Properties and photochemistry of valence-induced-Ti3+ enriched (Nb,N)-codoped anatase TiO2 semiconductors

Andrea Folli, Jonathan Z Bloh, Anaïs Lecaplain, Rebecca Walker, Donald E MacPhee

Research output: Contribution to journalLetter

Abstract

Nb and N codoped TiO2s are outstandingly versatile semiconductor oxides. Their high conductivity makes them valid alternatives to commercially available, but very expensive, conductive oxides. They show increased photonic efficiencies compared to the cases of solely Nb or N doped TiO2, when used as visible light sensitised photocatalysts. Furthermore, they are excellent materials for O2 sensors at very low temperature. Despite these remarkable properties, a clear picture of the electronic and optical mechanisms induced by the simultaneous presence of the dopants has just begun to be understood. Using a combination of electron paramagnetic resonance (EPR) spectroscopy, electrochemical impedance spectroscopy (EIS) and optical spectroscopy, we present here novel fundamental insights into the mechanisms responsible for the enhanced conductivity and visible light photochemistry.

Original languageEnglish
Pages (from-to)4849-4853
Number of pages5
JournalPhysical Chemistry Chemical Physics
Volume17
Issue number7
Early online date6 Jan 2015
DOIs
Publication statusPublished - 21 Feb 2015

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Keywords

  • Nb
  • N
  • TiO2 semiconductors
  • electron paramagnetic resonance spectroscopy
  • electrochemical impedance spectroscopy (EIS)

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