Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 7, Issue 16, Pages 3223-3228Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.6b01301
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Funding
- FP7 SETNanoMetro project [604577]
- European Research Council (ERC) under the Horizon research and innovation programme [658056]
- Marie Curie Actions (MSCA) [658056] Funding Source: Marie Curie Actions (MSCA)
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The wealth of properties of titanium dioxide relies on its various polymorphs and on their mixtures coupled with a sensitivity to crystallographic orientations. It is therefore pivotal to set out methods that allow surface structural identification. We demonstrate herein the ability of photoemission spectroscopy to provide Ti LMV (V = valence) Auger templates to quantitatively analyze TiO2 polymorphs. The Ti LMV decay reflects Ti 4sp-O 2p hybridizations that are intrinsic properties of TiO2 phases and orientations. Ti LMV templates collected on rutile (110), anatase (101), and (100) single crystals allow for the quantitative analysis of mixed nanosized powders, which bridges the gap between surfaces of reference and complex materials. As a test bed, the anatase/rutile P25 is studied both as received and during the anatase-to-rutile transformation upon annealing. The agreement with X-ray diffraction measurements proves the reliability of the Auger analysis and highlights its ability to detect surface orientations.
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