Self-assembly and self-orientation of truncated nano-octahedra of magnetite

TL;DR

This paper reports on the synthesis of monodispersed magnetite nanoparticles that self-assemble into ordered superlattices with aligned crystallographic orientations, highlighting the role of shape in controlling nanoparticle orientation for potential applications.

Contribution

It demonstrates the self-assembly and self-orientation of truncated magnetite nanoparticles into ordered superlattices, emphasizing shape's influence on orientation control.

Findings

Nanoparticles form body-centered cubic superlattice.

Shape critically influences nanoparticle orientation.

Self-assembly can complement lithography techniques.

Abstract

Monodispersed magnetite (Fe3O4) nanoparticles were synthesized. Transmission electron microscopy study shows that the nanoparticles are in the shape of Wagner-Seitz crystals. The magnetite nanoparticles self-assemble into body-centered cubic superlattice, in which the nanoparticles have the same crystallographic orientations. Shape plays a very critical role in controlling the orientation of the nanoparticles in the superlattice. Both the self-assembly and self-orientation of nanoparticles are important for technical applications. This can also act as a complement to conventional lithography techniques.