Synthesis of "solid solution" and "core-shell" type cobalt-platinum magnetic nanoparticles via transmetalation reactions

J. I. Park; J. Cheon

doi:10.1021/ja0156340

Synthesis of "solid solution" and "core-shell" type cobalt-platinum magnetic nanoparticles via transmetalation reactions

J. I. Park, J. Cheon

Department of Chemistry

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

343 Citations (Scopus)

Abstract

In this article, we report the synthesis of "solid solution" and "core-shell" types of well-defined Co-Pt nanoalloys smaller than 10 nm. The formation of these alloys is driven by redox transmetalation reactions between the reagents without the need for any additional reductants. Also the reaction proceeds selectively as long as the redox potential between the two metals is favorable. The reaction between Co₂(CO)₈ and Pt(hfac)₂ (hfac = hexafluoroacetylacetonate) results in the formation of "solid solution" type alloys such as Co_corePt₃ nanoparticles. On the other hand, the reaction of Co nanoparticles with Pt(hfac)₂ in solution results in "Co_core-Pt_shell" type nanoalloys. Nanoparticles synthesized by both reactions are moderately monodispersed (σ < 10%) without any further size selection processes. The composition of the alloys can also be tuned by adjusting the ratio of reactants. The magnetic and structural properties of the obtained nanoparticles and reaction byproducts are characterized by TEM, SQUID, UV/vis, IR, EDAX, and XRD.

Original language	English
Pages (from-to)	5743-5746
Number of pages	4
Journal	Journal of the American Chemical Society
Volume	123
Issue number	24
DOIs	https://doi.org/10.1021/ja0156340
Publication status	Published - 2001

All Science Journal Classification (ASJC) codes

Catalysis
Chemistry(all)
Biochemistry
Colloid and Surface Chemistry

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title = "Synthesis of {"}solid solution{"} and {"}core-shell{"} type cobalt-platinum magnetic nanoparticles via transmetalation reactions",

abstract = "In this article, we report the synthesis of {"}solid solution{"} and {"}core-shell{"} types of well-defined Co-Pt nanoalloys smaller than 10 nm. The formation of these alloys is driven by redox transmetalation reactions between the reagents without the need for any additional reductants. Also the reaction proceeds selectively as long as the redox potential between the two metals is favorable. The reaction between Co2(CO)8 and Pt(hfac)2 (hfac = hexafluoroacetylacetonate) results in the formation of {"}solid solution{"} type alloys such as CocorePt3 nanoparticles. On the other hand, the reaction of Co nanoparticles with Pt(hfac)2 in solution results in {"}Cocore-Ptshell{"} type nanoalloys. Nanoparticles synthesized by both reactions are moderately monodispersed (σ < 10%) without any further size selection processes. The composition of the alloys can also be tuned by adjusting the ratio of reactants. The magnetic and structural properties of the obtained nanoparticles and reaction byproducts are characterized by TEM, SQUID, UV/vis, IR, EDAX, and XRD.",

author = "Park, {J. I.} and J. Cheon",

year = "2001",

doi = "10.1021/ja0156340",

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journal = "Journal of the American Chemical Society",

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AU - Park, J. I.

AU - Cheon, J.

PY - 2001

Y1 - 2001

N2 - In this article, we report the synthesis of "solid solution" and "core-shell" types of well-defined Co-Pt nanoalloys smaller than 10 nm. The formation of these alloys is driven by redox transmetalation reactions between the reagents without the need for any additional reductants. Also the reaction proceeds selectively as long as the redox potential between the two metals is favorable. The reaction between Co2(CO)8 and Pt(hfac)2 (hfac = hexafluoroacetylacetonate) results in the formation of "solid solution" type alloys such as CocorePt3 nanoparticles. On the other hand, the reaction of Co nanoparticles with Pt(hfac)2 in solution results in "Cocore-Ptshell" type nanoalloys. Nanoparticles synthesized by both reactions are moderately monodispersed (σ < 10%) without any further size selection processes. The composition of the alloys can also be tuned by adjusting the ratio of reactants. The magnetic and structural properties of the obtained nanoparticles and reaction byproducts are characterized by TEM, SQUID, UV/vis, IR, EDAX, and XRD.

AB - In this article, we report the synthesis of "solid solution" and "core-shell" types of well-defined Co-Pt nanoalloys smaller than 10 nm. The formation of these alloys is driven by redox transmetalation reactions between the reagents without the need for any additional reductants. Also the reaction proceeds selectively as long as the redox potential between the two metals is favorable. The reaction between Co2(CO)8 and Pt(hfac)2 (hfac = hexafluoroacetylacetonate) results in the formation of "solid solution" type alloys such as CocorePt3 nanoparticles. On the other hand, the reaction of Co nanoparticles with Pt(hfac)2 in solution results in "Cocore-Ptshell" type nanoalloys. Nanoparticles synthesized by both reactions are moderately monodispersed (σ < 10%) without any further size selection processes. The composition of the alloys can also be tuned by adjusting the ratio of reactants. The magnetic and structural properties of the obtained nanoparticles and reaction byproducts are characterized by TEM, SQUID, UV/vis, IR, EDAX, and XRD.

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Synthesis of "solid solution" and "core-shell" type cobalt-platinum magnetic nanoparticles via transmetalation reactions

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