Description of TiO(2) thin films treated in NH(3) atmosphere by optical dispersion models (Journal article)

Giannakopoulou, T./ Todorova, N./ Osiceanu, P./ Lagoyannis, A./ Vaimakis, T./ Trapalis, C.

The influence of a reductive ammonia atmosphere on TiO(2) sol-gel film structural and optical characteristics was investigated. X-ray Diffraction technique, X-ray photoelectron spectroscopy and Rutherford Back Scattering analysis were applied to study the crystallinity, oxidation state and element concentration profile of the modified films. Their optical properties were investigated by UV-Vis spectroscopy. The refractive index and extinction coefficient were obtained by fitting theoretical transmittance curves to experimental ones using Forouhi-Bloomer (FB) and Tauc-Lorentz (TL) physical models. Both models revealed slight decrease (up to 2.6-2.7 eV) of the FB and TL band gaps with increase of the treatment temperature. These results were discussed in terms of the additional energy levels creation due to the defect TiO(2) structure formation during thermal treatment in reductive atmosphere. Crown Copyright (C) 2009 Published by Elsevier B.V. All rights reserved.
Institution and School/Department of submitter: Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας
Keywords: titanium dioxide,band gap,absorption edge,dispersion models,annealing,sol-gel,photocatalyst,dip coating deposition,chemical-vapor-deposition,photocatalytic activity,titanium-dioxide,powders,dependence,silicon
ISSN: 0040-6090
Link: <Go to ISI>://000270410800039
Publisher: Elsevier
Appears in Collections:Άρθρα σε επιστημονικά περιοδικά ( Ανοικτά)

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