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@ARTICLE{Ristig:200836,
      author       = {Ristig, S. and Prymak, O. and Loza, K. and Gocyla, M. and
                      Meyer-Zaika, W. and Heggen, M. and Raabe, D. and Epple, M.},
      title        = {{N}anostructure of wet-chemically prepared,
                      polymer-stabilized silver–gold nanoalloys (6 nm) over the
                      entire composition range},
      journal      = {Journal of materials chemistry / B},
      volume       = {3},
      number       = {23},
      issn         = {2050-7518},
      address      = {London {[u.a.]},
      publisher    = {RSC},
      reportid     = {FZJ-2015-03216},
      pages        = {4654 - 4662},
      year         = {2015},
      abstract     = {Bimetallic silver–gold nanoparticles were prepared by
                      co-reduction using citrate and tannic acid in aqueous
                      solution and colloidally stabilized with
                      poly(N-vinylpyrrolidone) (PVP). The full composition range
                      of silver : gold from 0 : 100 to 100 : 0 (n : n) was
                      prepared with steps of 10 $mol\%.$ The nanoparticles were
                      spherical, monodispersed, and had a diameter of [similar]6
                      nm, except for Ag : Au 90 : 10 nanoparticles and pure Ag
                      nanoparticles which were slightly larger. The size of the
                      nanoalloys was determined by differential centrifugal
                      sedimentation (DCS) and transmission electron microscopy
                      (TEM). By means of X-ray powder diffraction (XRD) together
                      with Rietveld refinement, precise lattice parameters,
                      crystallite size and microstrain were determined. Scanning
                      transmission electron microscopy (STEM) combined with
                      energy-dispersive X-ray spectroscopy (EDX) and electron
                      energy loss spectroscopy (EELS) showed that the particles
                      consisted of a gold-rich core and a silver-rich shell. XRD
                      and DCS indicated that the nanoparticles were not twinned,
                      except for pure Ag and Ag : Au 90 : 10, although different
                      domains were visible in the TEM. A remarkable negative
                      deviation from Vegard's linear rule of alloy mixtures was
                      observed (isotropic contraction of the cubic unit cell with
                      a minimum at a 50 : 50 composition). This effect was also
                      found for Ag:Au bulk alloys, but it was much more pronounced
                      for the nanoalloys. Notably, it was much less pronounced for
                      pure silver and gold nanoparticles. The microstrain was
                      increased along with the contraction of the unit cell with a
                      broad maximum at a 50 : 50 composition. The synthesis is
                      based on aqueous solvents and can be easily scaled up to a
                      yield of several mg of a well dispersed nanoalloy with
                      application potential due to its tuneable antibacterial
                      action (silver) and its optical properties for bioimaging.},
      cin          = {PGI-5},
      ddc          = {540},
      cid          = {I:(DE-Juel1)PGI-5-20110106},
      pnm          = {143 - Controlling Configuration-Based Phenomena (POF3-143)},
      pid          = {G:(DE-HGF)POF3-143},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000355737600004},
      doi          = {10.1039/C5TB00644A},
      url          = {https://juser.fz-juelich.de/record/200836},
}