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Ostwald ripening of charged supported metal nanoparticles: Schottky model

Vladimir P. Zhdanov (Institutionen för teknisk fysik, Kemisk fysik)
Physica E-Low-Dimensional Systems & Nanostructures (1386-9477). Vol. 71 (2015), p. 130-133.
[Artikel, refereegranskad vetenskaplig]

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 nano particles. 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.

Nyckelord: Supported metal nanoparticles, Sintering, Metal-semiconductor interface, Charge transfer, Catalysis



Denna post skapades 2015-06-09.
CPL Pubid: 218125

 

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Institutioner (Chalmers)

Institutionen för teknisk fysik, Kemisk fysik (1900-2015)

Ämnesområden

Katalys
Nanoteknik

Chalmers infrastruktur