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(a) Bamboo nanotubes fabricated by alternating voltage anodization. (b) branched nanotubes by voltage stepping. (c) double‐walled nanotubes. (d) amphiphilic double‐layer tubes.(a,b) Reproduced with permission.145 (c) Reproduced with permission.148 (d) Reproduced with permission.149 Copyright 2009, American Chemical Society.
