Size-Dependent Deformation of Nanocrystalline Pt Nanopillars
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.
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.Attached Files
Published - nl3036993.pdf
Supplemental Material - nl3036993_si_001.pdf
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Additional details
- Eprint ID
- 36202
- Resolver ID
- CaltechAUTHORS:20130107-104520272
- NSF
- DMR-0748267
- Office of Naval Research (ONR)
- N00014-09-1-0883
- National Defense Science and Engineering Graduate (NDSEG) Fellowship
- 32 CFR 168a
- Kavli Nanoscience Institute
- Created
-
2013-01-07Created from EPrint's datestamp field
- Updated
-
2021-11-09Created from EPrint's last_modified field
- Caltech groups
- Kavli Nanoscience Institute