and (...)
[hal-01833668] High-energy collision-induced dissociation of histidine ions [His + H]+ and [His − H]− and histidine dimer [His2 + H]+
9 juillet 2018
Rationale Histidine (His) is an essential amino acid, whose side group consists of an aromatic imidazole moiety that can bind a proton or metal cation and act as a donor in intermolecular interactions in many biological processes. While the dissociation of His monomer ions is well known, (...)
[hal-01795748] Tungsten oxide thin film exposed to low energy He plasma : Evidence for a thermal enhancement of the erosion yield
18 mai 2018
Nanocrystalline tungsten oxide thin films (about 75 nm in thickness) produced by thermal oxidation of tungsten substrates were exposed to low energy He plasma (≈ 20 eV/He) with a flux of 2.5×10 18 m-2 s-1 at two temperatures: room temperature and 673 K. The structure and morphology modifications (...)
[hal-01795668] Tungsten oxide thin film exposed to low energy He plasma : Evidence for a thermal enhancement of the erosion yield
18 mai 2018
Nanocrystalline tungsten oxide thin films (about 75 nm in thickness) produced by thermal oxidation of tungsten substrates were exposed to low energy He plasma (approximate to 20 eV/He) with a flux of 2.5 x 10(18) m(-2) s(-1) at two temperatures: room temperature and 673 K. The structure and (...)
[hal-01763084] Estimation conjointe du canal et de l’offset de fréquence pour l’UFMC
12 avril 2018
– La modulation UFMC (Universal-filtered multi-carrier) est une nouvelle modulation multiporteuses incluant des filtres pour les sous-bandes, qui vise à remplacer la modulation OFDM (Orthogonal Frequency Division Multiplexing). L'objectif de l'UFMC est de relâcher les contraintes de (...)
[tel-01743723] Spectroscopie et caractérisation laser de cristaux massifs et de couches minces cristallines de fluorures dopés terres rares autour de 2um
26 mars 2018
Depuis les années 1970, le développement des sources lasers de puissance fonctionnant autour de 2 µm basées sur des cristaux dopés Thulium Tm3+ et/ou Holmium Ho3+est un domaine de recherche actif du fait de ses multiples applications. L’émission autour de 1.9 µm correspond à une transition du niveau (...)
[tel-01743804] Interactions of slow multiply charged ions with large, free radiosensitizing metallic nanoparticles
26 mars 2018
This thesis presents a study of the interaction of multiply charged ions with metallic nano-sized particles both in the context of fundamental processes and possible applications as radiosensitizers in nanoparticle-enhanced hadrontherapy. For this purpose a new experimental set-up has been (...)
[hal-01731451] Modélisation biophysique de l’effet radiosensibilisant des nanoparticles à élément lourd
14 mars 2018
Le principal défi de la radiothérapie est de concentrer les effets de dose au sein des cellules cancéreuses, tout en épargnant les tissus sains environnants. Parmi les différentes stratégies possibles, l’utilisation de radiosensibilisants permet d’amplifier les effets destructeurs de la dose dans la (...)
[tel-01729037] Elaboration et caractérisation de films d’oxynitrure de silicium dopés cérium et ytterbium : applications aux diodes électroluminescentes et au découpage quantique pour les cellules solaires
12 mars 2018
Cette thèse porte sur les applications optiques de films d’oxynitrures de silicium dopés cérium et co-dopés cérium-ytterbium élaborés par pulvérisation cathodique magnétron radiofréquence. Les paramètres de dépôt ont été optimisés afin d’obtenir une intense émission visible à l’œil nu des ions Ce3+ dans la (...)
[tel-01698831] Investigation of ternary ΑlΙnΝ and quaternary ΑlGaΙnΝ alloys for high electron mobility transistors by transmission electron microscopy
5 mars 2018
Group III-Nitrides and their alloys exhibit outstanding properties and are being extensively investigated since the 90’s. In comparison to other III-V semiconductors, III-nitrides (AlGaN, InGaN, and AlInN) cover from deep ultraviolet (UV) to near infrared (IR) across the visible range of (...)
