Superhard silicon nanospheres

W. W. Gerberich, W. M. Mook, C. R. Perrey, C. B. Carter, M. I. Baskes, R. Mukherjee, A. Gidwani, J. Heberlein, P. H. McMurry, S. L. Girshick

Research output: Contribution to journalArticlepeer-review

190 Scopus citations

Abstract

Successful deposition and mechanical probing of nearly spherical, defect-free silicon nanospheres has been accomplished. The results show silicon at this length scale to be up to four times harder than bulk silicon. Detailed measurements of plasticity evolution and the corresponding hardening response in normally brittle silicon is possible in these small volumes. Based upon a proposed length scale related to the size of nanospheres in the 20-50 nm radii range, a prediction of observed hardnesses in the range of 20-50 GPa is made. The ramifications of this to computational materials science studies on identical volumes are discussed.

Original languageEnglish (US)
Pages (from-to)979-992
Number of pages14
JournalJournal of the Mechanics and Physics of Solids
Volume51
Issue number6
DOIs
StatePublished - Jun 2003

Bibliographical note

Funding Information:
This work was supported by the National Science Foundation under grant DMI-0103169 and an NSF-IGERT program through grant DGE-0114372 and the USDOE Office of Science.

Keywords

  • A. Dislocations
  • A. Indentation and hardness
  • A. Strengthening and mechanisms

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