Interfacial Structure and Photocatalytic Activity of Magnetron Sputtered TiO2 on Conducting Metal Substrates

Svava Daviðsdóttir, Jean-Pierre Petit, Michel Mermoux, Rajashekhara Shabadi, Stela Canulescu, Klaus Pagh Almtoft, Kai Dirscherl, Rajan Ambat

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The photocatalytic behavior of magnetron sputtered anatase TiO2 coatings on copper, nickel, and gold was investigated with the aim of understanding the effect of the metallic substrate and coating-substrate interface structure. Stoichiometry and nanoscale structure of the coating were investigated using X-ray diffraction, Raman spectroscopy, atomic force microscope, and scanning and transmission electron microscopy. Photocatalytic behavior of the coating was explored by using optical spectrophotometry and electrochemical methods via photovoltage, photocurrent, and scanning kelvin probe microscopy measurements. The nature of the metal substrate and coating-substrate interface had profound influence on the photocatalytic behavior. Less photon energy was required for TiO2 excitation on a nickel substrate, whereas TiO2 coating on copper showed a higher band gap attributed to quantum confinement. However, the TiO2 coating on gold exhibited behavior typical of facile transfer of electrons to and from the CB, therefore requiring only a small amount of photon energy to make the TiO2 coating conductive.
Original languageEnglish
JournalA C S Applied Materials and Interfaces
Volume6
Issue number24
Pages (from-to)22224–22234
ISSN1944-8244
DOIs
Publication statusPublished - 2014

Keywords

  • Photocatalytic
  • Anatase
  • Metallic substrate
  • Photoelectrochemistry
  • Photoabsorption
  • Raman spectroscopy

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