Self-assembly and self-orientation of truncated octahedral magnetite nanocrystals

Rongkun Zheng*, Hongwei Gu, Bing Xu, Kwok K. Fung, Xixiang Zhang, Simon P. Ringer

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

70 Scopus citations

Abstract

The superlattices of monodisperse magnetite (Fe3O4) nanoparticles that have a truncated octahedral shape that plays an important role in their self-assembly was studied. High-resolution transmission electron microscopy (HRTEM) images were obtained at the main zone axes of the nanoparticles to determine the characteristics of individual magnetite nanoparticles. Fast Fourier transform (FFT) patterns of lattices was used to identify the orientation, which revealed that the superlattice should have a body-centered cubic (bcc) structure, different from the usually observed face-centered cubic (fcc) structure. Electron diffraction patterns showed displayed the diffraction spots coming from a single crystal rather than the diffraction ring from a polycrystal. The results of the study show that the synthesized magnetite nanoparticles have the shape of Wigner-Seitz crystals, and they assemble by themselves to form a bcc-structured superlattice.

Original languageEnglish (US)
Pages (from-to)2418-2421
Number of pages4
JournalAdvanced Materials
Volume18
Issue number18
DOIs
StatePublished - Sep 18 2006

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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