A5077912444- Lipid Membrane Structure and Behavior
- Spectroscopy and Quantum Chemical Studies
- Force Microscopy Techniques and Applications
- Surfactants and Colloidal Systems
- Electrostatics and Colloid Interactions
- Molecular Junctions and Nanostructures
- nanoparticles nucleation surface interactions
- Gold and Silver Nanoparticles Synthesis and Applications
- Block Copolymer Self-Assembly
- Conducting polymers and applications
- Hemoglobin structure and function
- Organic Electronics and Photovoltaics
- Polydiacetylene-based materials and applications
- Polymer Surface Interaction Studies
- Nanopore and Nanochannel Transport Studies
- Surface Chemistry and Catalysis
- Supramolecular Self-Assembly in Materials
- Advanced Chemical Physics Studies
- Electrochemical Analysis and Applications
- Semiconductor materials and devices
- Nanowire Synthesis and Applications
- Neonatal Respiratory Health Research
- Surface and Thin Film Phenomena
- Analytical Chemistry and Sensors
- Nanoparticle-Based Drug Delivery
Synchrotron soleil
2016-2025
Sorbonne Université
1999-2022
Centre National de la Recherche Scientifique
1993-2022
Institut des NanoSciences de Paris
2005-2022
Université de Bordeaux
2014
Université Paris Cité
2000-2007
CEA Grenoble
2007
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
1997-2007
Université Paris-Sud
2002-2005
Laboratoire de Physique du Rayonnement et de la Lumière
2001-2005
The formation of a nanometer-size oxide pattern on silicon using scanning probe microscope (SPM) has been widely reported in the literature. No analytical model proposed, however, to explain variation height with both polarization and speed SPM tip. In this letter, we quantitatively tip based field induced oxidation. Data analysis also allows us estimate thermal activation energy oxidation process, (∼0.15 eV). This low value is compared energies measured for plasma silicon.
A comparison between scanning tunneling microscope (STM) and atomic force (AFM) nanolithography techniques based on local oxidation of silicon is proposed. This work deals with the three different near-field microscopy techniques, namely, STM, AFM in contact mode (CM-AFM), tapping (TM-AFM), all them operated air. The thickness width oxide stripes are studied as a function applied probe–sample voltage, speed probe setpoint (current, force, vibration amplitude for contact, tapping,...
In order to fabricate metal-insulator-semiconductor (MIS) devices with gate insulating films thinner than 5.0 nm, organic monolayers have been grafted on the native oxide layer of silicon wafers. We demonstrate that a single monolayer octadecyltrichlorosilane 2.8 nm thickness allows based MIS device current density as low 10−8 A/cm2 at 5.8 MV/cm, insulator charge lower 1010 cm−2, fast interface state 1011 cm−2 eV−1, and dielectric breakdown field high 12 MV/cm. Moreover, this film is...
Abstract Interfaces in perovskite solar cells (PSCs) play a pivotal role determining device performance by influencing charge transport and recombination. Understanding the physical processes at these interfaces is essential for achieving high‐power conversion efficiency PSCs. Particularly, involving oxide‐based layers are susceptible to defects like dangling bonds, excess oxygen, or oxygen deficiency. To address this issue, surface of NiO x passivated using octadecylphosphonic acid (ODPA),...
Processes of water condensation and desublimation on solid surfaces are ubiquitous in nature essential for various industrial applications, which crucial their performance. Despite significance, these processes not well understood due to the lack methods that can provide insight at nanolevel into very first stages phase transitions. Taking advantage synchrotron grazing-incidence wide-angle X-ray scattering (GIWAXS) environmental scanning electron microscopy (ESEM), two pathways frosting...
There is currently a large research activity on the development of devices based diacetylene (DA). Interfacing DA films with metallic substrate appears to be very interesting for applications. In order create layer anchored below monolayer, radiolysis synthesis was carried out using grazing incident X-ray diffraction (GIXD) experiment. An beam intercepts surface an aqueous metallic-ion subphase covered by molecular film at angle incidence critical total internal reflection. The irradiation...
