CO adsorption, reduction and oxidation on Pb(Zr,Ti)O3(001) surfaces associated with negatively charged gold nanoparticles
| Autor: | Daniel Lizzit, Cristina Chirila, Lucian Trupina, M.-A. Husanu, Nicoleta G. Apostol, Cristian M. Teodorescu, Ioana A. Hristea |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Analytical chemistry chemistry.chemical_element 02 engineering and technology 010402 general chemistry 01 natural sciences Catalysis Pulsed laser deposition chemistry.chemical_compound Adsorption X-ray photoelectron spectroscopy Desorption Gold nanoparticles Carbon monoxide Ferroelectric surfaces Photoelectron spectroscopy General Chemistry 021001 nanoscience & nanotechnology Ferroelectricity 0104 chemical sciences chemistry Strontium titanate 0210 nano-technology Carbon |
| Popis: | Gold is deposited on atomically clean, inwards polarized, ferroelectric lead zirco-titanate deposited by pulsed laser deposition on strontium titanate (001) single crystal, then carbon monoxide adsorption and desorption experiments are investigated by in situ fast photoelectron spectroscopy using synchrotron radiation. Atomic force microscopy and high resolution photoelectron spectroscopy are consistent with the formation of 50–100 nm nanoparticles, and their Au 4f core levels point to a negative charge state of gold. As compared with a similar experiment performed on ferroelectric lead zirco-titanate with similar polarization state and without gold, the saturation coverage after exposure to carbon monoxide increases by about 68 %, and also most of the additional carbon is found in oxidized state. Desorption experiments with in situ follow-up by photoelectron spectroscopy are performed as function of temperature, and the neutral carbon intensity decreases when the ferroelectric polarization decreases, while the components corresponding to oxidized carbon remain unchanged. It looks that neutral carbon adsorption is strictly related to the polarization of the ferroelectric film, while carbon still found in molecular form is related to its carbonyl bonding on metal nanoparticles, independent of the polarization state of the substrate. Desorbed carbon at higher temperature uptakes oxygen from the substrate. |
| Databáze: | OpenAIRE |
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