Journal
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
Volume 176, Issue 9, Pages 716-722Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.mseb.2011.02.027
Keywords
Nanocomposites; Optical properties; Sensors; Thin films; Sol-gel
Funding
- Padova University
- Fondazione CARIPARO
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Thin films composed of a matrix of titanium and nickel oxides, doped with gold nanoparticles have been prepared with the sol-gel method and annealed at different time/temperature combinations. Structural characterizations demonstrate the crystallization of nickel titanate and of TiO2-rutile due to nickel capability to promote rutile crystallization over anatase. Optical characterizations show a tunable refractive index of the samples according to the Ti/Ni ratio, and a high amount of residual porosity even after high temperature annealing. Sensor functionality measurements were performed with H-2, CO and H2S: high sensitivity for hydrogen sulfide detection has been proved, and the cross sensitivity to the other two gases can be tuned by controlling the nickel amount. For high Ni concentrations, the matrix is composed of NiTiO3 and TiO2-rutile, and no cross sensitivity is experienced. For lower Ni amounts, TiO2-anatase starts to crystallize and the films become sensitive to H-2 and CO. (C) 2011 Elsevier B.V. All rights reserved.
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