Ethylene Glycol Assisted Hydrothermal Synthesis Of Flower Like Zno Architectures

摘要

We describe a simple route to flower like ZnO architectures, based on the decomposition of zinc acetate precursor in water-ethylene glycol solution at 140-160℃ for Id through hydrothermal method. The PXRD pattern reveals that the ZnO crystals are of hexagonal wurtzite structure. Ethylene glycol plays a key role on the morphology control of ZnO crystals. The SEM images of ZnO products prepared at 140℃ and 160℃ mainly exhibit flower like architecture composed of many rods. Whereas, the product prepared at 180℃ shows bunches accompanying a few number of free rods. TEM results reveal that the rods resemble swords with decrease in size from one end to another. From Raman spectrum, the peaks at 437 cm~(-1), 382 cm~(-1) and 411 cm~(-1) correspond to E_2 (high),A_1 (TO) and E_1 (TO) of ZnO crystals respectively. The photoluminescence spectrum exhibits strong UV emission at ～397 nm, which comes from recombination of exciton. The possible mechanism for the formation of flower like ZnO architecture is proposed.