Title of article :
Synthesis of ZnO flowers and their photoluminescence properties
Author/Authors :
Wu، نويسنده , , Changle and Qiao، نويسنده , , Xueliang and Luo، نويسنده , , Langli and Li، نويسنده , , Haijun، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2008
Abstract :
Flower-like ZnO nano/microstructures have been synthesized by thermal treatment of Zn(NH3)42+ precursor in aqueous solvent, using ammonia as the structure directing agent. A number of techniques, including X-ray diffraction (XRD), field emission scan electron microscopy (FESEM), transmission electron microscopy (TEM), thermal analysis, and photoluminescence (PL) were used to characterize the obtained ZnO structures. The photoluminescence (PL) measurements indicated that the as-synthesized ZnO structures showed UV (∼375 nm), blue (∼465 nm), and yellow (∼585 nm) emission bands when they were excited by a He–Gd laser using 320 nm as the excitation source. Furthermore, it has been interestingly found that the intensity of light emission at ∼585 nm remarkably decreased when the obtained ZnO nanocrystals were annealed at 600 °C for 3 h in air. The reason might be the possible oxygen vacancies and interstitials in the sample decreased at high temperature.
Keywords :
A. Oxides , C. X-ray diffraction , D. Crystal structure , D. Optical properties , B. Chemical synthesis
Journal title :
Materials Research Bulletin
Journal title :
Materials Research Bulletin