In the present work we introduce the growth of 3D-superlattice nanotubes by a simple anodization technique. Highly defined self-organized, oxide tubes with modulated tube wall composition can be created that allow altering and tuning optical, electrical and chemical properties of such nanometer-size architectures. The image shows a stacked nanotube array with built-in TiO2/ Ta2O5 heterojunctions.
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