Article Title

Fe₃O₄ octahedral colloidal crystals

Authors

L-r Meng, State Key Laboratory of New Ceramics and Fine Processing, Department of Chemistry and Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
Weimeng Chen, Department of Physics, Peking University, Beijing 100871, China
Yiwei Tan, State Key Laboratory of New Ceramics and Fine Processing, Department of Chemistry and Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
Lin Zou, State Key Laboratory of New Ceramics and Fine Processing, Department of Chemistry and Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
Chinping Chen, Department of Physics, Peking University, Beijing 100871, China
Heping Zhou, State Key Laboratory of New Ceramics and Fine Processing, Department of Chemistry and Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
Qing Peng, State Key Laboratory of New Ceramics and Fine Processing, Department of Chemistry and Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
Yadong Li, State Key Laboratory of New Ceramics and Fine Processing, Department of Chemistry and Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

Keywords

Fe3O4, self-assembly, superlattice, magnetic mesoporous material, electrode material, Verwey transition

Abstract

ABSTRACT We present a facile and controllable method for the large-scale fabrication of highly-ordered octahedral Fe3O4 colloidal “single crystals” without the assistance of a substrate. Oleic acid is used to reduce the solubility of the nano-building blocks in colloidal solution and to induce a “crystallization” process. Our colloidal crystals are of multimicron size and show typical crystallographic characteristics. They have a very robust structure and can serve as a novel ordered magnetic mesoporous material with a relatively narrow pore size distribution. The sample possesses an extremely high Verwey transition temperature (TV) of 100 K and a high saturation magnetization (MS) of 86 emu/g at 5 K based on its good crystallinity, as well as the interparticle dipolar interaction behavior arising from its unique structure. Electrochemical measurements have demonstrated the excellent capacity of the mesoporous colloidal crystals when used in lithium-ion batteries.

Graphical Abstract

DOI

https://doi.org/10.1007/s12274-010-0091-8

Publisher

Tsinghua University Press

Recommended Citation

L-r Meng,Weimeng Chen,Yiwei Tan,Lin Zou,Chinping Chen,Heping Zhou,Qing Peng,Yadong Li, Fe3O4 octahedral colloidal crystals. NanoRes.2011, 4(4): 370–375