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 language||English (US)|
|Number of pages||4|
|State||Published - Sep 18 2006|
ASJC Scopus subject areas
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering