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Schematic illustration of the in situ chemical etching process for the synthesis of ZnO nanotips array.
FESEM images of (a) pyramid terminated nanorods array in the growth step and (b) nanotips array after in situ chemcical etching. (c) TEM image of the nanotips array and (d) HRTEM image of a ZnO nanotip, the inset is the corresponding selected area electron diffraction.
FESEM images of the nanotip morphology evolution upon etching with the time of (a) , (b) , (c) , and (d) in 0.5% ammonia solution.
FESEM images of (a) diameter ZnO nanorods array and (b) nanotips after chemical etching, (c) diameter ZnO nanorods array and [(d) and (e)] nanotips after chemical etching for 3.5 and , respectively.
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