Synthesis, structure, and optical properties of Au-TiO2 composite thin films

Alpana N. Ranade, Christopher Fulton, Jill E. Seebergh, Mark Nichols, Jeffrey Remillard, Michael Graham, Yip Wah Chung

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


Titanium dioxide (TiO2) films with varying concentrations of gold particles were synthesized using pulsed DC magnetron sputtering, with the intent to develop infrared reflecting films for use on cars and planes to reduce solar heat load. Under our deposition conditions, the films are smooth (RMS roughness on the order of 1.0-2.0 nm) and consist of rutile TiO2 with embedded gold. The average gold particle diameter on the sample surface was found to change from 60 to 200 nm as the volume fraction of gold in the films increased from 1.9 to 4.3% (3.5 to 7.9 mol% Au). The maximum reflectance of these films in the infrared region (800-2500 nm) is > 50%, compared with 30% for pure TiO2. The Maxwell-Garnett equation does not model the reflectance data very well, due to the relatively large gold particle size. Instead, by assuming that the contribution of gold particles to the reflectance response is proportional to their projected areal fraction in an effective medium approximation, we were able to fit the observed reflectance data quite well.

Original languageEnglish (US)
Pages (from-to)1490-1494
Number of pages5
JournalThin Solid Films
Issue number5
StatePublished - Dec 30 2010


  • Infrared reflectance
  • Magnetron sputtering
  • Nanoscale gold particles
  • Plasma resonance
  • Titanium dioxide films

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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