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

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

doi:10.1002/adma.200600788

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 journal › Article › peer-review

75 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 language	English (US)
Pages (from-to)	2418-2421
Number of pages	4
Journal	Advanced Materials
Volume	18
Issue number	18
DOIs	https://doi.org/10.1002/adma.200600788
State	Published - Sep 18 2006
Externally published	Yes

ASJC Scopus subject areas

General Materials Science
Mechanics of Materials
Mechanical Engineering

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10.1002/adma.200600788

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title = "Self-assembly and self-orientation of truncated octahedral magnetite nanocrystals",

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.",

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T1 - Self-assembly and self-orientation of truncated octahedral magnetite nanocrystals

AU - Zheng, Rongkun

AU - Gu, Hongwei

AU - Xu, Bing

AU - Fung, Kwok K.

AU - Zhang, Xixiang

AU - Ringer, Simon P.

PY - 2006/9/18

Y1 - 2006/9/18

N2 - 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.

AB - 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.

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

Abstract

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