Amorphization of Cu nanoparticles: Effects on surface plasmon resonance

H. Amekura*, B. Johannessen, D. J. Sprouster, M. C. Ridgway

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    14 Citations (Scopus)

    Abstract

    Crystalline copper nanoparticles (NPs) were formed in silica by multi-energy MeV ion implantations and then transformed to amorphous NPs by irradiation with 5 MeV Sn3+ ions. Optical absorption spectra of both the phases were evaluated in the ultra-violet to near-infrared regions. Compared with corresponding crystalline NPs of the same mean diameter, the amorphous NPs showed a low-energy shift of the surface plasmon resonance around 2.2 eV and less prominent absorption structure around 4 eV. These differences are explained by a strongly reduced electron mean-free-path in the amorphous NPs due to the loss of lattice periodicity.

    Original languageEnglish
    Article number043102
    JournalApplied Physics Letters
    Volume99
    Issue number4
    DOIs
    Publication statusPublished - 25 Jul 2011

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