Nanoscale Bimetallic CoxPt1-x Particles Dispersed in Poly(vinylpyrrolidone): Synthesis from Organometallic Precursors and Characterization

Ould‐Ely, Teyeb; Pan, Cheng; Amiens, Catherine; Chaudret, Bruno; Dassenoy, Fabrice; Lecante, Pierre; Casanove, Marie‐José; Mosset, A.; Respaud, Marc; Broto, J.M.

doi:10.1021/jp9924427

Cited by 142 publications

(80 citation statements)

References 37 publications

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“…The structure of pure cobalt particles with same size and synthesized by the same chemical route has already been proposed as a well-defined polytetrahedral arrangement. 5 Alloying with rhodium, as alloying with platinum that we studied in a previous work, 9 seems to introduce structural disorder in the Co-rich particles, at least at the surface, which impedes their unambiguous structural determination.…”

Section: Introductionmentioning

confidence: 97%

Structural study of bimetallicCoxRh1−xnanoparticles: Size and composition effects

et al. 2004

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The structure of ultrafine bimetallic Co x Rh 1−x nanoparticles synthesized in mild conditions by codecomposition of organometallic precursors in the presence of a polymer or a ligand has been studied using highresolution electron microscopy and wide-angle x-ray scattering techniques. While pure rhodium particles exhibit the main structural features of a face centered cubic (fcc), alloying with cobalt induces a progressive loss of periodicities, leading in high-cobalt-content particles to a polytetrahedral structure close to the one already encountered in pure-cobalt particles. When increasing the synthesis temperature, the polytetrahedral structure remains remarkably stable, while particles with higher rhodium content clearly evolve towards perfect fcc. Increasing the size of the particles up to 5 -6 nm stabilizes the structural phases encountered in the phase diagram of the bulk alloy. Different element-sensitive techniques, x-ray absorption spectroscopy (XANES and EXAFS) and energy-filtering transmission electron microscopy, have also been implemented in order to get chemical information. Evidence is given for a cobalt surface segregation in these bimetallic particles, highly favorable for magnetic-moment enhancement.

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Section: Introductionmentioning

confidence: 97%

Structural study of bimetallicCoxRh1−xnanoparticles: Size and composition effects

et al. 2004

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“…[1][2][3] Poly(N-vinyl-2-pyrrolidone) (PVP) is widely used as stabilizers in preparation of metal and bimetal nanoparticles, such as platinum, 4 copper, 5 palladium, 6 copper/palladium, 7 gold/palladium, 8 cobalt/platinum. 9 PVP plays a very important role in the formation of metal nanoparticles. The interaction between each unit of PVP and metal nanoparticles is very weak, but the collective interaction occurs simultaneously at a whole PVP molecular frame with a lot of active groups.…”

Section: Introductionmentioning

confidence: 99%

Thermal decomposition behaviors of PVP coated on platinum nanoparticles

Du¹,

Yang²,

Mou³

et al. 2005

J of Applied Polymer Sci

221

129

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TG-DTA, TEM, and IR were used to investigate the thermal decomposition behavior of poly(N-vinyl-2-pyrrolidone) (PVP). The TG-DTA results show that the thermal decomposition behavior of PVP on platinum (Pt) is quite different from that of pure PVP. For pure PVP, 95.25% is decomposed when the temperature is increased up to 500°C; while under the same experimental condition, PVP coated on the Pt nanoparticles is only 66.7% decomposed. This is further supported by IR measurement. TEM results exhibited that the partially decomposed PVP still plays a role in stabilizing Pt nanoparticles: after heating treatment at 500°C for half an hour, the platinum nanoparticles did not aggregate heavily.

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“…Thus Co-Pt, Co-Rh and Co-Ru particles [66][67][68] ). As a general rule, nanoparticles of size found between 1.5 and 2.5 nm were obtained whatever the metals and the compositions.…”

Section: Stabilization By Polymersmentioning

confidence: 96%

Organometallic Nanoparticles of Metals or Metal Oxides

Chaudret

Philippot

2007

Oil & Gas Science and Technology - Rev. IFP

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*Dedicated to Yves Chauvin for his exceptional and exemplary contribution to organometallic chemistry and catalysis Ce manuscrit est dédié à Yves Chauvin pour sa contribution exceptionnelle et exemplaire à la chimie organométallique et à la catalyse Résumé -Revue sur la synthèse de nanoparticules de métaux et d'oxydes métalliques -Nous présentons dans cet article une revue sur la synthèse de nanoparticules de métaux et d'oxydes métalliques utilisant une approche organométallique et plus précisément des complexes de ligands hydrocarbures comme précurseurs. L'avantage principal de cette approche réside dans la décomposition facile de ces précurseurs qui peut être effectuée dans des conditions douces et qui ne génère aucun polluant potentiel des nanoparticules. Ceci permet le contrôle de la taille, de la forme et de l'état de surface des nanoparticules formées. Les résultats sont présentés par métaux et par mode de stabilisation (polymères, ligands, liquides ioniques). Nous présentons également quelques résultats concernant l'utilisation de cette approche pour la préparation de matériaux hybrides contenant des nanoparticules incluses dans des matrices minérales (membranes d'alumine, silice mésoporeuse). Enfin nous décrivons également une extension de cette approche pour la synthèse directe de nanoparticules en lit fluidisé. Abstract -Organometallic Nanoparticles of Metals or Metal Oxides

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Nanoscale Bimetallic Co_xPt₁_-_x Particles Dispersed in Poly(vinylpyrrolidone): Synthesis from Organometallic Precursors and Characterization

Cited by 142 publications

References 37 publications

Structural study of bimetallicCoxRh1−xnanoparticles: Size and composition effects

Structural study of bimetallicCoxRh1−xnanoparticles: Size and composition effects

Thermal decomposition behaviors of PVP coated on platinum nanoparticles

Organometallic Nanoparticles of Metals or Metal Oxides

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