The influence of laser-induced nanosecond rise-time stress waves on the microstructure and surface chemical activity of single crystal Cu nanopillars

G. Youssef, R. Crum, S. V. Prikhodko, D. Seif, G. Po, N. Ghoniem, S. Kodambaka, V. Gupta

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

An apparatus and test procedure for fabrication and loading of single crystal metal nanopillars under extremely high pressures (>1 GPa) and strain rates (>107 s-1), using laser-generated stress waves, are presented. Single-crystalline Cu pillars (∼1.20 μm in tall and ∼0.45 μm in diameter) prepared via focused ion beam milling of Cu(001) substrates are shock-loaded using this approach with the dilatational stress waves propagating along the [001] axis of the pillars. Transmission electron microscopy observations of shock-loaded pillars show that dislocation density decreases and that their orientation changes with increasing stress wave amplitude, indicative of dislocation motion. The shock-loaded pillars exhibit enhanced chemical reactivity when submerged in oil and isopropyl alcohol solutions, due likely to the exposure of clean surfaces via surface spallation and formation of surface steps and nanoscale facets through dislocation motion to the surface of the pillars, resulting in growth of thin oxide films on the surfaces of the pillars.

Original languageEnglish (US)
Article number084309
JournalJournal of Applied Physics
Volume113
Issue number8
DOIs
StatePublished - Feb 28 2013
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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