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The Influence of Ni doping on the Surface Wettability of TiO2 Thin Films

C. ADOMNITEI1, N. CORNEI1, D. LUCA1, I. SANDU2, V. VASILACHE2, M. DOBROMIR1, D. MARDARE1,*

Affiliation

  1. "Alexandru Ioan Cuza" University, Faculty of Physics, 11 Carol I Blvd., 700506 Iasi Romania
  2. ARHEOINVEST Interdisciplinary Platform, ”Alexandru Ioan Cuza” University of Iasi, 22 Blvd. Carol I, 700506, Iasi, Romania

Abstract

Titanium dioxide (TiO2) materials are well known for their good photocatalytic properties under UV irradiation. Doping is one of the most important methods used to improve these properties. In this paper, we study if Ni impurities in certain concentrations (from 1 at.% to 10 at.%) conduct to higher hydrophilic TiO2 surfaces and, as a consequence, to better photocatalytic properties. The films, deposited by spray pyrolysis method on ITO/glass substrates, are amorphous, and they become polycrystalline, with the presence of the anatase phase, by heat-treatment in air. Ni enters in the TiO2 matrix, as confirmed by X-ray Photoelectron Spectroscopy and by Energy-Dispersive X-Ray Spectroscopy. From the optical transmittance and reflectance measurements, the optical band gap was derived, and we found out that it increases by increasing the Ni content. The hydrophilic properties of all the films were investigated, and a comparison was made as a function of Ni doping..

Keywords

Titania, Ni doped TiO2, Spray pyrolysis, Hydrophilicity, XPS, SEM-EDX, XRD.

Submitted at: Dec. 23, 2014
Accepted at: May 7, 2015

Citation

C. ADOMNITEI, N. CORNEI, D. LUCA, I. SANDU, V. VASILACHE, M. DOBROMIR, D. MARDARE, The Influence of Ni doping on the Surface Wettability of TiO2 Thin Films, Journal of Optoelectronics and Advanced Materials Vol. 17, Iss. 5-6, pp. 889-893 (2015)