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MM: Fachverband Metall- und Materialphysik

MM 65: Nanomaterials - II

MM 65.6: Vortrag

Donnerstag, 19. März 2020, 18:45–19:00, IFW D

The Special Role of Oxygen in the Growth of Oxide-based Compound Nanowires: Experiments and Simulation — •Jasmin-Clara Bürger, Sebastian Gutsch, and Margit Zacharias — Department of Microsystems Engineering - IMTEK, Laboratory for Nanotechnology, University of Freiburg, Georges-Köhler-Allee 103, 79110 Freiburg, Germany

The growth of oxide-based compound nanowires allows for a huge field of applications due to their unique properties. However, systematic studies on the growth of SnO2 nanowires and the influences of the individual growth parameters on the resulting structures are rare. Especially for the usage in applications, a controlled and reliable growth process and the understanding of its manipulation are becoming necessary for a purposive resulting morphology. Particularly, the VLS growth and allied methods supported by a carbothermal reduction in a horizontal tube furnace are possessing a high sensitivity to a large quantity of influencing parameters. Recently, we reported on the inhibition of the NW growth provoked by a high oxygen concentration and the timing of the oxygen inflow due to the formation of an oxidic shell.[1] Neither oxygen nor SnO2 are soluble in the Au catalyst particle. Nevertheless, we showed that the oxygen inflow is necessary to grow these NWs.[1] Therefore, a control of the Sn/O ratio at the sample sites becomes mandatory.[1] We support our experiments with numerical simulations.

[1] J.-C. Bürger et al., J. Phys. Chem. C 122 (2018) 24407-24414