Characterization of Fe-TiO2 films synthesized by sol-gel method for application in energy conversion devices

Reginaldo da Silva Santos; Haroldo G. de Oliveira; Claudia Longo

doi:10.1117/12.827397

20 August 2009 Characterization of Fe-TiO₂ films synthesized by sol-gel method for application in energy conversion devices

Reginaldo da Silva Santos, Haroldo G. de Oliveira, Claudia Longo

Author Affiliations +

Proceedings Volume 7408, Solar Hydrogen and Nanotechnology IV; 74080O (2009) https://doi.org/10.1117/12.827397
Event: SPIE Solar Energy + Technology, 2009, San Diego, California, United States

Abstract

Fe-TiO₂ particles were synthesized by sol-gel process from hydrolysis of titanium tetra-isopropoxide with nitric acid and ferric nitrate aqueous solutions (relative Fe:Ti molar ratio ranging from 1 to 6 at %) followed by hydrothermal treatment. Thin films were deposited onto conducting glass electrodes from a suspension with polyethylene glycol and heating at 450 °C for 30 min, which resulted in 1.5 μm thick transparent porous films. Crystalline samples, 93 % anatase and 7 % brookite, were obtained. Increasing the iron amount, the crystallite size estimated from XRD patterns ranged from 18 to 11 nm and the color varied from slightly yellow to brown. The optical properties have also changed; the absorption edge shifted towards longer wavelengths, with band gap energy decreasing from 3.0 to 2.7 eV. The films exhibited photocatalytic activity for phenol degradation that indicates promising applications in solar energy conversion.

Citation Download Citation

Reginaldo da Silva Santos, Haroldo G. de Oliveira, and Claudia Longo "Characterization of Fe-TiO₂ films synthesized by sol-gel method for application in energy conversion devices", Proc. SPIE 7408, Solar Hydrogen and Nanotechnology IV, 74080O (20 August 2009); https://doi.org/10.1117/12.827397

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