Sol-gel preparation and characterization of Ag-TiO2 nanocomposite thin films

Enrico Traversa, Maria Luisa Di Vona, Patrizia Nunziante, Silvia Licoccia, Takeshi Sasaki, Naoto Koshizaki

Research output: Contribution to journalConference articlepeer-review

54 Scopus citations

Abstract

Ag-TiO2 thin films were prepared with a sol-gel route, using titanium isopropoxide and silver nitrate as precursors, at 0.03 and 0.06 Ag/Ti nominal atomic ratios. After drying at 80°C, the films were fired at 300°C and 500°C for 30 min. The films were analysed by X-ray diffraction (XRD) with glancing angle, and X-ray photoelectron spectroscopy (XPS), with depth profiling of the concentration. XPS analysis showed the presence of C and N as impurities in the nanocomposite films. Their concentration decreased with increasing the firing temperature. Chemical state analysis showed that Ag was present in metallic state, except for the very outer layer where it was present as Ag+. For the films prepared with a Ag/Ti concentration of 0.06, depth profiling measurements of the film fired at 300°C showed a strong Ag enrichment at the outer surface, while composition remained almost constant within the rest of the film, at 0.019. For the films heated to 500°C, two layers were found, where the Ag/Ti ratios were 0.015 near the surface and 0.026 near the substrate.

Original languageEnglish (US)
Pages (from-to)733-736
Number of pages4
JournalJournal of Sol-Gel Science and Technology
Volume19
Issue number1-3
DOIs
StatePublished - Dec 1 2000
Event10th International Workshop pn Glass and Ceramics, Hybrids and Nanocomposites from Gels - Yokohama, Jpn
Duration: Sep 20 1999Sep 24 1999

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Chemistry(all)
  • Biomaterials
  • Condensed Matter Physics
  • Materials Chemistry

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