Abstract
Reducing the recombination rate of photo-generated electron-hole pairs in the surface of pristine TiO2 materials can be done, among others, via local spatial charge separation in the photocatalytically active surface region. A local electric field acting for this purpose can be ensured, for instance, in hetero-junction regions formed at the interface between a TiO2 film and a WO3 ultra-thin layer. The option for the WO3–TiO2 semiconductor pair is related to the suitable fit of their band structures. To model the interface, a more in-depth knowledge of local atomic environment is required. Here, we discuss the local atomic ordering and the related effects in the interface region of TiO2/WO3 and WO3/TiO2 structures grown on Si(100) substrates. Materials characterization was done by using XRD, XPS and XAS techniques. We demonstrate that tungsten atoms enter as W6+ or W4+ cations into the rutile-type TiO2 lattice, by substituting the Ti4+ cations. While W6+-Ti4+ substitution leaves the surrounding rutile matrix unchanged, the W4+-Ti4+ substitution induces a local rutile-to-anatase transition. The current results are relevant in designing new applications structures with enhanced photocatalytic performances.
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Acknowledgements
Two of the authors (DM and CMT) have contributed to this work within the ‘‘Kernel” Project PN09-450101, funded by the Romanian Ministry of Education and the National Authority for Scientific Research. Part of the investigations have been done in the frame the COFOBIST project financed by the Romanian Ministry of Education (proj. 697/2013).
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Macovei, D., Dăscăleanu, V., Teodorescu, C.M., Luca, D. (2016). Local Ordering at the Interface of the TiO2-WO3 Bi-Layers. In: Tiginyanu, I., Topala, P., Ursaki, V. (eds) Nanostructures and Thin Films for Multifunctional Applications. NanoScience and Technology. Springer, Cham. https://doi.org/10.1007/978-3-319-30198-3_10
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