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| Naji, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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Nandy, Suman
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Topics
Publications (10/10 displayed)
- 2022Smart IoT enabled interactive self-powered security tag designed with functionalized papercitations
- 2021Highly conductive grain boundaries in copper oxide thin films
- 2020Touch-Interactive Flexible Sustainable Energy Harvester and Self-Powered Smart Cardcitations
- 2020Touch-Interactive Flexible Sustainable Energy Harvester and Self-Powered Smart Cardcitations
- 2018Green Nanotechnology from Waste Carbon-Polyaniline Compositecitations
- 2018Green Nanotechnology from Waste Carbon-Polyaniline Composite ; Generation of Wavelength-Independent Multiband Photoluminescence for Sensitive Ion Detectioncitations
- 2016Photocatalytic behavior of TiO2 films synthesized by microwave irradiationcitations
- 2016Stress Induced Mechano-electrical Writing-Reading of Polymer Film Powered by Contact Electrification Mechanismcitations
- 2016Highly conductive grain boundaries in copper oxide thin filmscitations
- 2013Current transport mechanism at metal-semiconductor nanoscale interfaces based on ultrahigh density arrays of p-type NiO nano-pillarscitations
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article
Photocatalytic behavior of TiO2 films synthesized by microwave irradiation
Abstract
Titanium dioxide was synthesized on glass substrates from titanium (IV)isopropoxide and hydrochloride acid aqueous solutions through microwave irradiation using as seed layer either fluorine-doped crystalline tin oxide (SnO2:F) or amorphous tin oxide (a-SnOx). Three routes have been followed with distinct outcome: (i) equimolar hydrochloride acid/water proportions (1HCl:1water) resulted in nanorod arrays for both seed layers; (ii) higher water proportion (1HCl:3water) originated denser films with growth yield dependent on the seed layer employed; while (iii) higher acid proportion (3HCl:1water) hindered the formation of TiO2. X-ray diffraction (XRD) showed that the materials crystallized with the rutile structure, possibly with minute fractions of brookite and/or anatase. XRD peak inversions observed for the materials synthesized on crystalline seeds pointed to preferred crystallographic orientation. Electron diffraction showed that the especially strong XRD peak inversions observed for TiO2 grown from the 1HCl:3water solution on SnO2:F originated from a [001] fiber texture. Transmittance spectrophotometry showed that the materials with finer structure exhibited significantly higher optical band gaps. Photocatalytic activity was assessed from methylene blue degradation, with the 1HCl:3water SnO2:F material showing remarkable degradability performance, attributed to a higher exposure of (001) facets, together with stability and reusability.