Interesting magnetic behavior from reduced titanium dioxide nanobelts

S. V. Chong, K. Kadowaki, J. Xia, Hicham Idriss

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

The magnetic behavior of titanium dioxide nanobelts has been investigated with and without Co doping. Room temperature ferromagnetism was observed when the Co-doped anatase TiO2 nanobelts were prepared via vacuum annealing of 2.5 at. % Co-doped titanate nanobelts, while annealing them in air resulted in paramagnetic ordering. Interestingly, by vacuum annealing the undoped titanate nanobelts under the same conditions, superparamagnetic ordering was observed in the resulting anatase TiO2 nanobelts. The electron paramagnetic resonance of this latter sample shows a strong symmetrical signal at g = 2.003 suggesting some sort of exchange interactions among the localized electrons' spin moments from single electron trapped in oxygen vacancies. (C) 2008 American Institute of Physics.

Original languageEnglish
Number of pages3
JournalApplied Physics Letters
Volume92
Issue number23
DOIs
Publication statusPublished - 9 Jun 2008

Keywords

  • TIO2
  • ferromagnetism
  • nanotubes
  • ESR

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