UV–Ozone Cleaning of Supported Poly(vinylpyrrolidone)-Stabilized Palladium Nanocubes: Effect of Stabilizer Removal on Morphology and Catalytic Behavior
| Autor: | Jean-Michel Andanson, Byungkwong Lim, Artur Yarulin, Younan Xia, Lioubov Kiwi-Minsker, Micaela Crespo-Quesada |
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| Přispěvatelé: | Ecole Polytechnique Fédérale de Lausanne (EPFL) |
| Rok vydání: | 2011 |
| Předmět: |
Materials science
Metal Nanocrystals Ultraviolet Rays Scanning electron microscope chemistry.chemical_element Infrared spectroscopy Nanoparticle Platinum Nanocrystals 02 engineering and technology Shape-Controlled Synthesis 010402 general chemistry 01 natural sciences Chemical reaction Catalysis Ozone Pd Nanocrystals X-ray photoelectron spectroscopy Electrochemistry [CHIM]Chemical Sciences Organic chemistry General Materials Science Carbon-Monoxide ComputingMilieux_MISCELLANEOUS Spectroscopy Acetylene technology industry and agriculture Povidone Surfaces and Interfaces 021001 nanoscience & nanotechnology Condensed Matter Physics Selective Hydrogenation Nanostructures 0104 chemical sciences Surface chemistry Chemical engineering Co Oxidation Attenuated total reflection Nanoparticles 0210 nano-technology Palladium |
| Zdroj: | Langmuir Langmuir, American Chemical Society, 2011, 27 (12), pp.7909-7916. ⟨10.1021/la201007m⟩ |
| ISSN: | 1520-5827 0743-7463 |
| Popis: | Poly(vinylpyrrolidone) (PVP)-stabilized Pd nanocubes were synthesized, deposited on a carbon-based support, and subsequently treated with UV-ozone (UVO) in order to eliminate the traces of PVP still present on the surface. Cubes, being a thermodynamically unfavorable shape, are very prone to restructuring to minimize the interfacial free energy and thus allow the assessment of their morphological stability during UVO cleaning. The process of PVP removal was monitored by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and in situ attenuated total reflection infrared spectroscopy (ATR-IR). High-resolution scanning electron microscopy (SEM) imaging was used to evaluate the morphology of the nanocubes. The effect of PVP removal was also studied in the hydrogenation of acetylene, showing a 4-fold increase of activity. This method can be applied to nanoparticles of other common shapes, which expose different crystal planes, in order to study the structure sensitivity of chemical reactions. |
| Databáze: | OpenAIRE |
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