Monocrystalline spinel nanotube fabrication based on the Kirkendall effect

Abstract

There is a deep interest in methods to fabricate hollow nanocrystals for potential application as high-efficiency catalysts or drug-delivery agents. Tubular one-dimensional nanocrystals have been prepared for a wide variety of materials, including semiconductors1,2, metals3,4, ferroelectrics5,6 and magnetite7. They can be produced by rolling up layered materials or via an axial growth in a rolled-up form8,9,10, coating pores in templates11 or by eliminating the core of a core-shell nanowire1,7. The Kirkendall effect, a classical phenomenon in metallurgy12, was recently applied to explain the formation of hollow spherical nanocrystals13,14,15,16,17. Although the experimental demonstration and theoretical treatment mainly concern binary compounds and planar interfaces or nanoscale spherical interfaces, the fabrication route provided by the Kirkendall effect should be generic, and should also work for high-aspect-ratio hollow cylinders (that is, nanotubes) or even more complex superstructures. In this letter, we report, for the first time, on ultra-long single-crystal ZnAl2O4 spinel nanotubes (total diameter: 40 nm, wall thickness: 10 nm) fabricated through a spinel-forming interfacial solid-state reaction of core-shell ZnO–Al2O3 nanowires involving the Kirkendall effect. Our results simultaneously represent an extension of applying the Kirkendall effect in fabricating hollow nano-objects from zero-dimensional to multidimensional, and from binary to ternary systems.

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Figure 1: Schematic diagram of the formation process of ZnAl2O4 spinel nanotubes.
Figure 2: Transformation of core-shell nanowires to nanotubes by means of the Kirkendall effect.
Figure 3: Microstructure and composition of the ZnAl2O4 spinel nanotubes.
Figure 4: Branched tubular spinel nanocrystals.

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Acknowledgements

M.K, U.G. and K.N acknowledge financial support from the German Federal Ministry of Education and Research (BMBF, FKZ 03N8701).

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Correspondence to Hong Jin fan.

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The authors declare no competing financial interests.

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Supplementary figures S1, S2 and S3 (PDF 1343 kb)

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Jin fan, H., Knez, M., Scholz, R. et al. Monocrystalline spinel nanotube fabrication based on the Kirkendall effect. Nature Mater 5, 627–631 (2006). https://doi.org/10.1038/nmat1673

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