Applied Physics A

, Volume 83, Issue 3, pp 341–346

Formation of silicon nanoparticles and web-like aggregates by femtosecond laser ablation in a background gas

  • B.R. Tull
  • J.E. Carey
  • M.A. Sheehy
  • C. Friend
  • E. Mazur
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Abstract

We show that the mechanism of nanoparticle formation during femtosecond laser ablation of silicon is affected by the presence of a background gas. Femtosecond laser ablation of silicon in a H2 or H2S background gas yields a mixture of crystalline and amorphous nanoparticles. The crystalline nanoparticles form via a thermal mechanism of nucleation and growth. The amorphous material has smaller features and forms at a higher cooling rate than the crystalline nanoparticles. The background gas also results in the suspension of plume material in the gas for extended periods, resulting in the formation (on a thin film carbon substrate) of unusual aggregated structures including nanoscale webs that span tears in the film. The presence of a background gas provides additional control of the structure and composition of the nanoparticles during short pulse laser ablation.

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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • B.R. Tull
    • 1
  • J.E. Carey
    • 1
  • M.A. Sheehy
    • 2
  • C. Friend
    • 1
    • 2
  • E. Mazur
    • 1
  1. 1.Division of Engineering and Applied SciencesHarvard UniversityCambridgeUSA
  2. 2.Department of Chemistry and Chemical BiologyHarvard UniversityCambridgeUSA

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