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Knut Deppert

Knut Deppert


Knut Deppert

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


  • Knut Deppert
  • Namsoon Eom
  • Markus Snellman
  • Martin Ek
  • Maria Messing

Summary, in English

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,
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.


  • Solid State Physics
  • NanoLund
  • Centre for Analysis and Synthesis
  • Synchrotron Radiation Research

Publishing year




Document type

Conference paper: abstract


  • Nano Technology

Conference name

37th Annual Meet of the American Association for Aerosol Research

Conference date

2019-10-14 - 2019-10-18

Conference place

Portland, United States