Abstracts Book - IMRC 2018

• SA2-O020 Invited Talk
SYNTHESIS OF MAGNETIC NANOALLOYS BY PULSED LASER
ABLATION IN LIQUIDS
Bilal Gökce 1 , Stephan Barcikowski 1
1 Universität Duisburg-Essen, Chemistry, Germany.
Magnetic nanoalloys have attracted widespread interest over the past decades,
in particular, because of their promising applications in biomedicine, magnetic
resonance imaging, and optics. Typical synthesis methods of magnetic
nanoalloys are complex and hard to control requiring time-consuming postprocessing
steps.
In this contribution, pulsed laser ablation in liquids (PLAL) is introduced as an
alternative method for the synthesis of magnetic alloy nanoparticles [1]. It
particularly excels in its material variety- basically, any alloy material available as
a bulk can be transformed into nanoparticles. This variety can be further
extended by using mixed micropowders as target materials which allows almost
unlimited flexibility [2]. Also, alloy nanoparticles derived PLAL carry no organic
stabilizer ligands, which makes the derived ligand-free alloy nanoparticles
excellent reference materials for the verification of theoretical studies on nanoalloys.
PLAL was successfully applied to magnetic materials that are not, or only
partially miscible in the solid state, e.g., in the case of the iron-gold system. Here,
clear elemental segregation and a unique core-shell structure could be found,
while, interestingly, the internal phase structure was ruled by the used solvent
[3], the target composition and the particle size. Further examples that will be
discussed in this talk include iron-nickel [4] and iron-manganese nanoalloys [5]
as well as magnetic high entropy alloys.
[1] D. Zhang, B. Gökce, S. Barcikowski, Chem. Rev., 2017, 117, 3990-4103.
[2] T. Schmitz, U. Wiedwald, C. Dubs, B. Gökce, ChemPhysChem, 2017, 18, 1125
-1132.
[3] P. Wagener, J. Jakobi, C. Rehbock, V. S. K. Chakravadhanula, C. Thede, U.
Wiedwald, M. Bartsch, L. Kienle and S. Barcikowski, Sci. Rep., 2016, 6, 12.
[4] S. Barcikowski, T. Baranowski, Y. Durmus, U. Wiedwald, B. Gökce, J. Mater.
Chem. C , 2015, 3, 10699-10704.