Size and composition effects in the structure and properties of polymer-protected bimetallic particles

Marie José Casanove; Pierre Lecante; Marie Claire Fromen; Marc Respaud; David Zitoun; Cheng Pan; Karine Philippot; Catherine Amiens; Bruno Chaudret; Fabrice Dassenoy

Size and composition effects in the structure and properties of polymer-protected bimetallic particles

Marie José Casanove, Pierre Lecante, Marie Claire Fromen, Marc Respaud, David Zitoun, Cheng Pan, Karine Philippot, Catherine Amiens, Bruno Chaudret, Fabrice Dassenoy

Institut national des sciences appliquées de Toulouse

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

We investigate the structural evolution of PtRu and CoRh ultra fine bimetallic particles as a function of their composition in the whole range of stoichiometry. Isolated particles embedded in an organic matrix are synthesized using chemical techniques in mild conditions. Their size, dispersion and structure are analyzed by HRTEM, WAXS and EXAFS techniques. The magnetic behavior of cobalt-based alloys is investigated by SQUID magnetometry. In the PtRu alloys, we demonstrate the role of composition in the structural transition from the face-centered cubic to the hexagonal close packed structure in nanoparticles and detail the mechanism of the transition. We point out the effect of size reduction and core-shell atomic distribution in the structure and the enhanced magnetization in CoRh bimetallic particles.

Original language	English
Pages (from-to)	349-354
Number of pages	6
Journal	Materials Research Society Symposium - Proceedings
Volume	704
State	Published - 2002
Externally published	Yes

Cite this

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abstract = "We investigate the structural evolution of PtRu and CoRh ultra fine bimetallic particles as a function of their composition in the whole range of stoichiometry. Isolated particles embedded in an organic matrix are synthesized using chemical techniques in mild conditions. Their size, dispersion and structure are analyzed by HRTEM, WAXS and EXAFS techniques. The magnetic behavior of cobalt-based alloys is investigated by SQUID magnetometry. In the PtRu alloys, we demonstrate the role of composition in the structural transition from the face-centered cubic to the hexagonal close packed structure in nanoparticles and detail the mechanism of the transition. We point out the effect of size reduction and core-shell atomic distribution in the structure and the enhanced magnetization in CoRh bimetallic particles.",

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AU - Casanove, Marie José

AU - Lecante, Pierre

AU - Fromen, Marie Claire

AU - Respaud, Marc

AU - Zitoun, David

AU - Pan, Cheng

AU - Philippot, Karine

AU - Amiens, Catherine

AU - Chaudret, Bruno

AU - Dassenoy, Fabrice

PY - 2002

Y1 - 2002

N2 - We investigate the structural evolution of PtRu and CoRh ultra fine bimetallic particles as a function of their composition in the whole range of stoichiometry. Isolated particles embedded in an organic matrix are synthesized using chemical techniques in mild conditions. Their size, dispersion and structure are analyzed by HRTEM, WAXS and EXAFS techniques. The magnetic behavior of cobalt-based alloys is investigated by SQUID magnetometry. In the PtRu alloys, we demonstrate the role of composition in the structural transition from the face-centered cubic to the hexagonal close packed structure in nanoparticles and detail the mechanism of the transition. We point out the effect of size reduction and core-shell atomic distribution in the structure and the enhanced magnetization in CoRh bimetallic particles.

AB - We investigate the structural evolution of PtRu and CoRh ultra fine bimetallic particles as a function of their composition in the whole range of stoichiometry. Isolated particles embedded in an organic matrix are synthesized using chemical techniques in mild conditions. Their size, dispersion and structure are analyzed by HRTEM, WAXS and EXAFS techniques. The magnetic behavior of cobalt-based alloys is investigated by SQUID magnetometry. In the PtRu alloys, we demonstrate the role of composition in the structural transition from the face-centered cubic to the hexagonal close packed structure in nanoparticles and detail the mechanism of the transition. We point out the effect of size reduction and core-shell atomic distribution in the structure and the enhanced magnetization in CoRh bimetallic particles.

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SN - 0272-9172

VL - 704

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EP - 354

JO - Materials Research Society Symposium - Proceedings

JF - Materials Research Society Symposium - Proceedings

ER -

Size and composition effects in the structure and properties of polymer-protected bimetallic particles

Abstract

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