Fabrication and characterization of TiO2 thin film prepared by a layer-by-layer self-assembly method

Jin Ho Kim, Shiro Fujita, Seimei Shiratori

Research output: Contribution to journalConference articlepeer-review

52 Citations (Scopus)

Abstract

Titanium dioxide (TiO2) thin films assembled with TiO 2 nanoparticles and oppositely charged polyelectrolytes or titanium (IV) bis(ammonium lactato) dihydroxide (TALH) were successfully fabricated via a layer-by-layer (LBL) self-assembly method at room temperature. Especially, by using the quartz crystal microbalance (QCM) to monitor the in-situ deposition phenomenon of TALH that is saturated and then separated from the film before and after the deposition of 30 s at low pH, the anatase TiO2 multilayer films fabricated with 30 s deposition in TALH adjusted to pH 2.5 showed a higher refractive index (ca. n = 1.75), a denser film growth, and a lower surface roughness (ca. 10.5 nm) than those of the films deposited in different conditions. This film showed a high transmittance in visible range for optical applications and photocatalytic properties by decomposing methyl orange molecules gradually according to UV irradiation time. In addition, as the pH of TALH was decreased from pH 5.5 to 2.0, the thickness of (TiO2 / TALH)30 film was increased from ca. 85 nm to ca. 442 nm.

Original languageEnglish
Pages (from-to)83-89
Number of pages7
JournalThin Solid Films
Volume499
Issue number1-2
DOIs
Publication statusPublished - 2006 Mar 21
EventProceedings of the Sixth International Conference on Nano-Molecular Electronics (ICNME 2004) -
Duration: 2004 Dec 152004 Dec 17

Keywords

  • Layer-by-layer self-assembly method
  • Polyelectrolyte
  • Quartz crystal microbalance
  • TiO thin film

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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