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Chemical vapor infiltration of photocatalytically active TiO2 thin films on glass microfibers

Sarantopoulos, Christos and Gleizes, Alain and Maury, Francis Chemical vapor infiltration of photocatalytically active TiO2 thin films on glass microfibers. (2007) Surface and Coatings Technology, vol. 201 (n° 22 - 23). pp. 9354-9358. ISSN 0257-8972

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Official URL: http://dx.doi.org/10.1016/j.surfcoat.2007.04.073

Abstract

Due to the high diffusivity of the chemical species, chemical vapor infiltration (CVI) is a suitable process for the conformal coverage of objects with large dimensions and complex shape geometry. Its large scale capacity and high reproducibility have made the technique favorable for the deposition of non-oxide ceramics. There are few works on other materials and metal-organic compounds are rarely used as molecular precursors. In this study we focus on the deposition of anatase thin films on substrates with large surface area (microfibers) for photocatalytic air treatment systems. Titanium tetra-isopropoxide (TTIP) was used as precursor without additional oxygen source. Using low mole fractions (26–124×10−5) and low deposition temperatures (300–400 °C), a relatively good thickness uniformity was obtained along the reactor axis. Infiltration experiments were achieved in this temperature range and under 1 Torr for high TTIP diffusivity (110–146 cm2 s−1) and low initial Thiele modulus (0.11–0.13) values. Photocatalytic activity of TiO2 coated glass microfiber samples depends on the film morphology, average thickness and infiltration efficiency. It is shown that this later parameter plays a major role due to the increase of active surface area.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Surface and Coatings Technology website : http://www.sciencedirect.com/science/journal/02578972
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
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Deposited By: Celine Cabaup
Deposited On:06 May 2009 12:19

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