Highly Stable Monocrystalline Silver Clusters for Plasmonic Applications

Sergey Novikov, Vladimir Popok, A.V. Evlyukhin, Hanif Muhammad, Per Morgen, Jacek Fiutowski, Jonas Beermann, Horst-Günter Rubahn, Sergey Bozhevolnyi

Research output: Contribution to journalJournal articleResearchpeer-review

26 Citations (Scopus)

Abstract

Plasmonic sensor configurations utilizing localized plasmon resonances in silver nanostructures typically suffer from the rapid degradation of silver under ambient atmospheric conditions. In this work, we report on the fabrication and detailed characterization of ensembles of monocrystalline silver nanoparticles (NPs), which exhibit a long-term stability of optical properties under ambient conditions without any protective treatments. Ensembles with different densities (surface coverages) of size-selected NPs (mean diameters of 12.5 and 24 nm) on quartz substrates are fabricated using the cluster-beam technique and characterized by linear spectroscopy, two-photon-excited photoluminescence, surface-enhanced Raman scattering microscopy, and transmission electron, helium ion, and atomic force microscopies. It is found that the fabricated ensembles of monocrystalline silver NPs preserve their plasmonic properties (monitored with optical spectroscopy) and strong field enhancements (revealed by surface-enhanced Raman spectroscopy) at least 5 times longer as compared to chemically synthesized silver NPs with similar sizes. The obtained results are of high practical relevance for the further development of sensors, resonators, and metamaterials utilizing the plasmonic properties of silver NPs.
Original languageEnglish
JournalLangmuir
Volume33
Issue number24
Pages (from-to)6062-6070
Number of pages9
ISSN0743-7463
DOIs
Publication statusPublished - 15 May 2017

Keywords

  • silver clusters
  • localised surface plasmon resonance
  • surface-enhanced Raman spectroscopy

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