Continuous gas-phase synthesis of core–shell nanoparticles <i>via</i> surface segregation

Snellman, Markus; Eom, Namsoon; Ek, Martin; Messing, Maria E.; Deppert, Knut

doi:10.1039/d0na01061h

Cited by 37 publications

(35 citation statements)

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“…To demonstrate that the agglomeration is occurring on the fibers and not in the beam (as has been sometimes reported for this type of synthesis [ 47 , 48 ]), Figure 6 shows an SEM image of a lacy carbon TEM grid after passing the aerosol over it for 5 min in a similar manner to the samples prepared for the TEM images. Here it is observed that most of the coating is made of individual nanoparticles.…”

Section: Resultsmentioning

confidence: 94%

Effectiveness of Silver Nanoparticles Deposited in Facemask Material for Neutralising Viruses

et al. 2022

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Cloth used for facemask material has been coated with silver nanoparticles using an aerosol method that passes pure uncoated nanoparticles through the cloth and deposits them throughout the volume. The particles have been characterized by electron microscopy and have a typical diameter of 4 nm with the atomic structure of pure metallic silver presented as an assortment of single crystals and polycrystals. The particles adhere well to the cloth fibers, and the coating consists of individual nanoparticles at low deposition times, evolving to fully agglomerated assemblies in heavy coatings. The cloth was exposed to Usutu virus and murine norovirus particles in suspension and allowed to dry, following which, the infectious virus particles were rescued by soaking the cloth in culture media. It was found that up to 98% of the virus particles were neutralized by this contact with the silver nanoparticles for optimum deposition conditions. The best performance was obtained with agglomerated films and with polycrystalline nanoparticles. The work indicates that silver nanoparticles embedded in masks can neutralize the majority of virus particles that enter the mask and thus increase the opacity of masks to infectious viruses by up to a factor of 50. In addition, the majority of the virus particles released from the mask after use are non-infectious.

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Section: Resultsmentioning

confidence: 94%

Effectiveness of Silver Nanoparticles Deposited in Facemask Material for Neutralising Viruses

et al. 2022

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“…For the formation of Ag−Cu 3 P nanoparticle heterostructures, bimetallic Ag−Cu nanoparticles were generated in a spark ablation system, 55 and particles with a defined diameter of 30 nm were selected via an integrated filtering system for the deposition on a microelectromechanical systems (MEMS)-based heating chip for in situ TEM investigations. Subsequently, the chip was transferred to an ETEM with an integrated MOCVD system.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…A differential mobility analyzer system enabled the selection of sintered bimetallic nanoparticles with a diameter of 30 nm for the electrostatic deposition on MEMS-based heating chips. The parameters used for the synthesis and deposition of Ag–Cu nanoparticle heterostructures are in accordance with the parameters used in a recently published study …”

Section: Methodsmentioning

confidence: 99%

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Interface Dynamics in Ag–Cu₃P Nanoparticle Heterostructures

et al. 2021

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Earth-abundant transition metal phosphides are promising materials for energy-related applications. Specifically, copper(I) phosphide is such a material and shows excellent photocatalytic activity. Currently, there are substantial research efforts to synthesize well-defined metal–semiconductor nanoparticle heterostructures to enhance the photocatalytic performance by an efficient separation of charge carriers. The involved crystal facets and heterointerfaces have a major impact on the efficiency of a heterostructured photocatalyst, which points out the importance of synthesizing potential photocatalysts in a controlled manner and characterizing their structural and morphological properties in detail. In this study, we investigated the interface dynamics occurring around the synthesis of Ag–Cu3P nanoparticle heterostructures by a chemical reaction between Ag–Cu nanoparticle heterostructures and phosphine in an environmental transmission electron microscope. The major product of the Cu–Cu3P phase transformation using Ag–Cu nanoparticle heterostructures with a defined interface as a template preserved the initially present Ag{111} facet of the heterointerface. After the complete transformation, corner truncation of the faceted Cu3P phase led to a physical transformation of the nanoparticle heterostructure. In some cases, the structural rearrangement toward an energetically more favorable heterointerface has been observed and analyzed in detail at the atomic level. The herein-reported results will help better understand dynamic processes in Ag–Cu3P nanoparticle heterostructures and enable facet-engineered surface and heterointerface design to tailor their physical properties.

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“…In addition, spark ablation does not require a vacuum system and its electrical implementation is also simple, which facilitates scalable particle generation 22,23 . Moreover, due to the ability of periodically eroding two bulk electrodes with different compositions, spark ablation has utmost potential in the field of multielement NP synthesis with controllable composition and structure [24][25][26][27] . In the present paper we report on the spark ablation-based synthesis and characterization of Au/Co BNPs.…”

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confidence: 99%

Continuous spark plasma synthesis of Au/Co binary nanoparticles with tunable properties

Villy

Kohut

Kéri

et al. 2022

Sci Rep

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We present here a scalable and environmentally friendly gas phase technique employing atmospheric pressure electrical spark discharge plasmas for the production of Au/Co binaries, an effective catalyst system for the decomposition of hydrogen-rich compounds, such as ammonium borane. We demonstrate that Au/Co alloy nanoparticles can be produced via the spark plasma-based technique. The possibility of varying the morphology and phase structure via real time heat treatment of the generated aerosol to form Au/Co/CoO particles with continuous control over a wide particle compositional range (from 24 to 64 at.% [Co]/([Co] + [Au]) content) is also demonstrated. Since our spark-based approach is proven to be capable of providing reasonable particle yields, these results may contribute to the transition of lab-scale, nanocatalyst-based hydrogen storage systems to real world applications.

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Continuous gas-phase synthesis of core–shell nanoparticles via surface segregation

Abstract: Synthesis methods of highly functional core@shell nanoparticles with high throughput and high purity are in great demand for applications, including catalysis and optoelectronics. Traditionally chemical synthesis has been widely explored,...

Cited by 37 publications

References 92 publications

Effectiveness of Silver Nanoparticles Deposited in Facemask Material for Neutralising Viruses

Effectiveness of Silver Nanoparticles Deposited in Facemask Material for Neutralising Viruses

Interface Dynamics in Ag–Cu₃P Nanoparticle Heterostructures

Continuous spark plasma synthesis of Au/Co binary nanoparticles with tunable properties

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Continuous gas-phase synthesis of core–shell nanoparticles via surface segregation

Abstract: Synthesis methods of highly functional core@shell nanoparticles with high throughput and high purity are in great demand for applications, including catalysis and optoelectronics. Traditionally chemical synthesis has been widely explored,...

Cited by 37 publications

References 92 publications

Effectiveness of Silver Nanoparticles Deposited in Facemask Material for Neutralising Viruses

Effectiveness of Silver Nanoparticles Deposited in Facemask Material for Neutralising Viruses

Interface Dynamics in Ag–Cu3P Nanoparticle Heterostructures

Continuous spark plasma synthesis of Au/Co binary nanoparticles with tunable properties

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Product

Resources

About

Interface Dynamics in Ag–Cu₃P Nanoparticle Heterostructures