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SEM top view of cantilever covered by ZnO nanotubes. These nanotubes are obtained by the dissolution during 1.75 h of ZnO nanorods in a solution containing (a) 0.75 wt% of CTAB and 0.75 wt% of NH3(aq) and (b) 0.5 wt% of CTAB and 0.5wt% of NH3(aq). Inset: zoom of the obtained nanotubes.
