Single-crystalline MgAl2O4 spinel nanotubes using a reactive and removable MgO nanowire template
Single-crystalline MgAl2O4 spinel nanotubes using a reactive and removable MgO nanowire template
Fan, H.; Knet, M.; Scholz, R.; Nielsch, K.; Pippel, E.; Hesse, D.; Gösele, U.; Zacharias, M.
Using MgO nanowires as a reactive template, we fabricated for the first time single-crystal MgAl2O4 spinel nanotubes through an interfacial solid-state reaction of MgOAl2O3 coreshell nanowires. Single-crystal MgO nanowires are coated with a conformal thin layer of amorphous Al2O3 via atomic layer deposition. Subsequent annealing at 700 °C activates the interfacial reaction between MgO and Al2O3, transforming the alumina shell into a spinel shell. Finally, after etching away the remaining MgO core in ammonia sulfuric solution, MgAl2O4 spinel nanotubes are obtained. As a transition from conventional planar spinel layers via thin-film interface reactions, our result might open a window for the fabrication of a wide variety of MgO-based spinel one-dimensional nanostructures.
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Nanotechnology 17(2006), 5157-5162
DOI: 10.1088/0957-4484/17/20/020
Cited 66 times in Scopus
Permalink: https://www.hzdr.de/publications/Publ-8883