One-pot synthesis and characterization of size-controlled bimagnetic FePt-iron oxide heterodimer nanocrystals

Albert Figuerola, Angela Fiore, Riccardo Di Corato, Andrea Falqui, Cinzia Giannini, Edoardo Micotti, Alessandro Lascialfari, Maurizio Corti, Roberto Cingolani, Teresa Pellegrino, Pantaleo Davide Cozzoli, Liberato Manna

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A one-pot, two-step colloidal strategy to prepare bimagnetic hybrid nanocrystals (HNCs), comprising size-tuned fee FePt and inverse spinel cubic iron oxide domains epitaxially arranged in a heterodimer configuration, is described. The HNCs have been synthesized in a unique surfactant environment by temperature-driven sequential reactions, involving the homogeneous nucleation of FePt seeds and the subsequent heterogeneous growth of iron oxide. This self-regulated mechanism offers high versatility in the control of the geometric features of the resulting heterostructures, circumventing the use of more elaborate seeded growth techniques. It has been found that, as a consequence of the exchange coupling between the two materials, the HNCs exhibit tunable single-phase-like magnetic behavior, distinct from that of their individual components. In addition, the potential of the heterodimers as effective contrast agents for magnetic resonance imaging techniques has been examined.

Original languageEnglish
Pages (from-to)1477-1487
Number of pages11
JournalJournal of the American Chemical Society
Issue number4
Publication statusPublished - Jan 30 2008

ASJC Scopus subject areas

  • Chemistry(all)


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