We report the first direct evidence for formation of circular surface micelles (hemimicelles) on water. These highly monodisperse 30 nm hemimicelles, made from a semifluorinated alkane deposited as Langmuir monolayer, form organized hexagonal arrays determined by small-angle X-ray diffraction conducted directly water at grazing incidence.
The SIRIUS beamline of Synchrotron SOLEIL is dedicated to X-ray scattering and spectroscopy surfaces interfaces, covering the tender mid-hard range (1.1-13 keV). has hosted a wide experiments in field soft interfaces beyond, providing various grazing-incidence techniques such as diffraction wide-angle (GIXD/GIWAXS), small-angle (GISAXS) fluorescence total reflection (TXRF). also offers specific sample environments tailored for situ complementary on solid liquid surfaces. Recently, added...
Metal-organic framework (MOF) activation is crucial for the use of MOFs in several applications and solvent-exchange process a necessary step many methods. In this contribution, we have explored situ MOF monolayer film formation at air-water interface. Nanoparticles (NPs) Al trimesate MIL-96(Al) retain chloroform into their micropores, which considerably diminishes CO2 adsorption capacity films. However, between water increases by 30%. Total Reflection X-Ray Fluorescence (TRXF) allows...
Compression of mixed Langmuir monolayers made from combinations dipalmitoyl phosphatidylethanolamine (DPPE) and the semi-fluorinated alkane C8F17C16H33 (F8H16) results in expulsion diblock molecule at high pressure. Depending on DPPE/F8H16 molar ratio, either a monolayer or bilayer F8H16 is formed top DPPE-only monolayer. The structure hydrocarbon fluorocarbon layers that constitute resulting vertically separated bi- trilayer was determined using grazing incidence X-ray diffraction....
In this study, we have characterized graphene oxide films formed at the air–water interface by X-ray reflectivity and grazing incidence diffraction using synchrotron sources.
Selective interactions of ions with charge-neutral saccharides can have far-reaching consequences in biological and wet-technological contexts but so far been observed only indirectly. Here, we directly quantify by total-reflection X-ray fluorescence the preferential accumulation near uncharged saccharide surfaces form glycolipid Langmuir monolayers at air/water interfaces exhibiting different levels structural ordering. from aqueous subphase are for featuring crystalline ordering...
Abstract The water surface provides a highly effective platform for the synthesis of two-dimensional polymers (2DP). In this study, we present an efficient on-water crystalline monolayer 2D polyimide (2DPI) through imidization reaction between tetra (4-aminophenyl) porphyrin (M1) and perylenetracarboxylic dianhydride (M2), resulting in excellent stability coverage over large area (tens cm 2 ). We further fabricate innovative organic-inorganic hybrid van der Waals heterostructures (vdWHs) by...
We have determined the structure formed at air-water interface by semifluorinated alkanes (C(8)F(17)C(m)H(2m+1) diblocks, F8Hm for short) different lengths of molecule (m = 14, 16, 18, 20) using surface pressure versus area per isotherms, Brewster angle microscopy (BAM), and grazing incidence x-ray experiments (GISAXS GIXD). The behavior monolayers diblocks under compression is mainly characterized a phase transition from low-density to condensed phase. nonzero crystalline exhibits two...
Additives are frequently used to enhance material properties. The addition of the processing additive 5‐aminovaleric acid iodide (5‐AVAI) into printed mesoscopic perovskite solar cells is shown have a strong impact on device performance and stability. Although it difficult understand 5‐AVAI as by examining only final thin films, evolution morphology with without reveals that influences crystallization behavior perovskite. In situ grazing incidence wide angle X‐ray scattering (GIWAXS)...
Cell membranes constitute the first barrier for drugs on their way to cell. Therefore, penetration determines effectivity of treatment and is defined by drug-lipid interactions. A systematic, comprehensive study assess impact different aspects influencing effective model lipid including lipophilicity, charge, ability form dimers as well stearic hindrance was performed. Four anthracyclines differing in structure with lipophilicity increasing following order: doxorubicin (DOx) < pirarubicin...