[tel-01717558] Investigation of ternary ΑlΙnΝ and quaternary ΑlGaΙnΝ alloys for high electron mobility transistors by transmission electron microscopy
26 février 2018
Group III-Nitrides and their alloys exhibit outstanding properties and are being extensively investigated since the 90’s. In comparison to other III-V semiconductors, III-nitrides (AlGaN, InGaN, and AlInN) cover from deep ultraviolet (UV) to near infrared (IR) across the visible range of (...)
[tel-01698831] Investigation of ternary AlInN and quaternary AlGaInN alloys for High Electron Mobility Transistors by Transmission Electron Microscopy
15 février 2018
Group III-Nitrides and their alloys exhibit outstanding properties and are being extensively investigated since the 90’s. In comparison to other III-V semiconductors, III-nitrides (AlGaN, InGaN, and AlInN) cover from deep ultraviolet (UV) to near infrared (IR) across the visible range of (...)
[tel-01698831] Investigation of ternary AlInN and quaternary AlGaInN alloys for High Electron Mobility Transistors by Transmission Electron Microscopy
8 février 2018
Group III-Nitrides and their alloys exhibit outstanding properties and are being extensively investigated since the 90’s. In comparison to other III-V semiconductors, III-nitrides (AlGaN, InGaN, and AlInN) cover from deep ultraviolet (UV) to near infrared (IR) across the visible range of (...)
[hal-01703846] Limits in point to point resolution of MOS based pixels detector arrays
8 février 2018
In high energy physics point-to-point resolution is a key prerequisite for particle detector pixel arrays. Current and future experiments require the development of inner-detectors able to resolve the tracks of particles down to the micron range. Present-day technologies, although not fully (...)
[tel-01698831] Investigation of ternary AlInN and quaternary AlGaInN alloys for High Electron Mobility Transistors by Transmission Electron
6 février 2018
Group III-Nitrides and their alloys exhibit outstanding properties and are being extensively investigated since the 90’s. In comparison to other III-V semiconductors, III-nitrides (AlGaN, InGaN, and AlInN) cover from deep ultraviolet (UV) to near infrared (IR) across the visible range of (...)
[tel-01689891] Simulation de fluorure et d’hydroxyde dans des agrégats d’eau : Vers la dynamique sur l’état excité en solution
22 janvier 2018
Nous étudions la dynamique d’anions hydroxyde et fluorure micro-solvatés dans un agrégat d’eau après photo-excitation. Du fait du coût numérique important des calculs ab-initio et de la faible transférabilité des potentiels modèles de la littérature, nous avons développé un nouveau modèle transférable (...)
[tel-01689866] Nd Lu CaF2 for high-energy lasers
22 janvier 2018
It was recently demonstrated that efficient and broadband laser emission was possible with Nd-doped CaF2 and SrF2 single crystals around 1.05 µm. Such laser emission, known as completely quenched because of cross-relaxation in the singly doped fluorites, increases spectacularly by co-doping with (...)
[hal-01669642] The Neutrons for Science Facility at SPIRAL-2
21 décembre 2017
The neutrons for science (NFS) facility is a component of SPIRAL-2, the new superconducting linear accelerator built at GANIL in Caen (France). The proton and deuteron beams delivered by the accelerator will allow producing intense neutron fields in the 100 keV–40 MeV energy range. Continuous (...)
[tel-01665361] Effet du rayonnement cosmique galactique sur les petits corps glacés du système solaire externe : indices pour la formation de la matière organique des micrométéorites antarctiques ultra-carbonées
15 décembre 2017
Les météorites et particules de poussière interplanétaire apportent des contraintes sur la formation et l’évolution de la matière dans le système solaire. Les micrométéorites, dont certaines proviennent des régions externes du système solaire, représentent la source dominante de matière extraterrestre (...)
