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Issue 38, 2012
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A thermodynamic perspective of the metastability of holey sheets: the role of curvature

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Abstract

Producing nanostructures with high surface area that are stable is important to accomplish sustained use of catalytic materials in practical settings. Avoiding the processes of ripening and sintering that typically hinder stability has long been recognized as a significant challenge and much research is focused on addressing these issues. In this article, we investigate a Pt nanostructure—a holey nanosheet—that exhibits high surface area and stability. The findings from lattice gas simulations produce a stability diagram that relates a critical hole diameter to sheet thickness. The stability is now addressed from a thermodynamic point of view, and, in particular, the crucial role of curvature is considered. We find that the stability of certain sized holes is due to the near zero mean curvature of the surface of the holes and of the surrounding flat sheet. Molecular dynamics simulations of Pt (using an embedded atom potential) are reported for small nanoclusters and model holes in sheets to illustrate the strong effects of curvature on thermodynamic properties such as the lowering of melting and surface melting temperatures.

Graphical abstract: A thermodynamic perspective of the metastability of holey sheets: the role of curvature

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Article information


Submitted
06 May 2012
Accepted
15 Aug 2012
First published
15 Aug 2012

Phys. Chem. Chem. Phys., 2012,14, 13309-13318
Article type
Paper

A thermodynamic perspective of the metastability of holey sheets: the role of curvature

F. van Swol, S. R. Challa and J. A. Shelnutt, Phys. Chem. Chem. Phys., 2012, 14, 13309
DOI: 10.1039/C2CP41446E

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