Kontrollierte Festkörperreaktionen im Nanometerbereich unter besonderer Berücksichtigung des Kirkendall-Effekts
Zusammenfassung der Projektergebnisse
We have investigated temperature-driven solid state reactions (SSRs) and the Kirkendall effect in a number of system pairs (Al2O3/ZnO, Fe2O3/ZnO, CoxOY/ZnO, Fe2O3/CoxOY, Fe2O3/CoxOY/ZnO, Fe2O3/NixOy, CoxOy/NixOy, AbOs/NixOY, Fe2O3/MgO, CoxOy/MgO, Al2O3/MgO). In the Al2O3/ZnO material system we studied the effects of stress on void formation by the Kirkendall effect. Comparing planar with V-trench samples proved that mechanical stress plays a significant role for the morphology of the Kirkendall voids. We also applied the stress effect to core-shell nanowires and fabricated novel "pea pod" like nanowire structures. We identify two systems: Fe2O3/ZnO and Fe2O3/CoxOY/ZnO, in which we observe solid-state reactions in combination with the Kirkendall effect and pronounced ferromagnetism for the first time. Challenges with SSRs in other systems we investigated were due to phase separation in Co oxide or stoichiometry changes of Ni oxide at high temperatures. We propose a novel way to "steam out" micro- and nanostructures using an annealing step at 400 °C of the Al2O3/MgO system. We demonstrate the generality of this process by applying it to flat and nanopatterned surfaces.
Projektbezogene Publikationen (Auswahl)
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Study of temperature-dependent solid-state reactions with Kirkendall effect in thin oxide films using X-ray refiectivity. HASYLAB annual report (2009)
A. Zolotaryov, D. Novikov, S. Goetze, D. Hesse, and K. Nielsch
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Atomic Layer Deposition on Phase Shift Lithography generated photoresist patterns for the fabrication of 1-D nanochannels and applications to nanotemplating. ACS Applied Materials & Interfaces 2 (2010) 3397
F. Güder, Y. Yang, M. Krüger, G.B. Stevens, M. Zacharias
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Contriolled Positioning of Large Interfacial Nanocavities via Stress-Engineered Void Localization. Small 6, 1603 (2010)
F. Güder, Y. Yang, S. Goetze, A. Berger, N. Ramgir, D. Hesse, M. Zacharias
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Diffusion Induced Void Evolution in Core-Shell Nanowires: Elaborated View on the Nanoscale Kirkendall Effect. Isr. J. Chem.50 (2010)439
Y. Yang, F. Güder, M. Zacharias
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Temperature-dependent solid-state reactions with and without Kirkendall effect in Ai203/ZnO, Fe203/ZnO, and CoxOy/ZnO oxide thin film systems. Advanced Engineering Materials 12, 509 (2010)
A. Zolotaryov, S. Goetze, R. Zierold, D. Novikov, B. Birajdar, D. Hesse and K. Nielsch
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"Processing of hollow micro- and nanostructures using the hydrophilic nature of MgO". Precision Engineering 35, 496-499 (2011)
A. Zolotaryov, J. Bachmann, J.M. Montero-Moreno, K. Pitzschel, K. Nielsch
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"Structural and Magnetic phenomena in ultrathin C/Co/C Stacks prepared by DC magnetron sputtering". Phys. Status Solidi A, (2011)
A. Zolotaryov, Y. Bugaev, V. Samofalov, O. Devizenko, E. Zubarev, S. Martens, O. Albrecht, D. Görlitz, K. Nielsch
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Ferromagnetism and morphology of annealed Fe203/CoxOy/ZnO thin films. Advanced Engineering Materials 12, 330 (2011)
A. Zolotaryov, S. Goetze, J. Bachmann, D. Goerlitz, D. Hesse, and K. Nielsch