[tel-01663572] Study of a unidirectional flax reinforcement for biobased composite
14 décembre 2017
In this Ph.D work, unidirectional flax fiber composite (UD biobased composite) has been designed and manufactured based on the hot platen press process. Plant fiber composites usually exhibit two regions under tensile load, but three regions have been identified in this work. A phenomenological (...)
[tel-01660412] Effets du rayonnement cosmique galactique sur les petits corps glacés du système solaire externe : indices pour la formation de la matière organique des micrométéorites antarctiques ultracarbonées
11 décembre 2017
Les météorites et particules de poussière interplanétaire apportent des contraintes sur la formation et l'évolution de la matière dans le système solaire. Les micrométéorites, dont certaines proviennent des régions externes du système solaire, représentent la source dominante de matière extraterrestre (...)
[hal-01645814] Anisotropic two-body dissociation by highly charged ion impact
23 novembre 2017
The angular distribution of fragment emission with respect to the incoming beam direction is measured. In case of two body breakup of di-cationic molecular ions, such as D2O 2+ and C2H 2+ 2 , a strong anisotropy is observed when one of the fragments is an H+ or D+. These molecular ions were (...)
[hal-01642402] Role of a Neighbor Ion in the Fragmentation Dynamics of Covalent Molecules
21 novembre 2017
Fragmentation of molecular nitrogen dimers ðN2Þ2 induced by collision with low energy 90 keV Ar9þ ions is studied to evidence the influence of a molecular environment on the fragmentation dynamics of N2 cations. Following the capture of three or four electrons from the dimer, the three-body Nþ 2 þ (...)
[hal-01642335] Anisotropic two-body dissociation by highly charged ion impact
21 novembre 2017
The angular distribution of fragment emission with respect to the incoming beam direction is measured. In case of two body breakup of di-cationic molecular ions, such as D2O 2+ and C2H 2+ 2 , a strong anisotropy is observed when one of the fragments is an H+ or D+. These molecular ions were (...)
[hal-01634510] The ELI-ALPS facility : the next generation of attosecond sources
14 novembre 2017
[...]
[hal-01607954] Multiple electron capture from isolated protein poly-anions in collision with slow highly charged ions
6 novembre 2017
Collisions of 375 keV Xe25+ ions with trapped mass/charge selected poly-anions of the cytochrome C protein (similar to 12.5 kDa) were studied by coupling a linear quadrupole ion trap with low-energy ion beam facility. Tandem mass spectra were recorded for the protein precursor charge states (...)
[hal-01622298] Biophysical modelisation of gold nanoparticles radiosensi-tizing effects
24 octobre 2017
The main challenge of radiotherapy is to focus the irradiation dose in cancer cells while preserving the healthy cells surrounding the tumor. Among the different strategies, the use of radiosensitizers aims to amplify the destructive effects of dose in the tumor1. Nanoparticles of heavy metals (...)
[hal-01620547] Biophysical modelisation of gold nanoparticles radiosensitizing effects
20 octobre 2017
The main challenge of radiotherapy is to focus the irradiation dose in cancer cells while preserving the healthy cells surrounding the tumor. Among the different strategies, the use of radiosensitizers aims to amplify the destructive effects of dose in the tumor [1]. Nanoparticles of heavy (...)
[hal-01620034] Shortcut in DIC error assessment induced by image interpolation used for subpixel shifting
20 octobre 2017
In order to characterize errors of Digital Image Correlation (DIC) algorithms, sets of virtual images are often generated from a reference image by in-plane sub-pixel translations. This leads to the determination of the well-known S-shaped bias error curves and their corresponding random error (...)
[in2p3-01617779] Upgrade of the GTS Electron Cyclotron Resonance Ion Source at GANIL
17 octobre 2017
The GTS (Grenoble Test Source) electron cyclotron resonance ion source, operated at 14.5 GHz, provides multiply charged heavy ion beams for the ARIBE (Accélérateurs pour les Recherches Interdisciplinaires avec les Ions de Basse Energie) facility at GANIL (Grand Accélérateur National d’Ions Lourds). (...)
