Growth of Supported Gold Nanoparticles in Aqueous Phase Studied by in Situ Transmission Electron Microscopy
| Autor: | Meijerink, Mark J., De Jong, Krijn P., Zečević, Jovana, Sub Inorganic Chemistry and Catalysis, Inorganic Chemistry and Catalysis |
|---|---|
| Přispěvatelé: | Sub Inorganic Chemistry and Catalysis, Inorganic Chemistry and Catalysis |
| Rok vydání: | 2019 |
| Předmět: |
Ostwald ripening
Materials science Sintering Nanoparticle 02 engineering and technology 010402 general chemistry 01 natural sciences Article Nanomaterials Coatings and Films symbols.namesake Energy(all) Electronic Optical and Magnetic Materials Physical and Theoretical Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Surfaces General Energy Chemical engineering Colloidal gold Transmission electron microscopy symbols Particle Particle size 0210 nano-technology |
| Zdroj: | Journal of Physical Chemistry C, 124(3), 2202. American Chemical Society The Journal of Physical Chemistry. C, Nanomaterials and Interfaces |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/acs.jpcc.9b10237 |
| Popis: | Nanoparticle growth has long been a significant challenge in nanotechnology and catalysis, but the lack of knowledge on the fundamental nanoscale aspects of this process has made its understanding and prediction difficult, especially in a liquid phase. In this work, we successfully used liquid-phase transmission electron microscopy (LP-TEM) to image this process in real time at the nanometer scale, using an Au/TiO2 catalyst in the presence of NaCl(aq) as a case study. In situ LP-TEM clearly showed that the growth of Au nanoparticles occurred through a form of Ostwald ripening, whereby particles grew or disappeared, probably via monomer transfer, without clear correlation to particle size in contrast to predictions of classical Ostwald ripening models. In addition, the existence of a significant fraction of inert particles that neither grew nor shrank was observed. Furthermore, in situ transmission electron microscopy (TEM) showed that particle shrinkage was sudden and seemed a stochastic process, while particle growth by monomer attachment was slow and likely the rate-determining step for sintering in this system. Identification and understanding of these individual nanoparticle events are critical for extending the accuracy and predictive power of Ostwald ripening models for nanomaterials. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|