A5055443423- Gold and Silver Nanoparticles Synthesis and Applications
- Nanocluster Synthesis and Applications
- Quantum Dots Synthesis And Properties
- Laser-Ablation Synthesis of Nanoparticles
- Catalytic Cross-Coupling Reactions
- N-Heterocyclic Carbenes in Organic and Inorganic Chemistry
- Mass Spectrometry Techniques and Applications
- Analytical chemistry methods development
- Plasmonic and Surface Plasmon Research
- Spectroscopy Techniques in Biomedical and Chemical Research
- Advanced Fluorescence Microscopy Techniques
- Pickering emulsions and particle stabilization
- Analytical Chemistry and Chromatography
- Nanoparticles: synthesis and applications
- Semiconductor materials and devices
- Ion-surface interactions and analysis
- Proteins in Food Systems
- Nanomaterials for catalytic reactions
- Surfactants and Colloidal Systems
- MXene and MAX Phase Materials
Sorbonne Université
2013-2015
Centre National de la Recherche Scientifique
2013-2015
Molécule aux Nanos-objets : Réactivité, Interactions et Spectroscopies
2014-2015
Imperial College London
2011
University of Liverpool
2006-2009
Engineering and Physical Sciences Research Council
2006
National Institute for Biotechnology and Genetic Engineering
2006
Chinese Academy of Sciences
2006
Changchun Institute of Applied Chemistry
2006
A new methodology is described for the one-step aqueous preparation of highly monodisperse gold nanoparticles with diameters below 5 nm using thioether- and thiol-functionalized polymer ligands. The particle size distribution was controlled by subtle variation structure. It shown that poly(acrylic acid) (PAA) poly(methacrylic (PMAA) were most effective stabilizing polymers in group studied relatively low molar mass ligands (approximately 2500 g/mol) gave rise to narrowest distributions....
The synthesis of fluorescent water-soluble gold nanoparticles by the reduction a salt in presence designed polymer ligand is described, size and fluorescence particles being controlled to ratio; most nanomaterial has 3% quantum yield, 1.1 nm core 6.9 hydrodynamic radius.
Synthesizing stable Au and Ag nanocrystals of narrow size distribution from metal-N-heterocyclic carbene (NHC) complexes remains a challenge, particularly in the case when NHC ligands with no surfactant-like properties are used. The formation by one-phase reduction metal-NHCs (metal = Au, Ag) bearing common ligands, namely 1,3-diethylbenzimidazol-2-ylidene (L(1)), 1,3-bis(mesityl)imidazol-2-ylidene (L(2)), 1,3-bis(2,6-(i)Pr2C6H3)imidazol-2-ylidene (L(3)), is presented herein. We show that...
The surface chemistry in colloidal nanocrystals on the final crystalline structure of binary superlattices produced by self-assembly two sets is hereby demonstrated. By mixing having different sizes and same coating agent, oleylamine (OAM), nanocrystal that are produced, such as NaCl, AlB2, NaZn13, MgZn2, well agreement with structures predicted hard-sphere model, their formation being purely driven entropic forces. opposition, when large small coated ligands [OAM dodecanethiol (DDT),...
Fluorescence correlation spectroscopy (FCS) is a popular technique, complementary to cell imaging for the investigation of dynamic processes in living cells. Based on fluorescence, this single molecule method suffers from artifacts originating poor fluorophore photophysics: photobleaching, blinking, and saturation. To circumvent these limitations we present here new called photothermal absorption (PhACS) which relies properties tiny nano-objects. PhACS based heterodyne detection technique...
Au nanocrystals coated with thiol derivatives differing by the length of their alkyl chains are used to build 3D superlattices called supracrystals. In this study, we two sets sizes and size distributions. The average 5 nm (Au5) 7 (Au7). From one experiment other, distribution slightly changes. For Au5 nanocrystals, it evolves from 6 8%, for Au7 varies 6%. (Au5 Au7) first dispersed in toluene produce fcc supracrystals solvent evaporation. Here, small-angle grazing X-ray diffraction, observe...
Silver nanocrystals (NCs) stabilized using amine-terminated coating agents (oleylamine or dodecylamine), their size ranging between 2 and 12 nm in diameter, are synthesized by hot injection methods. Their dispersion is relatively low (typically below 10%) without the need for a postsynthesis segregation process. The replaced thiol-terminated molecules (dodecanethiol hexadecanethiol) ligand exchange, allowing formation of alkanethiol coated Ag colloids. All NCs with various surface coatings...
Silver nanocrystals differing in coating agent and size self-assembled into thin supracrystalline films. The surface plasmon resonance (SPR) properties of these assemblies are presented herein. Nanocrystal size, interparticle distance, play key roles the plasmonic coupling Ag within supracrystals. Here, we demonstrate experimentally that predictions for 2D self-assemblies remains valid 3D superlattices. absorption spectra visible range were found to be markedly dependent on incidence light...
Solvent–ligand interactions in colloidal nanocrystals are of significant importance as they can be used to modulate the way pack into superlattices. Here, we demonstrate that crystal structures nanocrystal superlattices made 2.2 nm Ag controlled by using different carrier solvents. Specifically, superlattice tuned from body-centered cubic (bcc) face-centered (fcc) when varying solvents hexane tetrachloroethylene (TCE). Furthermore, simultaneously annealing these two samples at temperatures,...
The stability of Au nanocrystals (NCs) coated with different N-heterocyclic carbenes (NHCs) or dodecanethiol (DDT) to oxygen-based treatments was investigated. A dominant effect the ligand type observed a significantly greater oxygen resistance NHC-coated NCs compared that thiol-based analogues. are stable 10 W plasma etching for up 180 s whereas integrity DDT-coated is strongly affected by same treatment from 60–80 s. In latter case, average size (from 2.6 6.3 nm) and method synthesis have...
We evaluated several aqueous-based sample preparation protocols for the analysis of poly(methacrylic acid) (PMAA) by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOFMS). The contained a pentaerythritol tetra(3-mercaptopropionate) end-group, and was characterized in positive negative ion modes using 2,5-dihydroxybenzoic acid (DHB) 2,4,6-trihydroxyacetophenone (THAP) matrices. major series observed were [M + Na]+ species, mode, − H]− mode. performance DHB...
Branched copolymer stabilized emulsion droplets can be used as templates for the production of surface-functionalized colloidal particles. The pre-defined pH-responsive surface functionality control solution behavior these colloids—from highly disperse to aggregated. colloids co-encapsulate various hydrophobic molecules and assembled into large site-isolated 3D aggregates with internal macroporosities dictated by method dehydration employed. rehydrated remain stable in acidic water but...
Au nanocrystals coated with thiol derivatives of varying chain sizes ranging from C12 to C16 were produced; two different size have been synthesized (5 and 7 nm in diameter) for each coating agent. All those specimens are characterized by a low distribution (below 7%). Those used as building blocks grow larger self-assembled crystalline structures or supracrystals. These growths carried out slow controlled solvent evaporation at temperatures under non-null partial vapor pressure (Pt). We...