One-pot synthesis of hollow superparamagnetic CoPt nanospheres

Yolanda Vasquez, Amandeep K. Sra, Raymond Edward Schaak

Research output: Contribution to journalArticle

258 Citations (Scopus)

Abstract

Hollow metal nanospheres are of interest for a variety of academic and technological applications, including drug delivery, catalysis, plasmonics, and lightweight structural composites. Despite recent advances in synthesizing metal nanostructures with controlled morphologies, there are very few reports of hollow bimetallic nanospheres, although such systems promise to offer advantages over single-metal systems. Here, were report a one-pot synthetic strategy for accessing hollow CoPt nanospheres with a Co-Pt alloy structure. The approach utilizes an in situ Co template and exploits galvanic displacement reactions to selectively dissolve the Co core while depositing a Pt shell. The combination of reducing conditions and a polymer stabilizer appears to allow the Co and Pt to co-reduce and form a Co-Pt fcc alloy phase with a morphology that is templated by the sacrificial Co core. The hollow CoPt nanospheres, which show magnetic hysteresis at low temperatures, are thermally stable up to 300 °C. The approach, which adds to a growing toolbox of reactions that yield morphologically controlled magnetic CoPt and FePt nanomaterials, is likely to be general for a variety of alloy systems.

Original languageEnglish (US)
Pages (from-to)12504-12505
Number of pages2
JournalJournal of the American Chemical Society
Volume127
Issue number36
DOIs
StatePublished - Sep 14 2005

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Nanospheres
Nanostructures
Metals
Magnetic hysteresis
Catalysis
Drug delivery
Nanostructured materials
Polymers
Temperature
Composite materials
Pharmaceutical Preparations

All Science Journal Classification (ASJC) codes

  • Chemistry(all)

Cite this

Vasquez, Yolanda ; Sra, Amandeep K. ; Schaak, Raymond Edward. / One-pot synthesis of hollow superparamagnetic CoPt nanospheres. In: Journal of the American Chemical Society. 2005 ; Vol. 127, No. 36. pp. 12504-12505.
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One-pot synthesis of hollow superparamagnetic CoPt nanospheres. / Vasquez, Yolanda; Sra, Amandeep K.; Schaak, Raymond Edward.

In: Journal of the American Chemical Society, Vol. 127, No. 36, 14.09.2005, p. 12504-12505.

Research output: Contribution to journalArticle

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