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One-step Gas-phase Synthesis of Core-shell Nanoparticles via Surface Segregation.

Deppert, Knut LU orcid ; Eom, Namsoon LU ; Snellman, Markus LU ; Ek, Martin LU orcid and Messing, Maria LU (2019) 37th Annual Meet of the American Association for Aerosol Research
Abstract
A great amount of research effort has been devoted to the
production of core-shell nanoparticles for applications in various
fields including biomedical imaging, catalysis, and plasmonics.
Such attention to core-shell nanoparticles arise from the fact that
they can exhibit enhanced physical and/or chemical properties.
Furthermore, core-shell particles with distinctly new properties
compared to those of the constituent materials can be designed
by tuning, for example, their size, shell thickness, and structure [1,
2].
Although chemical synthesis techniques are currently the most
popular methods for fabricating core-shell nanoparticles,
interface and surface contaminations are often an... (More)
A great amount of research effort has been devoted to the
production of core-shell nanoparticles for applications in various
fields including biomedical imaging, catalysis, and plasmonics.
Such attention to core-shell nanoparticles arise from the fact that
they can exhibit enhanced physical and/or chemical properties.
Furthermore, core-shell particles with distinctly new properties
compared to those of the constituent materials can be designed
by tuning, for example, their size, shell thickness, and structure [1,
2].
Although chemical synthesis techniques are currently the most
popular methods for fabricating core-shell nanoparticles,
interface and surface contaminations are often an unavoidable
issue in the solution-based approaches. Aerosol based methods
are cleaner alternatives and have been used to produce core-shell
nanoparticles [3-6]. Here we present aerosol core-shell
nanoparticles generated via spark discharge generation (SDG) [7].
Cu-Ag core shell nanoparticles were fabricated via surface
segregation using SDG accompanied by sintering directly in the
gas phase. The surface segregation employed in this method
refers to the phenomenon of the enrichment of one component
of a mixture in the surface region and is attributed to the
interplay between the atomic radii, cohesive energy, and surface
energy of the core and shell materials [8].
Depending on the sintering temperature, the SDG-generated
nanoparticles form Janus-like or core-shell structures. The
morphology, crystallinity, and composition of the SDG-generated
bimetallic nanoparticles were investigated by scanning electron
microscopy, high-resolution transmission electron microscopy,
and energy-dispersive X-ray spectroscopy. Molecular dynamics
simulations were carried out to investigate the structural
evolution of Cu-Ag nanoparticles during heating and cooling
processes corresponding to the sintering. This appealingly simple
one-step gas-phase synthesis method presented here can be
employed for other bimetallic systems. (Less)
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author
; ; ; and
organization
publishing date
type
Contribution to conference
publication status
published
subject
conference name
37th Annual Meet of the American Association for Aerosol Research
conference location
Portland, United States
conference dates
2019-10-14 - 2019-10-18
project
Aerosol Synthesis and Characterization of Heterogeneous Bimetallic Nanoparticles
language
Swedish
LU publication?
yes
id
726ad51f-5038-4b2d-9b95-755a3dd5a0e4
date added to LUP
2020-11-30 10:20:56
date last changed
2022-04-05 15:02:30
@misc{726ad51f-5038-4b2d-9b95-755a3dd5a0e4,
  abstract     = {{A great amount of research effort has been devoted to the<br/>production of core-shell nanoparticles for applications in various<br/>fields including biomedical imaging, catalysis, and plasmonics.<br/>Such attention to core-shell nanoparticles arise from the fact that<br/>they can exhibit enhanced physical and/or chemical properties.<br/>Furthermore, core-shell particles with distinctly new properties<br/>compared to those of the constituent materials can be designed<br/>by tuning, for example, their size, shell thickness, and structure [1,<br/>2].<br/>Although chemical synthesis techniques are currently the most<br/>popular methods for fabricating core-shell nanoparticles,<br/>interface and surface contaminations are often an unavoidable<br/>issue in the solution-based approaches. Aerosol based methods<br/>are cleaner alternatives and have been used to produce core-shell<br/>nanoparticles [3-6]. Here we present aerosol core-shell<br/>nanoparticles generated via spark discharge generation (SDG) [7].<br/>Cu-Ag core shell nanoparticles were fabricated via surface<br/>segregation using SDG accompanied by sintering directly in the<br/>gas phase. The surface segregation employed in this method<br/>refers to the phenomenon of the enrichment of one component<br/>of a mixture in the surface region and is attributed to the<br/>interplay between the atomic radii, cohesive energy, and surface<br/>energy of the core and shell materials [8].<br/>Depending on the sintering temperature, the SDG-generated<br/>nanoparticles form Janus-like or core-shell structures. The<br/>morphology, crystallinity, and composition of the SDG-generated<br/>bimetallic nanoparticles were investigated by scanning electron<br/>microscopy, high-resolution transmission electron microscopy,<br/>and energy-dispersive X-ray spectroscopy. Molecular dynamics<br/>simulations were carried out to investigate the structural<br/>evolution of Cu-Ag nanoparticles during heating and cooling<br/>processes corresponding to the sintering. This appealingly simple<br/>one-step gas-phase synthesis method presented here can be<br/>employed for other bimetallic systems.}},
  author       = {{Deppert, Knut and Eom, Namsoon and Snellman, Markus and Ek, Martin and Messing, Maria}},
  language     = {{swe}},
  title        = {{One-step Gas-phase Synthesis of Core-shell Nanoparticles via Surface Segregation.}},
  year         = {{2019}},
}