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

J. I. Park, J. Cheon

Research output: Contribution to journalArticle

335 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 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.

Original languageEnglish
Pages (from-to)5743-5746
Number of pages4
JournalJournal of the American Chemical Society
Volume123
Issue number24
DOIs
Publication statusPublished - 2001 Oct 9

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Cobalt
Platinum
Nanoparticles
Solid solutions
Oxidation-Reduction
Redox reactions
SQUIDs
Reducing Agents
Byproducts
Structural properties
Energy dispersive spectroscopy
Magnetic properties
Metals
Transmission electron microscopy
Chemical analysis

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

Cite this

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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.",
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Synthesis of "solid solution" and "core-shell" type cobalt-platinum magnetic nanoparticles via transmetalation reactions. / Park, J. I.; Cheon, J.

In: Journal of the American Chemical Society, Vol. 123, No. 24, 09.10.2001, p. 5743-5746.

Research output: Contribution to journalArticle

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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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