title: Synthesis of hollow ZnO microspheres by an integrated autoclave and pyrolysis process.
abstract: Hollow zinc oxide microspheres have been synthesized from a micro ZnBr2·2H2O precursor obtained by an autoclave process in bromoform steam at 220 °C /2.5 MPa. Field-emission scanning electron microscropy (FE-SEM) and transmission electron microscopy (TEM) show that the products are about 1.0 µm single crystal spherical particles with hollow interiors, partly open surfaces and walls self-assembled by ZnO nanoparticles. X-ray diffraction (XRD) analysis shows that the as-prepared ZnO hollow spheres are of a hexagonal phase structure. A possible formation mechanism is suggested on the basis of the shape evolution of ZnO nanostructures observed by SEM and TEM. The room-temperature photoluminescence (PL) spectrum shows UV emission around 386 nm and weak green emission peaks indicating that there are few defects in the single crystal grains of the ZnO microspheres.
authors.affiliation: Department of Physics, Central China Normal University, Wuhan 430079, People's Republic of China.
authors.forename: Jinxia
authors.initials: J
authors.lastname: Duan
authors.forename: Xintang
authors.initials: X
authors.lastname: Huang
authors.forename: Enke
authors.initials: E
authors.lastname: Wang
authors.forename: Hanhua
authors.initials: H
authors.lastname: Ai