Optical and electrochromic properties of sol-gel made CeO2TiO2 thin films


Ghodsi F., Tepehan F., Tepehan G.

ELECTROCHIMICA ACTA, vol.44, no.18, pp.3127-3136, 1999 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 44 Issue: 18
  • Publication Date: 1999
  • Doi Number: 10.1016/s0013-4686(99)00030-4
  • Journal Name: ELECTROCHIMICA ACTA
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.3127-3136
  • Istanbul Technical University Affiliated: No

Abstract

The optical and electrochromic properties of sol-gel dip coated equimolar CeO2-TiO2 thin films were investigated. The coating solutions were prepared by using mixed organic and inorganic (Ti[O(CH2)(3)CH3](4) and (NH4)(2)Ce(NO3)(6)) precursors. The refractive index, absorption coefficient and packing densities of the films have been calculated with respect to the pulling rate and number of coating layers. The surface compositions of the films were studied by an X-ray photoelectron spectrometer (XPS). A scanning electron microscope was used for the analysis of surface structure. The optical band gaps have been found as E-g(d) = 3.59 +/- 0.12 eV and E-g(ind) = 3.19 +/- 0.08 eV for direct and indirect transitions, respectively. The results show independence of optical band gaps with dipping rate and number of layers.