Preparation of Ultrathin Nanowires Using Superfluid Helium Droplets

Latimer, Elspeth; Spence, D.; Cheng, Feng; Boatwright, Adrian; Ellis, Andrew M.; Yang, Shengfu

doi:10.1021/nl500946u

Cited by 79 publications

(76 citation statements)

References 50 publications

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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: 90%

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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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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 90%

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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“…Upon impact, the helium atoms evaporate while the Ag atoms remain on the surface keeping their "in situ" cluster structure, revealing a filamentlike distribution corresponding to the vortex line they were originally attached to inside the droplet. Experiments for other atomic impurities have been recently conducted, where the presence of vortex lines in helium droplets has been exploited to guide the formation of ultrathin nanowires [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Picosecond solvation dynamics of alkali cations in superfluidHe4nanodroplets

et al. 2014

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The dynamics following the photoionization of neutral Rb and Cs atoms residing in a dimple at the surface of a superfluid 4 He 1000 nanodroplet has been investigated within time-dependent density functional theory, complementing a previous study on Ba. The calculations reveal that structured high density helium solvation layers form around both the Rb + and Cs + cation on a picosecond time scale, forming so-called snowballs. In contrast to the Rb + ion, Cs + is not solvated by the 4 He 1000 droplet but rather desorbs from it as a Cs + He n snowball.This outcome is partially related to the large size of Cs + cation in relation to the helium droplet as is revealed by calculations performed using a planar helium surface. The large droplet deformations induced by the solvation of the Rb + cation is found to lead to efficient nucleation of quantized vortex loops or rings.

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“…In previous experiments no elongated nanoparticles have been observed in helium droplets composed of <10 6 helium atoms, [31][32][33] suggesting that quantized vortices, even if they exist, do not have significant influence on the clustering of H2TPyP and Au in this work. Therefore, the formation of Au-H2TPyP complexes is presumably driven by intermolecular forces.…”

Section: H2tpyp/au Complexesmentioning

confidence: 39%

Formation of Au and tetrapyridyl porphyrin complexes in superfluid helium

Cheng

Latimer

Spence

et al. 2015

Phys. Chem. Chem. Phys.

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Binary clusters containing a large organic molecule and metal atoms have been formed by the co-addition of 5,10,15,20-Tetra(4-pyridyl)porphyrin (H2TPyP) molecules and gold atoms to superfluid helium nanodroplets, and the resulting complexes were then investigated by electron impact mass spectrometry. In addition to the parent ion H2TPyP yields fragments mainly from pyrrole, pyridine and methylpyridine ions because of the stability of their ring structures. When Au is co-added to the droplets the mass spectra are dominated by H2TPyP fragment ions with one or more Au atoms attached. We also show that by switching the order in which Au and H2TPyP are added to the helium droplets, different types of H2TPyP/Au complexes are clearly evident from the mass spectra. This study suggests a new route for the control over the growth of metal-organic compounds inside superfluid helium nanodroplets.3

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Preparation of Ultrathin Nanowires Using Superfluid Helium Droplets

Cited by 79 publications

References 50 publications

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

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

Picosecond solvation dynamics of alkali cations in superfluidHe4nanodroplets

Formation of Au and tetrapyridyl porphyrin complexes in superfluid helium

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