Research Article

Nano Research

, Volume 4, Issue 4, pp 370-375

Fe3O4 octahedral colloidal crystals

  • L-r MengAffiliated withState Key Laboratory of New Ceramics and Fine Processing, Department of Chemistry and Department of Materials Science and Engineering, Tsinghua University
  • , Weimeng ChenAffiliated withDepartment of Physics, Peking University
  • , Yiwei TanAffiliated withState Key Laboratory of New Ceramics and Fine Processing, Department of Chemistry and Department of Materials Science and Engineering, Tsinghua University
  • , Lin ZouAffiliated withState Key Laboratory of New Ceramics and Fine Processing, Department of Chemistry and Department of Materials Science and Engineering, Tsinghua University
  • , Chinping ChenAffiliated withDepartment of Physics, Peking University
  • , Heping ZhouAffiliated withState Key Laboratory of New Ceramics and Fine Processing, Department of Chemistry and Department of Materials Science and Engineering, Tsinghua University
  • , Qing PengAffiliated withState Key Laboratory of New Ceramics and Fine Processing, Department of Chemistry and Department of Materials Science and Engineering, Tsinghua University
  • , Yadong LiAffiliated withState Key Laboratory of New Ceramics and Fine Processing, Department of Chemistry and Department of Materials Science and Engineering, Tsinghua University Email author 

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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 (T V) of 100 K and a high saturation magnetization (M S) 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.
http://static-content.springer.com/image/art%3A10.1007%2Fs12274-010-0091-8/MediaObjects/12274_2010_91_Fig1_HTML.jpg

Keywords

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