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Size-Dependent Deformation of Nanocrystalline Pt Nanopillars

Gu, X. Wendy and Loynachan, Colleen N. and Wu, Zhaoxuan and Zhang, Yong-Wei and Srolovitz, David J. and Greer, Julia R. (2012) Size-Dependent Deformation of Nanocrystalline Pt Nanopillars. Nano Letters, 12 (12). pp. 6385-6392. ISSN 1530-6984.

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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.

Item Type:Article
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Greer, Julia R.0000-0002-9675-1508
Additional Information:© 2012 American Chemical Society. Received: October 5, 2012; Revised: November 11, 2012; Published: November 13, 2012. J.R.G. and X.W.G. acknowledges support from NSF Career Grant (DMR-0748267) and the Office of Naval Research (N00014-09-1-0883). X.W.G. acknowledges support from the National Defense Science and Engineering Graduate (NDSEG) Fellowship, 32 CFR 168a. X.W.G. and J.R.G. would also like to thank the Kavli Nanoscience Institute at Caltech for support and access to critical cleanroom facilities, Dr. Dongchan Jang for TEM assistance, and Dr. Qiang Guo for electroplating templates.
Group:Kavli Nanoscience Institute
Funding AgencyGrant Number
Office of Naval Research (ONR)N00014-09-1-0883
National Defense Science and Engineering Graduate (NDSEG) Fellowship32 CFR 168a
Kavli Nanoscience InstituteUNSPECIFIED
Issue or Number:12
Record Number:CaltechAUTHORS:20130107-104520272
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Official Citation:Size-Dependent Deformation of Nanocrystalline Pt Nanopillars X. Wendy Gu, Colleen N. Loynachan, Zhaoxuan Wu, Yong-Wei Zhang, David J. Srolovitz, and Julia R. Greer Nano Letters 2012 12 (12), 6385-6392
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:36202
Deposited By: Jason Perez
Deposited On:07 Jan 2013 21:06
Last Modified:03 Oct 2019 04:35

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