[hal-01611179] 2.3 mu Tm3+ : YLF mode-locked laser
5 octobre 2017
A passively mode-locked Tm: YLF laser emitting at 2.3 mu m is reported for the first time, to the best of our knowledge. The continuous-wave stable mode-locking operation is obtained with a semiconductor saturable absorber mirror at a repetition rate of 100 MHz. The average output power is 165 (...)
[hal-01611169] Instrumentation for ice crystal characterization in laboratory using interferometric out-of-focus imaging
5 octobre 2017
Airborne characterization of ice crystals has important applications. The extreme difficulty of realizing in situ tests requires the development of a complete instrumentation in the laboratory. Such an installation should enable design, development, test, and calibration of instruments in (...)
[hal-01596425] Purification of sclareol by supercritical CO2 fractionation process
27 septembre 2017
The implementation and optimization of continuous supercritical CO2 fractionation of a clary sage extract containing 25 wt% of sclareol were performed in order to increase its sclareol content. After preliminary experiments confirming the feasibility of the process, different operating (...)
[hal-01579009] Prospective validation of a lymphocyte infiltration prognostic test in stage III colon cancer patients treated with adjuvant FOLFOX.
30 août 2017
Background The prognostic value of lymphocyte infiltration (LI) of colorectal carcinoma (CC) has been demonstrated by several groups. However, no validated test is currently available for clinical practice. We previously described an automated and reproducible method for testing LI and aimed to (...)
[hal-01577239] Assessment of Digital Image Correlation Measurement Accuracy in the Ultimate Error Regime : Improved Models of Systematic and Random Errors
25 août 2017
The literature contains many studies on assessment of DIC uncertainties, particularly in the ultimate error regime, when the shape function used to describe the material transformation perfectly matches the actual transformation. For pure sub-pixel translations, bias and random errors obtained (...)
[hal-01560627] Impact of Gate Drain Spacing on Low-Frequency Noise Performance of In Situ SiN Passivated InAlGaN/GaN MIS-HEMTs
17 juillet 2017
In this paper we investigated the gate–drain access region spacing (L GD) effect on electrical and noise performance of InAlGaN/GaN metal– insulator–semiconductor high electron mobility transistors (MIS-HEMTs) using in situ SiN cap layer as gate insulator. Different L GD of InAlGaN/GaN MIS-HEMTs (...)
[hal-01532166] Rare-earth doped chalcogenide glasses for mid-IR gas sensor applications
2 juin 2017
Luminescence properties of Pr3+ and Dy3+ doped GaGeSbSe(S) vitreous systems have been studied. The synthesis process to obtain homogeneous glasses has been determined and fibers have been successfully drawn from the produced preforms and characterized. Fibers show a mid-IR luminescence matching (...)
[hal-01528406] Down-shifting Si-based layer for Si solar applications
31 mai 2017
SiNx and SiNx:Tb3+ thin layers were deposited by reactive magnetron co-sputtering with the objective of optimizing the light management in Si solar cells. Those Si-based layers are developed to be compatible with the Si-PV technology. An efficient energy transfer between SiNx matrix and terbium (...)
[hal-01523022] Composite stratifié hybride carbone/lin : caractérisation des renforts Carbon
17 mai 2017
La caractérisation du renfort est importante pour bien comprendre le comportement d'un matériau composite lors de sa mise en oeuvre. Dans cet article, le travail de caractérisation réalisé sur des renforts tissés de lin et de carbone sera présenté. Des observations à la caméra ont été réalisées sur le (...)
[hal-01425234] Fluorenyl Zinc Phosphonate Zn(H 2 O)PO 3 -C 13 H 9 ·H 2 O : Hybrid Columnar Structure with Strong C-H···π Interactions
16 mai 2017
A new zinc phosphonate Zn(H2O)PO3–C13H9·H2O with a columnar structure was synthesized in hydrothermal conditions. This compound crystallizes in space group P21/c [a = 15.832(4) Å, b =5.1915(10) Å, c = 17.519(4) Å and β = 114.479(6)°]. Its inorganic framework consists of isolated chains of (...)
