International Journal of Thermophysics

, Volume 35, Issue 11, pp 1990–2000 | Cite as

Characterization of Pure and Modified TiO\(_{2}\) Layer on Glass and Aluminum Support by Beam Deflection Spectrometry

  • Dorota Korte
  • Egon Pavlica
  • Gvido Bratina
  • Mladen Franko


\(\mathrm {TiO}_{2}\) thin films used as photocatalysts in environmental applications were studied by beam deflection spectroscopy (BDS) and by atomic force microscopy. A novel multiparameter theoretical model was developed in order to explain BDS experimental data. The fundamental parameters of examined films: thermal diffusivity, thermal conductivity, and charge transport properties such as the value of the energy bandgap, carrier lifetime, concentration, and type of dopants, were obtained as results of the modeling of BDS data. With BDS, we observed that the material’s thermal conductivity and thermal diffusivity depend also on the porosity and the surface roughness of films. Consequently, the photocatalytic performance can be estimated by measuring the thermal diffusivity of films. Furthermore, we found that surface roughness is prone to changes when the film is used as photocatalysts in water purification processes. During the purification process, the roughness decreases and the photocatalytical performance drops. Moreover, it was discovered that the thermal, electrical, and morphological properties of photocatalysts films depend on the support to which the \(\mathrm {TiO}_{2}\) layer is deposited. These complex relations demonstrate that knowledge of fundamental physical parameters is required in order to improve the photocatalytic performance of \(\mathrm {TiO}_{2}\) films. In this view, the BDS measurements offer a tool for noncontact and nondestructive evaluation of thermal and electronic parameters of thin film \(\mathrm {TiO}_{2}\) photocatalysts as demonstrated in this work.


Photocatalytic activity Photothermal beam deflection spectrometry Thin films \(\mathrm {TiO}_{2}\) 



Authors would like to thank the Slovenian Research Agency for funding this work through research grants Z7-4325-1540: “Characterization of semiconductor nanomaterials by determining their optical and thermal parameters using the photothermal effect” and P1-0034: “Analytics and chemical characterization of materials and processes.” The photocatalytic films were kindly provided by Prof. Urška Lavrenčič-Štangar and her group at the University of Nova Gorica. G.B. and E.P. acknowledge the support of Slovenian Research Agency under the research program P1-0055.


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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • Dorota Korte
    • 1
  • Egon Pavlica
    • 2
  • Gvido Bratina
    • 2
  • Mladen Franko
    • 1
  1. 1.Laboratory of Environmental ResearchUniversity of Nova GoricaNova GoricaSlovenia
  2. 2.Laboratory of Organic Matter PhysicsUniversity of Nova GoricaNova GoricaSlovenia

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