Journal article
Authors list: Leichtweiss, T; Henning, RA; Köttgen, J; Schmidt, RM; Hollander, B; Martin, M; Wuttig, M; Janek, J
Publication year: 2014
Pages: 6631-6640
Journal: Journal of Materials Chemistry A: materials for energy and sustainability
Volume number: 2
Issue number: 18
ISSN: 2050-7488
eISSN: 2050-7496
Open access status: Hybrid
DOI Link: https://doi.org/10.1039/c3ta14816e
Publisher: Royal Society of Chemistry
Abstract:
Oxygen-deficient titanium oxide films (TiOx) have been prepared by pulsed laser deposition at room temperature. Samples in their as-deposited state have an average composition of TiO1.6, are optically absorbing and show electronic conductivities in the range of 10 S cm(-1). The films are metastable and consist of grains of cubic titanium monoxide (gamma-TiO) embedded in an amorphous TiO1.77 matrix. Upon annealing in an argon atmosphere the electrical conductivity of the films increases and comes close to metal-like conductivity (1000 S cm(-1)) at about 450 degrees C whereas the local structure is changed: nanocrystalline grains of metallic Ti are formed in the amorphous matrix due to an internal solid state disproportionation. The highly conductive state can be frozen by quenching. During heat treatment in an argon atmosphere a stoichiometric rutile TiO2 surface layer forms due to oxidation by residual oxygen. The combination of a highly conductive TiOx film with such an approximately 20 nm thick rutile cover layer leads to a surprisingly high efficiency for the water-splitting reaction without the application of an external potential.
Citation Styles
Harvard Citation style: Leichtweiss, T., Henning, R., Köttgen, J., Schmidt, R., Hollander, B., Martin, M., et al. (2014) Amorphous and highly nonstoichiometric titania (TiOx) thin films close to metal-like conductivity, Journal of Materials Chemistry A: materials for energy and sustainability, 2(18), pp. 6631-6640. https://doi.org/10.1039/c3ta14816e
APA Citation style: Leichtweiss, T., Henning, R., Köttgen, J., Schmidt, R., Hollander, B., Martin, M., Wuttig, M., & Janek, J. (2014). Amorphous and highly nonstoichiometric titania (TiOx) thin films close to metal-like conductivity. Journal of Materials Chemistry A: materials for energy and sustainability. 2(18), 6631-6640. https://doi.org/10.1039/c3ta14816e
