Ultra-thin h-BN substrates for nanoscale plasmon spectroscopy

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Abstract

Probing plasmonic properties of surface deposited nanoparticles with high spatial resolution requires the use of a low absorption support. In this work, ultra-thin hexagonal boron nitride (h-BN) flakes are employed as substrates for scanning transmission electron microscopy. The thicknesses of only a few atomic layers, the flat surface, and the large bandgap provide a unique set of properties, which makes h-BN ideally suitable for high resolution plasmon spectroscopy by means of electron energy loss spectroscopy (EELS), especially for small nanoparticles. A facile fabrication process allows the production of h-BN substrates with a thickness of only a few atomic layers. The advantages of h-BN, especially for the low-loss energy region of EEL spectra, are shown in a direct comparison with a silicon nitride substrate. Furthermore, results of the investigation of localized surface plasmon resonances (LSPRs) of Ag and Ag-Au core-shell nanoparticles in the sub-20 nm size regime are presented, confirming the advantages of the fabricated substrate for LSPR mapping. The plasmonic nanoparticles were assembled utilizing the helium nanodroplet synthesis approach, which allows for a very soft deposition and the preservation of the integrity of the ultra-thin substrate. Moreover, it provides a completely solvent and surfactant free environment for the assembly of tailored nanoparticles.

Original languageEnglish
Article number023104
Pages (from-to)023104-1-023104-8
Number of pages9
JournalJournal of Applied Physics
Volume125
Issue number2
DOIs
Publication statusPublished - 2019

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boron nitrides
nanoparticles
spectroscopy
surface plasmon resonance
energy dissipation
high resolution
flakes
silicon nitrides
integrity
flat surfaces
assembly
spatial resolution
helium
surfactants
electron energy
transmission electron microscopy
fabrication
scanning electron microscopy
synthesis

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Fields of Expertise

  • Advanced Materials Science

Cite this

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title = "Ultra-thin h-BN substrates for nanoscale plasmon spectroscopy",
abstract = "Probing plasmonic properties of surface deposited nanoparticles with high spatial resolution requires the use of a low absorption support. In this work, ultra-thin hexagonal boron nitride (h-BN) flakes are employed as substrates for scanning transmission electron microscopy. The thicknesses of only a few atomic layers, the flat surface, and the large bandgap provide a unique set of properties, which makes h-BN ideally suitable for high resolution plasmon spectroscopy by means of electron energy loss spectroscopy (EELS), especially for small nanoparticles. A facile fabrication process allows the production of h-BN substrates with a thickness of only a few atomic layers. The advantages of h-BN, especially for the low-loss energy region of EEL spectra, are shown in a direct comparison with a silicon nitride substrate. Furthermore, results of the investigation of localized surface plasmon resonances (LSPRs) of Ag and Ag-Au core-shell nanoparticles in the sub-20 nm size regime are presented, confirming the advantages of the fabricated substrate for LSPR mapping. The plasmonic nanoparticles were assembled utilizing the helium nanodroplet synthesis approach, which allows for a very soft deposition and the preservation of the integrity of the ultra-thin substrate. Moreover, it provides a completely solvent and surfactant free environment for the assembly of tailored nanoparticles.",
author = "Alexander Schiffmann and Daniel Knez and Florian Lackner and Maximilian Lasserus and Roman Messner and Martin Schnedlitz and Gerald Kothleitner and Ferdinand Hofer and Ernst, {Wolfgang E.}",
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AU - Schiffmann, Alexander

AU - Knez, Daniel

AU - Lackner, Florian

AU - Lasserus, Maximilian

AU - Messner, Roman

AU - Schnedlitz, Martin

AU - Kothleitner, Gerald

AU - Hofer, Ferdinand

AU - Ernst, Wolfgang E.

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