Core-shell Nanoparticles Prepared in Superfluid Helium Droplets: Structure and Phase Transitions Studied at Atomic Resolution

Research output: Contribution to conferenceAbstractResearchpeer-review

Abstract

In our labs, superfluid droplets of 106 to 1010 helium atoms (HeN) are doped with foreign atoms or molecules that can form
complexes in this cold environment. In this way, large Cu, Ag, Au, Ni, Pd, and Cr aggregates of different morphology are
generated and deposited on solid carbon, BN, or SiN substrates. Employing different pick-up cells for doping the droplets,
nanowires of 2 to 5 nm diameter and around 100 nm length, as well as core-shell clusters with one metal surrounding a
core of a different species are produced. After surface deposition, the samples are removed and various measurement
techniques are applied to characterize the created particles: scanning electron microscopy at atomic resolution, electron
tomography, temperature dependent SEM and TEM up to 1000 degree C, energy-dispersive x-ray spectroscopy (EDXS),
electron energy loss spectroscopy (EELS) and optical absorption. By varying the contents of different metals in core-shell
particles, we can tune the plasmon resonance. Furthermore, results of our investigation of the thermal behaviour of
deposited nanoparticles and the corresponding phase changes on the nanoscale will be reported.
Original languageEnglish
Pages136
Publication statusPublished - 26 Mar 2018
EventBIT´s 6th Annual Conference of AnalytiX-2018: Faster, More Accurate, More Sensitive - Miami Marriott Dadeland, Miami, United States
Duration: 26 Mar 201828 Mar 2018
Conference number: 6
http://www.bitcongress.com/analytix2018/

Conference

ConferenceBIT´s 6th Annual Conference of AnalytiX-2018
CountryUnited States
CityMiami
Period26/03/1828/03/18
Internet address

Fields of Expertise

  • Advanced Materials Science

Cite this

Ernst, W. E. (2018). Core-shell Nanoparticles Prepared in Superfluid Helium Droplets: Structure and Phase Transitions Studied at Atomic Resolution. 136. Abstract from BIT´s 6th Annual Conference of AnalytiX-2018, Miami, United States.

Core-shell Nanoparticles Prepared in Superfluid Helium Droplets: Structure and Phase Transitions Studied at Atomic Resolution. / Ernst, Wolfgang E.

2018. 136 Abstract from BIT´s 6th Annual Conference of AnalytiX-2018, Miami, United States.

Research output: Contribution to conferenceAbstractResearchpeer-review

Ernst, WE 2018, 'Core-shell Nanoparticles Prepared in Superfluid Helium Droplets: Structure and Phase Transitions Studied at Atomic Resolution' BIT´s 6th Annual Conference of AnalytiX-2018, Miami, United States, 26/03/18 - 28/03/18, pp. 136.
Ernst WE. Core-shell Nanoparticles Prepared in Superfluid Helium Droplets: Structure and Phase Transitions Studied at Atomic Resolution. 2018. Abstract from BIT´s 6th Annual Conference of AnalytiX-2018, Miami, United States.
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N2 - In our labs, superfluid droplets of 106 to 1010 helium atoms (HeN) are doped with foreign atoms or molecules that can formcomplexes in this cold environment. In this way, large Cu, Ag, Au, Ni, Pd, and Cr aggregates of different morphology aregenerated and deposited on solid carbon, BN, or SiN substrates. Employing different pick-up cells for doping the droplets,nanowires of 2 to 5 nm diameter and around 100 nm length, as well as core-shell clusters with one metal surrounding acore of a different species are produced. After surface deposition, the samples are removed and various measurementtechniques are applied to characterize the created particles: scanning electron microscopy at atomic resolution, electrontomography, temperature dependent SEM and TEM up to 1000 degree C, energy-dispersive x-ray spectroscopy (EDXS),electron energy loss spectroscopy (EELS) and optical absorption. By varying the contents of different metals in core-shellparticles, we can tune the plasmon resonance. Furthermore, results of our investigation of the thermal behaviour ofdeposited nanoparticles and the corresponding phase changes on the nanoscale will be reported.

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