Preparation of nanoporous titania films by surface sol-gel process accompanied by low-temperature oxygen plasma treatment

Jianguo Huang, Izumi Ichinose, Toyoki Kunitake, Aiko Nakao

Research output: Contribution to journalArticlepeer-review

74 Citations (Scopus)

Abstract

Nanoporous ultrathin films of titania were prepared. First, a titania/poly(acrylic acid) (PAA) nanocomposite film was prepared via the surface sol-gel process, with the thickness of the titania gel layer to be 0.44 ± 0.10 nm/cycle. The organic species in the film were then removed by low-temperature oxygen plasma treatment, as monitored by quartz crystal microbalance frequency measurement and Fourier transform infrared and X-ray photoelectron spectroscopies. The plasma treatment was effective at least up to the depth of 10-12 nm. The resulting ultrathin titania film showed a UV-visible absorption with the edge at about 330 nm, which is considerably blue-shifted from that of bulk titania. The film surface was flat and uniform over a large area, and its density was as low as 0.54 g/cm3. Transmission electron microscopy revealed the presence of pores with diameters of ca. 2 nm. The pore existence was confirmed by the formation of silver nanoparticles inside the film by photoreduction of silver ions.

Original languageEnglish
Pages (from-to)9048-9053
Number of pages6
JournalLangmuir
Volume18
Issue number23
DOIs
Publication statusPublished - Nov 12 2002
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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