Abstract
A pulsed laser emitting UV radiations generated by the third harmonic of Nd:YAG was applied for the synthesis of nano-structured ZnO
2 and ZnO. For the synthesis of nanoparticles of ZnO
2, a high-purity metallic plate of Zn target was fixed at the bottom of a glass cell, in the presence of deionized water mixed with oxidizing agent H
2O
2, under repeated laser irradiation. The optical properties, size and the morphology of the synthesized ZnO
2 and ZnO by laser ablation was influenced strongly by post-annealing conditions which is not previously reported. By annealing ZnO
2 at 200
°C for 8
h, the product (ZnO
2) synthesized primarily was converted completely to ZnO. By variation of the annealing temperatures from 200 to 600
°C, the grain size of ZnO changes from 5 to 19
nm with a change in lattice parameters, the band gap and some other optical properties of nano-ZnO.