Helium nanodroplet assisted synthesis of bimetallic Ag@Au nanoparticles with tunable localized surface plasmon resonance

Florian Lackner*, Alexander Schiffmann, Maximillian Lasserus, Roman Messner, Martin Schnedlitz, Harald Fitzek, Peter Pölt, Daniel Knez, Gerald Kothleitner, Wolfgang E. Ernst

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Abstract: Nanoparticles with tunable localized surface plasmon resonance have been prepared by synthesis in helium nanodroplets. Subsequent surface deposition allows for the formation of substrates which can be employed for surface-enhanced Raman spectroscopy (SERS). The assembly of Ag@Au core@shell clusters of about 5 nm diameter in helium droplets with different Ag:Au ratio allows to tune the surface plasmon resonance between the plain Ag resonance at 447 nm and the Au resonance at 555 nm. For the fabricated substrates only a single plasmon resonance is observed in the UV/vis absorption spectra. The prepared nanostructures have been functionalized with 4-methylbenzenethiol (4-MBT) molecules and SERS spectra have been recorded. The results demonstrate the potential of the helium droplet synthesis approach, opening up a new route to the formation of tailored plasmonic nanoparticles and functional nanostructures. Graphical abstract: [Figure not available: see fulltext.].

Original languageEnglish
Article number104
JournalEuropean Physical Journal D
Volume73
Issue number5
DOIs
Publication statusPublished - 1 May 2019

Keywords

  • Clusters and Nanostructures

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Fields of Expertise

  • Advanced Materials Science

Cooperations

  • NAWI Graz

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