MARRE, Samuel; ERRIGUIBLE, Arnaud; PERDOMO, Arturo; CANSELL, François; MARIAS, Frederic; AYMONIER, Cyril

doi:10.1021/jp809533n

Métadonnées

Afficher la notice complète

Licence d’utilisation du document

MARRE, Samuel
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

ERRIGUIBLE, Arnaud
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

PERDOMO, Arturo
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

Langue

Article de revue

Ce document a été publié dans

Journal of Physical Chemistry C. 2009-03-09, vol. 113, n° 13, p. 5096-5104

American Chemical Society

Résumé en anglais

The formation of surface nanostructures allows assemblies of materials at different scales, opening new routes toward the design of advanced nanostructured materials. The decoration of surfaces with shape- and size-controlled metal nanoparticles can be achieved through the reduction of hexafluoroacetylacetonate complexes [M(hfac)x] with H2 in supercritical CO2/alcohol at low temperature with neither catalyst nor surface prefunctionalization. This paper investigates the influence of different alcohols, methanol, ethanol, and isopropanol, used as cosolvent on the reduction kinetics of Cu(hfac)2·H20 in the supercritical CO2/alcohol/H2 mixtures. The results are applied to the modeling of the decoration process of silica spheres, used as a model substrate, with copper nanoparticles (5−17 nm). The model, using the decomposition kinetics of the precursor, is based on a bimodal process: (i) an initial homogeneous nucleation in the supercritical media and (ii) a fast heterogeneous growth by coalescence on the surface of the silica particles. We demonstrate good agreements between the simulated results and the experimental data showing an advanced kinetically controlled size of the supported nanoparticles in the range of temperature 100−125 °C and residence time 0−120 min.< Réduire

Métadonnées

Licence d’utilisation du document

Kinetically controlled formation of supported nanoparticles in low temperature supercritical media for the development of advanced nanostructured materials

Langue

Ce document a été publié dans

Résumé en anglais

DOI

Origine

Unités de recherche