Size-Dependent Deformation of Nanocrystalline Pt Nanopillars

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • X. Wendy Gu
  • Colleen N. Loynachan
  • Zhaoxuan Wu
  • Yong-Wei Zhang
  • Julia R. Greer

Detail(s)

Original languageEnglish
Pages (from-to)6385-6392
Journal / PublicationNano Letters
Volume12
Issue number12
Online published13 Nov 2012
Publication statusPublished - 12 Dec 2012
Externally publishedYes

Abstract

We report the synthesis, mechanical properties, and deformation mechanisms of polycrystalline, platinum nanocylinders of grain size d = 12 nm. The number of grains across the diameter, D/d, was varied from 5 to 80 and 1.5 to 5 in the experiments and molecular dynamics simulations, respectively. An abrupt weakening is observed at a small D/d, while the strengths of large nanopillars are similar to bulk. This "smaller is weaker" trend is opposite to the "smaller is stronger" size effect in single crystalline nanostructures. The simulations demonstrate that the size-dependent behavior is associated with the distinct deformation mechanisms operative in interior versus surface grains. © 2012 American Chemical Society.

Research Area(s)

  • mechanical properties, molecular dynamics, nanocrystalline, Size effect

Citation Format(s)

Size-Dependent Deformation of Nanocrystalline Pt Nanopillars. / Gu, X. Wendy; Loynachan, Colleen N.; Wu, Zhaoxuan; Zhang, Yong-Wei; Srolovitz, David J.; Greer, Julia R.

In: Nano Letters, Vol. 12, No. 12, 12.12.2012, p. 6385-6392.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review