Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 35: Poster Session I (Metal, semiconductor and oxide substrates: structure and adsorbates; Graphene)
O 35.49: Poster
Dienstag, 12. März 2013, 18:15–21:45, Poster B1
XPS analysis of Carbon-Nitrogen codoped TiO2 - influence of pH and codoped Boron — •Fabian Argast1, Christian Gebauer1, Thomas Diemant1, Joachim Bansmann1, Maximilian Wassner2, Nicola Hüsing2, and R. Jürgen Behm1 — 1Institute of Surface Chemistry and Catalysis, Ulm University, D-89069 Ulm — 2Paris-Lodron-University Salzburg, A-5020 Salzburg
TiO2 has been used for photo-electrochemical applications, e.g., in water splitting. However, undesired recombination of photoexcited carriers and a high band gap of TiO2 limit its practical application and efficiency. Doping of TiO2 with boron, carbon and nitrogen is expected to reduce the band gap of the material by inducing defect states in the band gap and increase the photocatalytic activity for light absorption into the visible region [1].
The samples were prepared via a sol-gel process using tetrabutyl titanate as a precursor. In a first approach, tetrabutylammonium hydroxide or tetrabutylammonium nitrate were used as donor sources for C and N. Furthermore, the possible influence of different pH environments were investigated. Next, urea (N and C donor) as well as boric acid were used as co-dopands with the same precursor. The samples were calcined at a temperature regime ranging from of 175∘C to 400∘C (3h) and afterwards measured by XPS to characterize their chemical composition, especially the inclusion of B, C and N species into the TiO2 lattice.
[1] D. Chen et. al., Ind. Eng. Chem. Res. 2007, 46, 2741.