Hydrothermal Growth and Optical Properties of Doughnut-Shaped ZnO Microparticles
journal contributionposted on 19.05.2005, 00:00 by Jianbo Liang, Jianwei Liu, Qin Xie, Sha Bai, Weichao Yu, Yitai Qian
Doughnut-shaped ZnO microparticles have been grown through a hydrothermal reaction in citrate solution at 120 °C. FESEM reveals that these microparticles consist of regular arranged nanoplates, and there is a concave on the surface of each microparticle. The existence of citrate is vital to the formation of the complex microparticles. Room temperature photoluminescence measurements show strong UV band emission. The yellow and green emissions related to the structure defects can be barely observed, indicating the high crystalline perfection of these microparticles.