Deconfinement leads to changes in the nanoscale plasticity of silicon

Dariusz Chrobak, Natalia Tymiak, Aaron Beaber, Ozan Ugurlu, William W Gerberich, Roman Nowak

Research output: Contribution to journalArticle

85 Citations (Scopus)

Abstract

Silicon crystals have an important role in the electronics industry, and silicon nanoparticles have applications in areas such as nanoelectromechanical systems, photonics and biotechnology. However, the elastic-plastic transition observed in silicon is not fully understood; in particular, it is not known if the plasticity of silicon is determined by dislocations or by transformations between phases. Here, based on compression experiments and molecular dynamics simulations, we show that the mechanical properties of bulk silicon and silicon nanoparticles are significantly different. We find that bulk silicon exists in a state of relative constraint, with its plasticity dominated by phase transformations, whereas silicon nanoparticles are less constrained and display dislocation-driven plasticity. This transition, which we call deconfinement, can also explain the absence of phase transformations in deformed silicon nanowedges. Furthermore, the phenomenon is in agreement with effects observed in shape-memory alloy nanopillars, and provides insight into the origin of incipient plasticity.

Original languageEnglish (US)
Pages (from-to)480-484
Number of pages5
JournalNature Nanotechnology
Volume6
Issue number8
DOIs
StatePublished - Jan 1 2011

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Silicon
plastic properties
Plasticity
silicon
Nanoparticles
nanoparticles
phase transformations
Phase transitions
NEMS
biotechnology
Electronics industry
shape memory alloys
Biotechnology
Shape memory effect
Photonics
Molecular dynamics
plastics
industries
mechanical properties
photonics

Cite this

Chrobak, D., Tymiak, N., Beaber, A., Ugurlu, O., Gerberich, W. W., & Nowak, R. (2011). Deconfinement leads to changes in the nanoscale plasticity of silicon. Nature Nanotechnology, 6(8), 480-484. https://doi.org/10.1038/nnano.2011.118

Deconfinement leads to changes in the nanoscale plasticity of silicon. / Chrobak, Dariusz; Tymiak, Natalia; Beaber, Aaron; Ugurlu, Ozan; Gerberich, William W; Nowak, Roman.

In: Nature Nanotechnology, Vol. 6, No. 8, 01.01.2011, p. 480-484.

Research output: Contribution to journalArticle

Chrobak, D, Tymiak, N, Beaber, A, Ugurlu, O, Gerberich, WW & Nowak, R 2011, 'Deconfinement leads to changes in the nanoscale plasticity of silicon', Nature Nanotechnology, vol. 6, no. 8, pp. 480-484. https://doi.org/10.1038/nnano.2011.118
Chrobak D, Tymiak N, Beaber A, Ugurlu O, Gerberich WW, Nowak R. Deconfinement leads to changes in the nanoscale plasticity of silicon. Nature Nanotechnology. 2011 Jan 1;6(8):480-484. https://doi.org/10.1038/nnano.2011.118
Chrobak, Dariusz ; Tymiak, Natalia ; Beaber, Aaron ; Ugurlu, Ozan ; Gerberich, William W ; Nowak, Roman. / Deconfinement leads to changes in the nanoscale plasticity of silicon. In: Nature Nanotechnology. 2011 ; Vol. 6, No. 8. pp. 480-484.
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