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Preparation and characterization of TiO2/carbon composite thin films with enhanced photocatalytic activity
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Structural Chemistry.
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2011 (English)In: Journal of Molecular Catalysis A: Chemical, ISSN 1381-1169, E-ISSN 1873-314X, Vol. 335, no 1-2, 136-144 p.Article in journal (Refereed) Published
Abstract [en]

Composite TiO2/carbon thin films prepared by physical vapor deposition techniques on fused silica substrates show enhanced photocatalytic activity towards decomposition of methanol to CO2 and water, as compared to pure TiO2 films of similar thickness. Raman and XRD measurements confirm that annealed TiO2 films exhibit anatase structure while the carbon layer becomes graphitic. Characteristic for the composite films is an enhanced optical absorption in the visible range. The presence of the carbon film causes a shift of the TiO2 absorption edge and modifies its grain size to be smaller. We hypothesize that the observed enhancement of photocatalytic activity is due to synergy effects at the carbon/TiO2 interface, resulting in smaller titania crystallite size and anisotropic charge carrier transport, which in turn reduces their recombination probability.

Place, publisher, year, edition, pages
2011. Vol. 335, no 1-2, 136-144 p.
Keyword [en]
Titanium dioxide, Carbon, Thin film, Characterization, Photocatalysis, Methanol decomposition
National Category
Chemical Sciences Inorganic Chemistry
Research subject
Chemistry with specialization in Inorganic Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-148928DOI: 10.1016/j.molcata.2010.11.025ISI: 000287058900019OAI: oai:DiVA.org:uu-148928DiVA: diva2:403910
Available from: 2011-03-15 Created: 2011-03-14 Last updated: 2017-12-11Bibliographically approved

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Zhu, Jiefang

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