Formation of nanoclusters in expanding laser plume

E. G. Gamaly, N. R. Madsen, A. V. Rode, D. Golberg

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    Abstract

    Formation of carbon nanoclusters in a laser-pulse created plume expanding in vacuum and in a noble gas environment at various pressures was studied. Experiments were performed with carbon nanoclusters formed by laser ablation of graphite targets with 12-picosecond 532 nm laser pulses at MHz-range repetition rate in a broad range of ambient He, Ar, Kr, and Xe gas pressures from 2 × 10-2 Torr to 1500 Torr. The experimental results confirmed our theoretical prediction that the average size of the nanoparticles depends weakly on the type of the ambient gas, and is determined exclusively by the single-laser pulse parameters. The most important finding relates to the fact that in vacuum the cluster size is mainly determined by hydrodynamic expansion of the plume, while in the ambient gas it is controlled by atomic diffusion in the gas.

    Original languageEnglish
    Pages (from-to)371-375
    Number of pages5
    JournalInternational Journal of Nanoscience
    Volume9
    Issue number4
    DOIs
    Publication statusPublished - Aug 2010

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