Ostwald ripening of charged supported metal nanoparticles: Schottky model |
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| Affiliation: | 1. Department of Applied Physics, Chalmers University of Technology, S-412 96 Göteborg, Sweden;2. Boreskov Institute of Catalysis, Russian Academy of Sciences, Novosibirsk 630090, Russia;1. Department of Optical Science and Engineering, and Shanghai Ultra-Precision Optical Manufacturing Engineering Center, Fudan University, Shanghai 200433, China;2. Thin Film Optoelectronic Technology Center, Chinese Academy of Science, Shanghai 201210, China;1. Centre for Photonics and Nanotechnology, Sona College of Technology, Salem 636 005, Tamilnadu, India;2. Department of Frontier Materials, Nagoya Institute of Technology, Nagoya 466-8555, Japan;1. School of Civil Engineering, Shandong University, Jinan 250061, China;2. State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace, Xi’an Jiaotong University, Xi’an 710049, China;3. School of Mechanical Engineering, Shandong University, Jinan 250061, China;1. Department of Physics, University of Guilan, Rasht, Iran;2. Institute of Theoretical Physics and Astronomy, Vilnius University, A. Gostauto 12, LT-01108 Vilnius, Lithuania;1. Laboratoire d''Etude des Matériaux Avancés et Applications (LEM2A), Université Moulay Ismaïl, FSM-FPE-ESTM, BP 11201 Zitoune, Meknes, Morocco;2. Laboratoire Charles Coulomb (L2C), UMR 5221 CNRS-Université de Montpellier, Montpellier F-34095, France |
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| Abstract: | Due to high surface area, supported metal nanoparticles are thermodynamically prone to sintering. The experimental studies of this process exhibit sometimes transient bimodal particle size distributions. Such observations may result from the support heterogeneity. Looking retrospectively, one can also find the prediction that in the case of Ostwald ripening this feature can be related to charge of metal nanoparticles. In real systems, this charge is often associated with the metal–support interaction and can be interpreted in the framework of the Schottky model. Using this model, the author shows that the charge redistribution cannot be behind bimodal particle size distributions. Moreover, the corresponding contribution to the driving force for Ostwald ripening is typically much smaller than the conventional one. |
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| Keywords: | Supported metal nanoparticles Sintering Metal–semiconductor interface Charge transfer Catalysis |
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