Probing electrons in TiO2 polaronic trap states by IR-absorption: Evidence for the existence of hydrogenic states

Scientific Reports

Volumn 4, Issue , 2014, Pages

  Sezen, Hikmet ^a   Buchholz, Maria ^a   Nefedov, Alexei ^a   Natzeck, Carsten ^a   Heissler, Stefan ^a   Di Valentin, Cristiana ^b   Wöll, Christof ^a  

^a KARLSRUHE INSTITUTE OF TECHNOLOGY   (Germany)

^b UNIVERSITY OF MILANO BICOCCA   (Italy)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 84893105644     PISSN: None     EISSN: 20452322     Source Type: Journal    
DOI: 10.1038/srep03808     Document Type: Article

References (33)

1. Diebold, U. The surface science of titanium dioxide. Surf. Sci. Rep. 48, 53-229 (2003)
2. Henderson, M. A. A surface science perspective on photocatalysis. Surf. Sci. Rep. 66, 185-297 (2011)
3. Linsebigler, A. L., Lu, G. &Yates, J. T. Jr. Photocatalysis on TiO2 surfaces: Principles, mechanisms, and selected results. Chem. Rev. 95, 735-758 (1995)
4. Pang, C. L., Lindsay, R. &Thornton, G. Structure of clean and adsorbate-covered single-crystal rutile TiO2 surfaces. Chem. Rev. 113, 3887-3948 (2013)
5. Thompson, T. L. &Yates, J. T. Surface science studies of the photoactivation of TiO2-new photochemical processes. Chem. Rev. 106, 4428-4453 (2006) (Pubitemid 44782244)
6. O'Regan, B. &Gratzel, M. A low-cost, high-efficiency solar cell based on dyesensitized colloidal TiO2 films. Nature 353, 737-740 (1991) (Pubitemid 21912607)
7. Fujishima, A.&Honda, K. Electrochemical photolysis of water at a semiconductor electrode. Nature 238, 37-38 (1972)
8. Xu,M. et al. Photocatalytic activity of bulk TiO2 anatase and rutile single crystals using infrared absorption spectroscopy. Phys. Rev. Lett. 106, 138302 (2011)
9. Berger, T. &Anta, J. A. IR-Spectrophotoelectrochemical characterization of mesoporous semiconductor films. Anal. Chem. 84, 3053-3057 (2012)
10. Berger, T., Anta, J. A. &Morales-Flórez, V. C. Electrons in the band gap: spectroscopic characterization of anatase TiO2 nanocrystal electrodes under fermi level control. J. Phys. Chem. C 116, 11444-11455 (2012)
11. Panayotov, D. A., Burrows, S. P. &Morris, J. R. Infrared spectroscopic studies of conduction band and trapped electrons in UV-photoexcited, H-atom n-doped, and thermally reduced TiO2. J. Phys. Chem. C 116, 4535-4544 (2012)
12. Savory, D. M.,Warren, D. S. &McQuillan, A. J. Shallow electron trap, interfacial water, and outer-sphere adsorbed oxalate IR absorptions correlate during UV irradiation of photocatalytic TiO2 films in aqueous solution. J. Phys. Chem. C 115, 902-907 (2011)
13. Szczepankiewicz, S. H., Moss, J. A. &Hoffmann, M. R. Slow surface charge trapping kinetics on irradiated TiO2. J. Phys. Chem. B 106, 2922-2927 (2002) (Pubitemid 35290302)
14. Yamakata, A., Ishibashi, T.-a. &Onishi, H. Time-resolved infrared absorption spectroscopy of photogenerated electrons in platinized TiO2 particles. Chem. Phys. Lett. 333, 271-277 (2001) (Pubitemid 33627967)
15. Yamakata, A., Ishibashi, T.-a. &Onishi, H. Kinetics of the photocatalytic watersplitting reaction on TiO2 and Pt/TiO2 studied by time-resolved infrared absorption spectroscopy. J. Mol. Catal. A: Chem. 199, 85-94 (2003)
