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Type: Artigo de evento
Title: Characterization Of Fe-tio2 Films Synthesized By Sol-gel Method For Application In Energy Conversion Devices
Author: Da Silva Santos R.
De Oliveira H.G.
Longo C.
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. © 2009 SPIE.
Rights: aberto
Identifier DOI: 10.1117/12.827397
Date Issue: 2009
Appears in Collections:Unicamp - Artigos e Outros Documentos

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