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Porous ZnO nanowire (NW) arrays were synthesized by a one-pot ammonium hydroxide-assisted hydrothermal method. By controlling the volume proportion between the solution and the bottle, ZnO NW arrays as long as 20μm have been obtained in a short duration of 8h, indicating a high growth rate of 2.5μmh−1. Further prolonging the hydrothermal reaction time to 20h, ZnO NWs become porous, which is a key...