Robust nanopatterning by laser-induced dewetting of metal nanofilms

Christopher Favazza, Ramki Kalyanaraman, Radhakrishna Sureshkumar

Research output: Contribution to journalArticle

141 Scopus citations

Abstract

We have observed nanopattern formation with robust and controllable spatial ordering by laser-induced dewetting in nanoscopic metal films. Pattern evolution in Co film of thickness 1≤h≤8nm on SiO2 was achieved under multiple pulse irradiation using a 9ns pulse laser. Dewetting leads to the formation of cellular patterns which evolve into polygons that eventually break up into nanoparticles with unimodal size distribution and short range ordering in nearest neighbour spacing R. Spatial ordering was attributed to a hydrodynamic thin film instability and resulted in a predictable variation of R and particle diameter D with h. The length scales R and D were found to be independent of the laser energy. These results suggest that spatially ordered metal nanoparticles can be robustly assembled by laser-induced dewetting.

Original languageEnglish (US)
Article number038
Pages (from-to)4229-4234
Number of pages6
JournalNanotechnology
Volume17
Issue number16
DOIs
StatePublished - Aug 28 2006
Externally publishedYes

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering

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