Geometry and surface state effects on the mechanical response of Au nanostructures

William M. Mook, John M. Jungk, Megan J. Cordill, Neville R. Moody, Yugang Sun, Younan Xia, William W. Gerberich

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

A study of ultra-thin gold films and thin-walled nanoboxes has confirmed that length scales in terms of dislocation spacing can predict flow stress. Initial stages of deformation conform to linear hardening with average dislocation spacing controlled by the number of geometrically necessary dislocations in a pile-up. Later stages of deformation exhibit parabolic behavior with Taylor hardening interpreted in terms of a dislocation density described by the total line length of prismatic loops per unit volume. Comparisons of 20 and 40 nm thick planar films could be made to 205 nm high hollow gold nanoboxes with a wall thickness of 24 nm. These highly constrained, ultra-thin planar films demonstrated increased hardness from about 2 to 10 GPa with strains of 20 percent while less constrained nanoboxes increased from 0.8 to 4 GPa for the same strain magnitude.

Original languageEnglish (US)
Pages (from-to)416-424
Number of pages9
JournalZeitschrift fuer Metallkunde/Materials Research and Advanced Techniques
Volume95
Issue number6
DOIs
StatePublished - Jun 2004

Keywords

  • Dislocation
  • Hardness
  • Length scale
  • Nanostructure

Fingerprint Dive into the research topics of 'Geometry and surface state effects on the mechanical response of Au nanostructures'. Together they form a unique fingerprint.

Cite this