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

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

Publikation: Beitrag in einer FachzeitschriftArtikel

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.].

Originalspracheenglisch
Aufsatznummer104
FachzeitschriftThe European physical journal / D
Jahrgang73
Ausgabenummer5
DOIs
PublikationsstatusVeröffentlicht - 21 Mai 2019

ASJC Scopus subject areas

  • !!Atomic and Molecular Physics, and Optics

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