Synthesis of vertically aligned manganese-doped Fe3O4 nanowire arrays and their excellent room-temperature gas sensing ability

Seon Oh Hwang, Chang Hyun Kim, Yoon Myung, Seong Hun Park, Jeunghee Park, Joondong Kim, Chang Soo Han, Jae Young Kim

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

Vertically aligned Mn (10%)-doped Fe3O4 (Fe 2.7Mn0.3O4) nanowire arrays were produced by the reduction/substitution of pregrown Fe2O3 nanowires. These nanowires were ferromagnetic with a Verwey temperature of 129 K. X-ray magnetic circular dichroism measurements revealed that the Mn2+ ions preferentially occupy the tetrahedral sites, substituting for the Fe 3+ ions. We observed that the Mn substitution decreases the magnetization, but increases the electrical conductivity. We developed highly sensitive gas sensors using these nanowire arrays, operating at room temperature, whose sensitivity showed a correlation with their bond strength of diatomic/triatomic molecules.

Original languageEnglish
Pages (from-to)13911-13916
Number of pages6
JournalJournal of Physical Chemistry C
Volume112
Issue number36
DOIs
Publication statusPublished - 2008 Sep 11
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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