Direct observation of tunable surface structure and reactivity in TiO2 nanopowders
| Autor: | Emily A. A. Jarvis, Tatiana Eugenievna Kurennykh, Katherine Grace Johnson, V. B. Vykhodets, I. V. Beketov, Anatoly I. Medvedev, O. M. Samatov |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Inorganic chemistry Oxide Nanoparticle 02 engineering and technology Surfaces and Interfaces 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Surfaces Coatings and Films Catalysis chemistry.chemical_compound Surface area chemistry Chemical engineering 0103 physical sciences Materials Chemistry Cubic zirconia Reactivity (chemistry) 010306 general physics 0210 nano-technology Stoichiometry Surface states |
| Zdroj: | Surface Science. 665:10-19 |
| ISSN: | 0039-6028 |
| DOI: | 10.1016/j.susc.2017.08.001 |
| Popis: | Surface structure and reactivity is of primary importance in numerous metal oxide applications. Nanopowders can offer advantages both in ease of preparation and in total surface area relative to monocrystals. Although monocrystal surfaces have been characterized using a variety of spectroscopy and microscopy techniques, key features of these surfaces may not translate to nanopowders. In previous studies of alumina and zirconia, we employed nuclear reaction analysis coupled with density functional calculations to show that the atomic and electronic structures of these nanopowder surfaces are distinct from those predicted thermodynamically for macroscopic crystals. Here, we report similar findings for the technologically important metal oxide TiO 2 . For the first time, we extend our studies to characterize these nanopowders’ surface reactivity with oxygen and hydrogen. We observe reactivity indicative of surface states with metallic character distinct from the stoichiometric oxide. This notable behavior holds crucial implications for use of these powders as catalysts and catalyst supports. |
| Databáze: | OpenAIRE |
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