16. Di Valentin, C., Pacchioni, G. &Selloni, A. Reduced and n-type doped TiO2: Nature of Ti31 species. J. Phys. Chem. C 113, 20543-20552 (2009)
17. Di Valentin, C. &Selloni, A. Bulk and surface polarons in photoexcited anatase TiO2. J. Phys. Chem. Lett. 2, 2223-2228 (2011)
18. Deák, P., Aradi, B. &Frauenheim, T. Quantitative theory of the oxygen vacancy and carrier self-trapping in bulk TiO2. Phys. Rev. B 86, 195206 (2012)
19. Janotti, A., Franchini, C., Varley, J. B., Kresse, G. &Van de Walle, C. G. Dual behavior of excess electrons in rutile TiO2. Phys. Status Solidi Rapid Res. Lett. 7, 199-203 (2013)
20. Panayotov, D. A. &Yates Jr, J. T. n-Type doping of TiO2 with atomic hydrogenobservation of the production of conduction band electrons by infrared spectroscopy. Chem. Phys. Lett. 436, 204-208 (2007) (Pubitemid 46217010)
21. Takahashi, H.,Watanabe, R.,Miyauchi, Y. &Mizutani, G. Discovery of deep and shallow trap states from step structures of rutile TiO2 vicinal surfaces by second harmonic and sum frequency generation spectroscopy. J. Chem. Phys. 134, 154704 (2011)
22. Takeshita, K. et al. Transient IR absorption study of charge carriers photogenerated in sulfur-doped TiO2. J. Photochem. and Photobiol. A: Chem. 177, 269-275 (2006)
23. Panayotov, D. A.&Yates, J. T. Spectroscopic detection of hydrogen atom spillover from Au nanoparticles supported on TiO2: Use of conduction band electrons. J. Phys. Chem. C 111, 2959-2964 (2007) (Pubitemid 46384305)
24. Yin, X.-L. et al. Diffusion versus desorption: Complex behavior of H atoms on an oxide surface. ChemPhysChem 9, 253-256 (2008)
25. Herklotz, F., Lavrov, E. V. &Weber, J. Infrared absorption of the hydrogen donor in rutile TiO2. Phys. Rev. B 83, 235202 (2011)
26. Panayotov, D. A., Burrows, S. P., Yates, J. T. Jr. &Morris, J. R. Mechanistic studies of hydrogen dissociation and spillover on Au/TiO2: IR spectroscopy of coadsorbed CO and H-donated electrons. J. Phys. Chem. C 115, 22400-22408 (2011)
27. Hayden, B. E., King, A. &Newton,M. A. Fourier transform reflection-absorption IR spectroscopy study of formate adsorption on TiO2(110)J. Phys. Chem. B 103, 203-208 (1999) (Pubitemid 129680311)
28. Kimmel, G. A. et al. Polarization- and azimuth-resolved infrared spectroscopy of water on TiO2(110): Anisotropy and the hydrogen-bonding network. J Phys. Chem. Lett. 3, 778-784 (2012)
29. Rohmann, C. et al. Direct monitoring of photo-induced reactions on well-defined metal oxide surfaces using vibrational spectroscopy. Chem. Phys. Lett. 460, 10-12 (2008)
30. Deskins, N. A., Rousseau, R. &Dupuis, M. Localized electronic states from surface hydroxyls and polarons in TiO2(110) J. Phys. Chem. C 113, 14583-14586 (2009)
31. Osterloh, N., Silber, D., Traeger, F. &Wöll, C. Water adsorption on r-TiO2(110): Presence of a well-defined (1 3 1)-structure as evidenced by He-atom scattering. Phys. Status Solidi B 250, 1235-1241 (2013)
32. Sambi, M., Sangiovanni, G., Granozzi, G. &Parmigiani, F. Growth and the structure of epitaxial VO2 at the TiO2(110) surface. Physical Review B 55, 7850-7858 (1997)
33. Kunat, M., Gil Girol, S., Becker, T., Burghaus, U. &Wöll, C. Stability of the polar surfaces of ZnO: A reinvestigation using He-atom scattering. Phys. Rev. B 66, 081402 (2002)