Shape Evolution of Single-Crystalline Iron Oxide Nanocrystals

Jinwoo Cheon, Nam Jung Kang, Sang Min Lee, Jae Hyun Lee, Ji Hyun Yoon, Sang Jun Oh

Research output: Contribution to journalArticle

281 Citations (Scopus)

Abstract

Shape- and size-controlled synthesis of single-crystalline maghemite (γ-Fe2O3) nanocrystals are performed by utilizing a solution-based one-step thermolysis method. Modulating the growth parameters, such as the type and amount of capping ligands as well as the growth time, is shown to have a significant effect on the overall shape and size of the obtained nanocrystals and on the ripening process itself. The resulting shapes of the novel structures are diverse, including slightly faceted spheres, diamonds, prisms, and hexagons, all of which are in fact truncated dodecahedron structures with different degrees of truncation along the {111}, {110}, or {100} faces. Spherical nanocrystals are easily assembled into the three-dimensional superlattices, demonstrating the uniformity of these nanocrystals. The size-dependent magnetic properties are examined, and large hexagon-shaped γ-Fe2O3 nanocrystals are shown to be ferrimagnetic at room temperature.

Original languageEnglish
Pages (from-to)1950-1951
Number of pages2
JournalJournal of the American Chemical Society
Volume126
Issue number7
DOIs
Publication statusPublished - 2004 Feb 25

All Science Journal Classification (ASJC) codes

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

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