Well-developed hexagonal ZnO nanorods and morphology-controlled nanostructures were synthesized at low temperatures using a simple solution method without the assistance of any templates or catalysts. Uniform conical nanorods with an average diameter of 35 nm and the aspect ratio of 14 could be obtained at a near-room temperature, while nanoplatelets with the planar aspect ratio of 2.4-4.8 were produced at higher temperatures. It was revealed that the morphology, dimensions, and the crystallinity of ZnO nanostructures could be controlled by elaborately adjusting experimental conditions such as the molar ratio of Zn2+ to OH-, EDA concentration, and temperature. (C) 2016 Elsevier B.V. All rights reserved.