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A Quantitative Structural Investigation of the 0.1 wt % Nb-SrTiO3(001)/H2O Interface

Hussain, H; Torrelles, X; Rajput, P; Nicotra, M; Thornton, G; Zegenhagen, J; (2014) A Quantitative Structural Investigation of the 0.1 wt % Nb-SrTiO3(001)/H2O Interface. Journal of Physical Chemistry C , 118 (20) 10980 - 10988. 10.1021/jp5034118. Green open access

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Abstract

Surface X-ray diffraction has been employed to elucidate the structure of the interface between a well-characterized (001) surface of 0.1 wt % Nb–SrTiO3 and liquid H2O. Results are reported for the clean surface, the surface in contact with a drop of liquid water, and the surface after the water droplet has been removed with a flow of nitrogen. The investigation revealed that the clean surface, prepared via annealing in 1 × 10–2 mbar O2 partial pressure, is unreconstructed and rough on a short length scale. The surface is covered with large terraces, the topmost layer of which is either TiO2 or SrO with an area ratio of about 7/3. For the surface in contact with water, our results reveal that associative H2O adsorption is favored for the TiO2-terminated terrace whereas adsorption is dissociative for the SrO-terminated terrace, which validates recent first-principles calculations. After removal of the water droplet, the surface largely resembles the water-covered surface but now with a disordered overlayer of water present on the surface.

Type: Article
Title: A Quantitative Structural Investigation of the 0.1 wt % Nb-SrTiO3(001)/H2O Interface
Open access status: An open access version is available from UCL Discovery
DOI: 10.1021/jp5034118
Publisher version: http://dx.doi.org/10.1021/jp5034118
Language: English
Additional information: Available for re-use under the terms of a CC BY 4.0 ;icence. Further information is available at: http://pubs.acs.org/page/policy/authorchoice_ccby_termsofuse.html
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
URI: https://discovery.ucl.ac.uk/id/eprint/1434308
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