Journal
ACS NANO
Volume 4, Issue 2, Pages 753-758Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn901250w
Keywords
atomic layer deposition; nested multiple-walled coaxial nanotubes; coaxial sacrificial spacer layer; porous alumina templates; chemical nanotube release
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Nested multiple-walled coaxial nanotube structures of transition metal oxides, semiconductors, and metals were successfully synthesized by atomic layer deposition (ALD) techniques utilizing nanoporous anodic aluminum oxide (AAO) as templates. In order to fabricate free-standing tube-in-tube namostructures, successive ALD nanotubes were grown on the interior template walls of the AAO nanochannels. The coaxial nanotubes were alternated by sacrificial spacers of ALD Al2O3, to be chemically removed to release the nanotubes from the AAO template. In this study, we synthesized a novel nanostructure with up to five nested coaxial nanotubes within AAO templates. This synthesis can be extended to fabricate n-times tube-in-tube nanostructures of different materials with applications in multisensors, broadband detectors, nanocapacitors, and photovoltaic cells.
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