Synthesis of Ordered Mesoporous Fe3O4 and γ-Fe2O3 with Crystalline Walls using Post-template Reduction/Oxidation

J Feng, J C Jumas, M Womes, A V Chadwick, A Harrison, Peter George Bruce

Research output: Contribution to journalArticlepeer-review

321 Citations (Scopus)

Abstract

Ordered mesoporous Fe3O4 with crystalline walls (inverse spinel structure) has been synthesized for the first time, representing to the best of our knowledge, the first synthesis of a reduced mesoporous iron oxide. Synthesis was achieved by reducing ordered mesoporous alpha-Fe2O3 (corundum structure) to Fe3O4 spinel then to gamma-Fe2O3 by oxidation, while preserving the ordered mesostructure and crystalline walls throughout. Such solid/solid transformations demonstrate the stability of the mesostructure to structural phase transitions from the hexagonal close packed oxide subarray of alpha-Fe2O3 (corundum structure) to the cubic close packed subarray of Fe3O4 spinel and gamma-Fe2O3. Preliminary magnetic measurements reveal that the spins in both Fe3O4 and gamma-Fe2O3 are frozen at 295 K, despite the wall thickness (7 nm) being less than the lower limit for such freezing in corresponding nanoparticles (> 8 nm).

Original languageEnglish
Pages (from-to)12905-12909
Number of pages5
JournalJournal of the American Chemical Society
Volume128
DOIs
Publication statusPublished - 4 Oct 2006

Keywords

  • MESOSTRUCTURED IRON OXYHYDROXIDES
  • THIN-FILMS
  • MAGNETIC-PROPERTIES
  • FACILE SYNTHESIS
  • METAL-OXIDES
  • SILICA
  • TRANSITION
  • NANOPARTICLES
  • ALPHA-FE2O3
  • FRAMEWORKS

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