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In this work, the ZnO nanostructures were synthesized successfully using the hydrothermal method.The variation of density, alignment and length of ZnO nanorods arrays (NRAs) can be adjusted by annealing time and spin-coating rate.In addition, the different morphologies of ZnO nanostructures can be controlled by ascorbic acid leads to inhibit the growth of the [0001] plane of ZnO.