title: Hydrothermal growth and optical properties of doughnut-shaped ZnO microparticles.
abstract: Doughnut-shaped ZnO microparticles have been grown through a hydrothermal reaction in citrate solution at 120 degrees 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.
authors.affiliation: Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemistry, University of Science & Technology of China, Hefei, Anhui, 230026, PR China.
authors.forename: Jianbo
authors.initials: J
authors.lastname: Liang
authors.forename: Jianwei
authors.initials: J
authors.lastname: Liu
authors.forename: Qin
authors.initials: Q
authors.lastname: Xie
authors.forename: Sha
authors.initials: S
authors.lastname: Bai
authors.forename: Weichao
authors.initials: W
authors.lastname: Yu
authors.forename: Yitai
authors.initials: Y
authors.lastname: Qian