Formation of bimetallic core-shell nanowires along vortices in superfluid He nanodroplets

Thaler, Philipp; Volk, Alexander; Lackner, Florian; Steurer, Johannes; Knez, Daniel; Grogger, Werner; Hofer, Ferdinand; Ernst, Wolfgang

doi:10.1103/physrevb.90.155442

Cited by 69 publications

(96 citation statements)

References 39 publications

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“…The experimental parameters and setup can be used to tune the mean cluster size and composition 19 to favour either single-or multicore clustering and thereby customize the clusters' properties, such as their optical response 20 . In even larger droplets than investigated here, gold and silver can potentially condensate independently inside the droplet 6 .…”

Section: Resultsmentioning

confidence: 99%

Formation of bimetallic clusters in superfluid helium nanodroplets analysed by atomic resolution electron tomography

Haberfehlner

Thaler

Knez

et al. 2016

European Microscopy Congress 2016: Proceedings

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Structure, shape and composition are the basic parameters responsible for properties of nanoscale materials, distinguishing them from their bulk counterparts. To reveal these in three dimensions at the nanoscale, electron tomography is a powerful tool. Advancing electron tomography to atomic resolution in an aberration-corrected transmission electron microscope remains challenging and has been demonstrated only a few times using strong constraints or extensive filtering. Here we demonstrate atomic resolution electron tomography on silver/gold core/shell nanoclusters grown in superfluid helium nanodroplets. We reveal morphology and composition of a cluster identifying gold-and silver-rich regions in three dimensions and we estimate atomic positions without using any prior information and with minimal filtering. The ability to get full three-dimensional information down to the atomic scale allows understanding the growth and deposition process of the nanoclusters and demonstrates an approach that may be generally applicable to all types of nanoscale materials.

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Section: Resultsmentioning

confidence: 99%

Formation of bimetallic clusters in superfluid helium nanodroplets analysed by atomic resolution electron tomography

Haberfehlner

Thaler

Knez

et al. 2016

European Microscopy Congress 2016: Proceedings

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“…1,6,8,10,12 There is also a close analogy between our observations and the results of the experiments involving superfluid He microdroplets. [14][15][16] It was argued that in bulk superfluid He and in He microdroplets the nanowires are formed due to the trapping of the impurity atoms at the cores of quantized vortices. Most likely, quantized vortices are also present in our sample cell under the typical experimental conditions.…”

Section: Discussionmentioning

confidence: 99%

“…It was therefore suggested that in superfluid He both, hydrogen filaments 3,5 and metallic nanowires 6,7 are formed due to the aggregation of dopants trapped at the vortex core. Currently, most publications on this quickly growing field of research support that interpretation, 10,[14][15][16]20 both for bulk superfluid He and for He microdroplets. The interest in this phenomenon is twofold.…”

Section: Introductionmentioning

confidence: 99%

Metallic nanowires and mesoscopic networks on a free surface of superfluid helium and charge-shuttling across the liquid–gas interface

Moroshkin

Batulin

Leiderer

et al. 2016

Phys. Chem. Chem. Phys.

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We investigate the motion of electrically charged metallic nano-and microparticles produced by laser ablation in He gas and injected into superfluid helium. In the presence of a vertical static electric field, the particles either perform a repetitive shuttle-like motion transporting the charge across the liquid-gas interface or become trapped under the free surface of liquid He and coalesce into long filaments and complex two-dimensional mesoscopic networks. A classical electrohydrodynamic model is used to describe the motion of charged microparticles in superfluid He. The resulting filaments and networks are analyzed using electron microscopy. It is demonstrated that each filament is in fact composed of a large number of nanowires with a characteristic diameter of order of 10 nm and extremely large aspect ratios.

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“…However, these experiments were insensitive to the rotational excitation of the host droplets. Ex-situ transmission electron microscopy studies of metallic dopant residues deposited on a carbon foil by droplet impact uncovered the formation of metal nanowires in 1-μm-sized 4 He droplets, a phenomenon ascribed to aggregation of metal clusters along the cores of quantum vortices [6,[8][9]. Very recently, ultrafast single-shot X-ray diffraction imaging of Xe doped He droplets employing an X-ray free electron laser (XFEL) revealed Bragg spots, confirming the existence of quantum vortex lattices that enabled the condensation of 100-200 Xe clusters in a periodic array [10].…”

Section: Main Textmentioning

confidence: 99%

“…The determination of N Xe is described in the supplemental material (SM) [15]. Following capture by the droplet, Xe atoms cluster along the vortex cores [8][9][10]16] and act as a contrast agent. Further downstream, the droplet beam crossed the XFEL beam near the focus (≈5 µm diameter) of the AMO beamline at the Linac Coherent Light Source (LCLS) [17][18].…”

Section: Main Textmentioning

confidence: 99%

Coupled motion of Xe clusters and quantum vortices in He nanodroplets

Jones¹,

Bernando²,

Tanyag³

et al. 2016

Phys. Rev. B

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Single He nanodroplets doped with Xe atoms are studied via ultrafast coherent x-ray diffraction imaging. The diffraction images show that rotating He nanodroplets about 200 nm in diameter contain a small number of symmetrically arranged quantum vortices decorated with Xe clusters. Unexpected large distances of the vortices from the droplet center (≈0.7–0.8 droplet radii) are explained by a significant contribution of the Xe dopants to the total angular momentum of the droplets and a stabilization of widely spaced vortex configurations by the trapped Xe clusters

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Formation of bimetallic core-shell nanowires along vortices in superfluid He nanodroplets

Cited by 69 publications

References 39 publications

Formation of bimetallic clusters in superfluid helium nanodroplets analysed by atomic resolution electron tomography

Formation of bimetallic clusters in superfluid helium nanodroplets analysed by atomic resolution electron tomography

Metallic nanowires and mesoscopic networks on a free surface of superfluid helium and charge-shuttling across the liquid–gas interface

Coupled motion of Xe clusters and quantum vortices in He nanodroplets

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