Precursor-Induced Hydrothermal Synthesis of Flowerlike Cupped-End Microrod Bundles of ZnO

Abstract
Flowerlike cupped-end ZnO microrod bundles have been hydrothermally synthesized from precursor ZnCl2(N2H4)2 in sheet shape at 140 °C for 12 h; under the same conditions using the same precursor in rod shape, uniform ZnO nanorods were obtained. XRD pattern indicated the sample is ZnO with hexagonal cell contants a = 3.251 Å and c = 5.206 Å. FE-SEM and TEM show the formation process of the ZnO sample. HRTEM revealed that the flowerlike cupped-end ZnO microrod bundles grow along the [101] axis. The UV emission peak at ∼396 nm and the blue band emission peak at ∼469 nm were observed by PL spectra. A possible formation mechanism was proposed.