[hal-01517558] Thermo-stimulated evolution of crystalline structure and dopant distribution in Cu-doped Y- stabilized ZrO 2 nanopowders
11 mai 2017
This work deals with the effect of Cu doping on thermal stability of the structural properties of Y-stabilized ZrO2 nanopowders and dopants’ spatial distribution. The powders were synthesized by a co-precipitation technique, calcinated at Tc = 500–1100 °C during 2 h and studied by x-ray (...)
[hal-01517548] Impurity-Governed Modification of Optical and Structural Properties of ZrO 2 -Based Composites Doped with Cu and Y
9 mai 2017
The influence of calcination temperature on copper spatial localization in Y-stabilized ZrO 2 powders was studied by attenuated total reflection, diffuse reflectance, electron paramagnetic resonance, transmission electron microscopy, electron energy loss, and energy-dispersive X-ray (...)
[hal-01507361] Alignment control and atomically-scaled heteroepitaxial interface study of GaN nanowires
13 avril 2017
Well-aligned GaN nanowires are promising candidates for building high-performance optoelectronic nanodevices. In this work, we demonstrate the epitaxial growth of well-aligned GaN nanowires on a [0001]-oriented sapphire substrate in a simple catalyst-assisted chemical vapor deposition process (...)
[hal-01504807] Modélisation biophysique des effets radiosensibilisants des nanoparticules
10 avril 2017
L’enjeu majeur de la radiothérapie est de concentrer la dose d’irradiation dans les cellules cancéreuses tout en épargnant au mieux les cellules saines. Parmi les stratégies envisagées, l’utilisation de radiosensibilisants vise à amplifier les effets destructeurs de dose dans la tumeur. Les (...)
[cea-01493350] In situ and time-resolved infrared detection of the reactivity induced by electrons in polymer films
22 mars 2017
The real time and in situ analysis of chemical reactions such as polymerization reactions, polymer degradation, and oxidation of polymers is of utmost importance. Surprisingly, only few experimental tools allowing this are available. To bridge this gap, we have developed a new experimental (...)
[in2p3-01347982] Characterization and performances of DOSION, a dosimetry equipment dedicated to radiobiology experiments taking place at GANIL
17 mars 2017
Currently,radiobiology experiments using heavy ions at GANIL GrandAccélérateurNationald’IonsLourds) are conducted under the supervision of the CIMAP (Center for research on Ions, MAterials and Photonics). In this context, a new beam monitoring equipment named DOSION has been developed. It allows (...)
[hal-01467998] Sodalite cages of EMT zeolite confined neutral molecular-like silver clusters
15 février 2017
Stable luminescent silver clusters in nanosized EMT zeolite suspension were prepared and directly observed with high-resolution transmission electron microscopy (HRTEM). The luminescence of the Ag clusters remains stable in time due to their stabilization within the sodalite cages (0.7 nm) of (...)
[in2p3-01464846] Role of a Neighbor Ion in the Fragmentation Dynamics of Covalent Molecules
10 février 2017
Fragmentation of molecular nitrogen dimers (N2)2 induced by collision with low energy 135 keV Ar 9+ ions is studied to evidence the influence of a molecular environment on the fragmentation dynamics of N2 cations. Following the capture of three or four electrons from the dimer, the 3-body N + 2 (...)
[hal-01453463] Structural and emission properties of Tb3+-doped nitrogen-rich silicon oxynitride films
3 février 2017
Terbium doped silicon oxynitride host matrix is suitable for various applications such as light emitters compatible with CMOS technology or frequency converter systems for photovoltaic cells. In this study, amorphous Tb3+ ion doped nitrogen-rich silicon oxynitride (NRSON) thin films were (...)