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Talks and Poster Presentations (with Proceedings-Entry):

M. Weiss, C. Riedl, H. Riedl, J. Frank, P.H. Mayrhofer, J. Fleig, A. Limbeck:
"Online Laser Ablation of solids in Liquids (LASIL) as a versatile tool for quantitative thin film analysis";
Talk: AOFKA - Applied Surface and Solid State Analytics, Freiberg; 2021-10-06 - 2021-10-08; in: "Scientific program - Abstracts", (2021), 27.



English abstract:
The recently introduced online Laser Ablation of solids in Liquids (online-LASIL) technique allows to combine the advantages of direct solid sampling with those of liquid measurements. In LASIL the sample is ablated by a laser beam in a flow of a liquid medium, the ablated material is carried by the fluid into the sample inlet of an ICP-MS or ICP-OES. As liquid standards can be injected into the carrier solution, it is possible to assess the composition of the sample without the need of matrix matched standards. A further advantage is that the depth resolution accessible with LASIL is better than with conventional nanosecond laser ablation. This benefit is demonstrated by analysis of two different samples from the field of material science.
The first is the quantification of the surface platinum concentration on a mixed ionic electronic conductor (MIEC). These materials serve as cathode materials for solid oxide fuel cells (SOFC). Recently it was shown that the deposition of platinum nanoparticles on the surface can increase the electrochemical performance of lanthanum strontium iron oxide (LSF). As these samples not only have platinum on their surface but contain also a current collector made of platinum beneath the MIEC, an analytical method with a sufficient depth resolution is required to separate these two layers of platinum. It is shown that online-LASIL is capable of performing this task and provides the required information about the deposited amount of platinum. Moreover, imaging experiments were performed to monitor the homogeneity of the platinum decoration.
As second example serve boride based hard materials, which were used as protective coatings to enhance the erosion resistance of cutting and machining tools. As the properties of the applied coating changes substantially with composition, reliable analysis of the materials stoichiometry is necessary to ensure the aspired protective effect. Here the flexibility of online-LASIL allows to determine the exact composition of several material systems without the need for matrix matched standards.

Keywords:
LASIL, mixed ionic electronic conductors, boride based hard materials

Created from the Publication Database of the Vienna University of Technology.