Publications

Affichage de 4451 à 4460 sur 16058

ART

Pore network of cement hydrates in a high performance concrete by 3D FIB/SEM - Implications for macroscopic fluid transport

Yang Song, Catherine Davy, David Troadec, Xavier Bourbon

The pore structure of a mature industrial High Performance Concrete (HPC) is characterized at the scale of its cement hydrates with 3D Focused Ion Beam/Scanning Electron Microscopy (FIB/SEM). The considered scale is a mesoscale, with sample volumes of 61–118 μm3, and voxel sizes of 5.9 × 7.5 × 10 …

Cement and Concrete Research, 2019, 115, pp.308-326. ⟨10.1016/j.cemconres.2018.08.004⟩. ⟨hal-02974921⟩

ART

High performance and highly robust AlN/GaN HEMTs for millimeter-wave operation

Kathia Harrouche, Riad Kabouche, Etienne Okada, F Medjdoub

We report on a 3 nm AlN/GaN HEMT technology for millimeter-wave applications. Electrical characteristics for a 110 nm gate length show a maximum drain current density of 1.2 A/mm, an excellent electron confinement with a low leakage current below 10 μA/mm, a high breakdown voltage and a F T /F max…

IEEE Journal of the Electron Devices Society, 2019, 7, pp.1145-1150. ⟨10.1109/JEDS.2019.2952314⟩. ⟨hal-02357492⟩

ART

Challenges and prospects of 3D micro-supercapacitors for powering the internet of things

Christophe Lethien, Jean Le Bideau, Jean Brousse

The fabrication of miniaturized electrochemical energy storage systems is essential for the development of future electronic devices for Internet of Things applications where connected devices are increasingly deployed in our daily life. On chip micro-supercapacitors are an attractive solution to…

Energy & Environmental Science, 2019, 12 (1), pp.96-115. ⟨10.1039/C8EE02029A⟩. ⟨hal-02020418⟩

COMM

Nano-particle mass sensing using phononic pillars

Bonhomme Jeremy, Oudich Mourad, Bahram Djafari-Rouhani, Sarry Frederic, Yan Pennec, Bonello Bernard, Beyssen Denis, Paul Charette

In this work, we investigate the sensitivity of a pillar based metasurface in order to understand the behavior of the system in real tests conditions where the mass perturbation will not be homogeneous on all the system. The structure we study is composed in stacking alternate layers of Silica and…

IEEE International Ultrasonics Symposium, IUS 2019, Oct 2019, Glasgow, United Kingdom. pp.844-846, ⟨10.1109/ULTSYM.2019.8925763⟩. ⟨hal-03178711⟩

ART

Synthesis of T-Nb2O5 thin-films deposited by atomic layer deposition for miniaturized electrochemical energy storage devices

Saliha Ouendi, Cassandra Arico, Florent Blanchard, Jean-Louis Codron, Xavier Wallart, Pierre-Louis Taberna, Pascal Roussel, Laurent Clavier, Patrice Simon, Christophe Lethien

Atomic Layer Deposition has been used to grow 30 to 90 nm-thick amorphous Nb2O5 films onto Pt current collectors deposited on Si wafer. While T-Nb2O5 polymorph is obtained by further annealing at 750 °C, the…

Energy Storage Materials, 2019, 16, pp.581-588. ⟨10.1016/j.ensm.2018.08.022⟩. ⟨hal-02135683⟩

ART

Sensitivity to Dispersion Forces in First-Principles Modeling of Disordered Chalcogenides

Carlo Massobrio, Évelyne Martin, Ziyad Chaker, Mauro Boero, Assil Bouzid, Sébastien Le Roux, Guido Ori

The inclusion of dispersion (van der Waals, vdW) forces in first-principles modeling of disordered chalcogenides is analyzed and critically discussed in view of their impact on the atomic structure. To this purpose we considered the case of glassy GeTe4. We selected a vdW correction (termed vdWG…

Frontiers in Materials. Computational Materials Science section, 2018, 5, ⟨10.3389/fmats.2018.00078⟩. ⟨hal-02312708⟩

THESE

Structures périodiques et désordonnées pour l’absorption des ondes électromagnétiques, Periodic and disordered structures for the absorption of electromagnetics waves

Nicolas Fernez

L’absorption des ondes électromagnétiques est un objectif suscitant beaucoup d’intérêt de nos jours notamment pour les applications en furtivité dans le domaine militaire, mais également dans le domaine civil pour limiter l’exposition aux signaux de communication sans fil et pour préserver l’…, Absorption of electromagnetic power arouses a lot of interest not solely for stealth applications in military domain, but also in civil life to reduce the exposure to wireless communication signals and to preserve the totality of exchanged information. Absorbers designing for low frequency domain…

Micro et nanotechnologies/Microélectronique. Université de Lille, 2018. Français. ⟨NNT : 2018LILUI081⟩. ⟨tel-03621958⟩

THESE

Étude par microscopie à sonde locale des propriétés électriques de monocouches auto-assemblées de molécules photo-commutables sur substrats ferromagnétiques, C-AFM study of photoswitchable Self-Assembled Monolayers on ferromagnetic substrates

Louis Thomas

Ce manuscrit traite du transport à travers des monocouches auto-assemblées (self-assembled monolayers, SAMs) de molécules photoisomérisables greffées sur des matériaux ferromagnétiques (FMs) pour des applications à la frontière de l'électronique moléculaire et de la spintronique. Ces systèmes…, This thesis focuses on electrical transport through self-assembled monolayers (SAMs) of photoisomerisable compounds grafted on ferromagnetic materials (FMs) for applications at the frontier between molecular electronics and spintronics. These systems have been characterized by conductive atomic…

Micro et nanotechnologies/Microélectronique. Université de Lille, 2018. Français. ⟨NNT : 2018LILUI086⟩. ⟨tel-02771798v2⟩

ART

THz-TDS time-trace analysis for the extraction of material and metamaterial parameters

Romain Peretti, Sergey Mitryukovskiy, Kevin Froberger, Aniss Mebarki, Sophie Eliet Eliet-Barois, Mathias Vanwolleghem, Jean-Francois Lampin

We report on a method and an associated open source software, Fit@TDS, working on an average personal computer. The method is based on the fitting of a time-trace data of a terahertz time-domain-spectroscopy system enabling the retrieval of the refractive index of a dielectric sample and the…

IEEE Transactions on Terahertz Science and Technology, 2018, 9 (2), ⟨10.1109/TTHZ.2018.2889227⟩. ⟨hal-01903521v6⟩

THESE

Caractérisation hyperfréquence sous pointes de nano-dispositifs : métrologie et instrumentation, On-wafer microwave characterization of nano-devices : metrology and instrumentation

Khadim Daffé

Dans un contexte de développement spectaculaire des nano-objets, il est nécessaire de développer des moyens de caractérisation électrique haute fréquence sous pointes adaptés aux petites échelles. En particulier, deux verrous instrumentaux doivent être levés. D’une part, la principale difficulté…, In the frame of the spectacular development of nano-objects, innovative on-wafer electrical measurement methods must be addressed at the nanoscale. In particular, two main issues have been identified. On one hand, nano-devices exhibit very high dynamic impedance in contrast with conventional…

Micro et nanotechnologies/Microélectronique. Université de Lille, 2018. Français. ⟨NNT : 2018LILUI080⟩. ⟨tel-03611248⟩