Redox-transmetalation process as a generalized synthetic strategy for core-shell magnetic nanoparticles

Woo Ram Lee, Min Gyu Kim, Joon Rak Choi, Jong Il Park, Seung Jin Ko, Sang Jun Oh, Jinwoo Cheon

Research output: Contribution to journalArticle

230 Citations (Scopus)

Abstract

Although multicomponent core-shell type nanomaterials are one of the highly desired structural motifs due to their simultaneous multifunctionalities, the fabrication strategy for such nanostructures is still in a primitive stage. Here, we present a redox-transmetalation process that is effective as a general protocol for the fabrication of high quality and well-defined core-shell type bimetallic nanoparticles on the sub-10 nm scale. Various core-shell type nanomaterials including Co@Au, Co@Pd, Co@Pt, and Co@Cu nanoparticles are fabricated via transmetalation reactions. Compared to conventional sequential reduction strategies, this transmetalation process has several advantages for the fabrication of core-shell type nanoparticles: (i) no additional reducing agent is needed and (ii) spontaneous shell layer deposition occurs on top of the core nanoparticle surface and thus prevents self-nucleation of secondarily added metals. We also demonstrate the versatility of these core-shell structures by transferring Co@Au nanoparticles from an organic phase to an aqueous phase via a surface modification process. The nanostructures, magnetic properties, and reaction byproducts of these core-shell nanoparticles are spectroscopically characterized and identified, in part, to confirm the chemical process that promotes the core-shell structure formation.

Original languageEnglish
Pages (from-to)16090-16097
Number of pages8
JournalJournal of the American Chemical Society
Volume127
Issue number46
DOIs
Publication statusPublished - 2005 Nov 23

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Nanoparticles
Oxidation-Reduction
Nanostructures
Nanostructured materials
Fabrication
Chemical Phenomena
Reducing Agents
Reducing agents
Byproducts
Surface treatment
Magnetic properties
Nucleation
Metals

All Science Journal Classification (ASJC) codes

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

Cite this

Lee, Woo Ram ; Kim, Min Gyu ; Choi, Joon Rak ; Park, Jong Il ; Ko, Seung Jin ; Oh, Sang Jun ; Cheon, Jinwoo. / Redox-transmetalation process as a generalized synthetic strategy for core-shell magnetic nanoparticles. In: Journal of the American Chemical Society. 2005 ; Vol. 127, No. 46. pp. 16090-16097.
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Redox-transmetalation process as a generalized synthetic strategy for core-shell magnetic nanoparticles. / Lee, Woo Ram; Kim, Min Gyu; Choi, Joon Rak; Park, Jong Il; Ko, Seung Jin; Oh, Sang Jun; Cheon, Jinwoo.

In: Journal of the American Chemical Society, Vol. 127, No. 46, 23.11.2005, p. 16090-16097.

Research output: Contribution to journalArticle

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