Processing and Characterization of Porous TiO2 Coatings

Young‐Joo ‐J Kim, Lorraine Falter Francis

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

Titania coatings were prepared by spin coating anhydrous titanium ethoxide solutions onto Si substrates. During deposition, Ti ethoxide in the solution layer reacted with atmospheric moisture to form precipitated particles. The resulting microstructures were composed of a network of particles and particle clusters. The induction time for precipitation, the particle diameter, and the size and packing of particle clusters were influenced by the Ti concentration in the sol and the spinning rate used for deposition. Individual particle sizes ranged from ∼150 to 250 nm. Smaller particles and more compact particle clusters were characteristic of coatings prepared from solutions with lower Ti concentrations and those prepared using faster spinning rates. Asdeposited coatings were amorphous and crystallized into the anatase phase at ∼400°C. Transformation to the rutile phase began at ∼850°C, and the transformation rate was influenced by the microstructure.

Original languageEnglish
Pages (from-to)737-742
Number of pages6
JournalJournal of the American Ceramic Society
Volume76
Issue number3
DOIs
Publication statusPublished - 1993 Mar

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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