Improvement of thermal stability of porous titania films prepared by electrostatic sol-spray deposition (ESSD)

Mikihiro Nomura, Ben Meester, Joop Schoonman, Freek Kapteijn, Jacob A. Moulijn

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

A porous titania film with uniform pores of micrometer size was obtained on a dense stainless steel substrate by the electrostatic sol-spray deposition (ESSD) method. A porous film without cracks was obtained from the parent titania sol after more than 5 h of aging. This porous structure comprised an aggregation of fibrous titania. The pore size and the surface morphology were controlled by changing the aging period of the parent sol. The asdeposited films were shown to be amorphous titania by XRD analysis. They were calcined in order to obtain anatase or rutile titania. The structures of the porous films were damaged during the calcination at 873 K in air. Improved thermal stability of the porous titania films was obtained from a parent sol made by mixing fresh reactive titania sol and aged sol. Additionally, small particle structures were observed intergrown with the fibrous structures. The surface morphology of these films was not damaged by calcination at 873 and 1273 K in air. After calcination at 873 K, only the anatase phase was observed by the XRD measurement, whereas only the rutile phase was found after calcination at 1273 K. Porous anatase or rutile films can be produced using ESSD and proper calcination.

Original languageEnglish
Pages (from-to)1283-1288
Number of pages6
JournalChemistry of Materials
Volume15
Issue number6
DOIs
Publication statusPublished - 2003 Mar 25
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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