Formation and Evolution of Ultrathin Silica Polymorphs on Ru(0001) Studied with Combined in Situ, Real-Time Methods
| Autor: | Alexander Fuhrich, Dietrich Menzel, Mauricio J. Prieto, Feng Xiong, Gina Peschel, Ewa Madej, Hagen W. Klemm, Thomas Schmidt, Hans-Joachim Freund |
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| Rok vydání: | 2018 |
| Předmět: |
In situ
Materials science Silicon Bilayer Resolution (electron density) Nucleation chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials General Energy Zigzag chemistry Chemical physics Monolayer Physical and Theoretical Chemistry 0210 nano-technology Layer (electronics) |
| Zdroj: | The Journal of Physical Chemistry C. 123:8228-8243 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/acs.jpcc.8b08525 |
| Popis: | Silica mono- and bilayer films on Ru(0001) can be physisorbed or chemisorbed, with ordered or vitreous structures, depending on the particular preparation procedures applied. Using the SMART spectro-microscope at BESSY-II with its capabilities for μ-spectroscopy, μ-diffraction, and LEEM imaging with lateral resolution below 5 nm, in situ and in real time and applied to identical areas, we have investigated the formation of these layers, defined and characterized their properties and their connected morphology, and followed their evolution. Two distinct chemisorbed monolayers and three bilayers (physisorbed crystalline and vitreous, and chemisorbed zigzag phases), and some transitions between them, have been studied. We found that, apart from the deposited silicon amount, the most important parameter for steering the evolution to a particular well-defined layer is the oxygen content at the Ru interface. Nucleation and growth of all layers are homogeneous on the scale of our resolution, leading to rather sm... |
| Databáze: | OpenAIRE |
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