A5038251855- Carbon Nanotubes in Composites
- Graphene research and applications
- Diamond and Carbon-based Materials Research
- Boron and Carbon Nanomaterials Research
- Fullerene Chemistry and Applications
- 2D Materials and Applications
- MXene and MAX Phase Materials
- Semiconductor materials and devices
- Mechanical and Optical Resonators
- Force Microscopy Techniques and Applications
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Metal and Thin Film Mechanics
- Molecular Junctions and Nanostructures
- Supercapacitor Materials and Fabrication
- Nanotechnology research and applications
- Hydrogen Storage and Materials
- Surface Modification and Superhydrophobicity
- Nanopore and Nanochannel Transport Studies
- Advanced ceramic materials synthesis
- Metal-Organic Frameworks: Synthesis and Applications
- Gas Sensing Nanomaterials and Sensors
- Electron and X-Ray Spectroscopy Techniques
- Advanced Electron Microscopy Techniques and Applications
- Thermal properties of materials
Centre National de la Recherche Scientifique
2016-2025
Université Claude Bernard Lyon 1
2016-2025
Laboratoire des Multimatériaux et Interfaces
2012-2024
Université Paris-Saclay
2019
Laboratoire Ingénierie, Procédés, Aliments
2019
Université de Lyon
2015
Rice University
2009
Laboratoire de physique de la matière condensée
2007-2009
Laboratoire de Physique Théorique de la Matière Condensée
2007
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2006
A simple method was used to assemble single-walled carbon nanotubes into indefinitely long ribbons and fibers. The processing consists of dispersing the in surfactant solutions, recondensing flow a polymer solution form nanotube mesh, then collating this mesh fiber. Flow-induced alignment may lead preferential orientation that has ribbon. Unlike classical fibers, fibers can be strongly bent without breaking. Their obtained elastic modulus is 10 times higher than high-quality bucky paper.
We present in this Letter an experimental characterization of liquid flow slippage over superhydrophobic surfaces made carbon nanotube forests, incorporated microchannels. make use a particle image velocimetry technique to achieve the submicrometric resolution on profile necessary for accurate measurement surface hydrodynamic properties. demonstrate boundary Cassie state, associated with slip lengths few microns, while vanishing length is found Wenzel state when impregnates surface. Varying...
Proximity-induced superconductivity in single-walled carbon nanotubes below 1 kelvin, both a single tube nanometer diameter and crystalline ropes containing about 100 nanotubes, was observed. The samples were suspended between two superconducting electrodes, permitting structural study transmission electron microscope. When the resistance of nanotube junction is sufficiently low, it becomes can carry high supercurrents. temperature magnetic field dependence critical current such junctions...
The catalytic growth of single-wall carbon nanotubes is investigated by high-resolution transmission electron microscopy. similarities between the samples synthesized from different techniques suggest a common mechanism based on vapor-liquid-solid model. Quantum-molecular-dynamics simulations support root where atoms are incorporated into tube base diffusion-segregation process.
Field emission (FE) electron spectroscopy from an individual multiwalled carbon nanotube (MWNT) is used to measure quantitatively stable temperatures at the apex, T(A), of up 2000 K induced by FE currents approximately 1 microA. The high T(A) due Joule heating along length MWNT. These measurements also give directly resistance MWNT which shown decrease with temperature, and explain phenomenon FE-induced light was observed simultaneously. permits thermal desorption and, hence, excellent...
In view of the extensive use hexagonal boron nitride (hBN) in 2D material electronics, it becomes important to refine its dielectric characterization terms low-field permittivity and high-field strength conductivity up breakdown voltage. The present study aims at filling this gap using DC RF transport two Au-hBN-Au capacitor series variable thickness 10--100 nm range, made large high-pressure, high-temperature (HPHT) crystals a polymer derivative ceramics (PDC) crystals. We deduce an...
Abstract In this study, a reversible pressure‐sensing material with high sensitivity is presented. Mixed β‐diketonate complexes of Tb 3+ and Eu [(Ln)(acac) 3 phen] are synthesized phenanthroline as an ancillary ligand. The organic ligands provide the antenna effect to make Ln complex excitable at 405 nm. emission results from efficient energy transfer (ET) . Under nm excitation, intensity decreases whereas increases pressure, making potential pressure sensor based on...
In this paper the effect of pressure on contact angle a water drop superhydrophobic carbon nanotube (CNT) forests is studied. Superhydrophobic CNT are obtained from new and simple functionalization strategy, based gold-thiol affinity. Using specifically devised experimental setup, we then show that these surfaces able to withstand high excess pressures (larger than 10 kPa) without transiting toward roughness-invaded state, therefore preserving their low adhesion properties. Together with...
We show here that field emission (FE) can be used to directly observe the vibration resonances ${\ensuremath{\nu}}_{R}$ of carbon nanotubes (CNTs) and tension created by applied allows tuning these up a factor 10. The are observable changes they create in FE pattern or emitted current. is shown linear voltage follow from basic physics stretched strings. method one study mechanical properties individual multiwall within an ensemble their evolution as CNTs modified. detection should useful for...
We report observations of acoustoelectric effects in carbon nanotubes. excite sound $\ensuremath{\mu}\mathrm{m}$ long ropes single walled nanotubes suspended between two metallic contacts by applying radio-frequency electric field. The is detected measuring either the dc resistance tubes a region strong temperature dependence (in vicinity superconducting or metal-insulator transition), their critical current. show that, depending on excitation power, vibrations produce electron heating phase...
In this paper we simulate the resistive heating of carbon nanotubes (CNT's) during field emission (FE) using one-dimensional heat equation including radiation and conductive losses. The simulations are in relatively good agreement with our recent experiments which measured individual CNT's to as high 2000 K FE for currents ${I}_{\mathrm{FE}}$ $\ensuremath{\approx}2 \ensuremath{\mu}\mathrm{A}.$ For low temperatures where is negligible reduce an analytic solution that provides a universal...
The extraordinary electronic, thermal and mechanical properties of carbon nanotubes (CNTs) closely relate to their structure. They can be seen as rolled-up graphene sheets with electronic depending on how this rolling up is achieved. However, not the way they actually grow. Various methods are used produce nanotubes. all have in common three ingredients: (i) a source, (ii) catalyst nanoparticles (iii) an energy input. In case where source provided solid form, one speaks about 'high...
Following the graphene isolation, strong interest in two dimensional (2D) materials has been driven by their outstanding properties.Their typical intrinsic structure, including in-plane covalent bonding and weak out-of-plane Van der Waals interaction, makes them highly promising diverse areas such as electronics, catalysis, environment.Growth of 2D requires a synthesis approach able to control deposition onto support at atomic scale.Thanks simplicity, versatility ability thickness angstrom...
Given the challenging task of constructing an efficient nitrogen reduction reaction (NRR) electrocatalyst with enhanced ambient condition performance, properties such as high specific surface area, fast electron transfer, and design catalyst constitute a group key factors to be taken into consideration guarantee outstanding catalytic performance durability. Thereof, this work investigates contribution 2D/2D heterojunction interface between MoS2 reduced graphene oxide (rGO) on...
Low-coverage adsorption isotherms for ${\mathrm{CH}}_{4}$ on single-walled carbon nanotube bundles have been measured at eight temperatures between 155 and 195 K. The nanotubes used in this study were untreated, so that the tubes closed ends. isosteric heat of was determined from and, quantity, binding energy methane substrate obtained. found to be 76% larger than it is planar graphite.