Au-TiO2 nanofilms for enhanced photocatalytic activity

Diaoyu Zhou, Yiming Liu, Wanggang Zhang, Wei Liang, Fuqian Yang

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Au/TiO2 nanofilms are prepared on indium-tin oxide glass using magnetron sputtering. The bilayer nanofilms are heat-treated at 500 °C in air for 2 h. The microstructure evolution of the prepared Au/TiO2 nanofilms is characterized, using scanning electron microscope, energy dispersive spectrometer, and X-ray diffraction. The heat treatment leads to the migration of Au atoms to form Au/TiO2 nanofilms with TiO2 being in anatase phase and the presence of Au films/islands on the surface of the Au/TiO2 nanofilms. The photocatalytic activity of the prepared Au/TiO2 nanofilms in an aqueous solution of methylene blue (MB) is evaluated under the irradiation of visible light. The experimental results show that the photocatalytic activity of the prepared Au/TiO2 nanofilms depends on the loading amount of Au. The rate constant for the photodegradation of the MB compound in the aqueous solutions with pure TiO2 nanofilms is less than those with the prepared Au/TiO2 nanofilms. Such behavior can be likely attributed to the activation of the photo-generated charge carriers and the increase of the electron–hole separation efficiency through localized surface plasmon resonance.

Original languageEnglish
Pages (from-to)490-498
Number of pages9
JournalThin Solid Films
Volume636
DOIs
StatePublished - Aug 31 2017

Bibliographical note

Publisher Copyright:
© 2016

Keywords

  • Gold
  • Magnetron sputtering
  • Photocatalytic property
  • Thin films microstructure
  • Titanium dioxide
  • Visible light

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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