title: Formation of quasi-single crystalline porous ZnO nanostructures with a single large cavity.
abstract: We report a method for synthesizing quasi-single crystalline porous ZnO nanostructures containing a single large cavity. The microwave-assisted route consists of a short (about 2 min) temperature ramping stage (from room temperature to 120 °C) and a stage in which the temperature is maintained at 120 °C for 2 h. The structures produced by this route were 200-480 nm in diameter. The morphological yields of this method were very high. The temperature- and time-dependent evolution of the synthesized powders and the effects of an additive, vitamin C, were studied. Spherical amorphous/polycrystalline structures (70-170 nm in diameter), which appeared transitorily, may play a key role in the formation of the single crystalline porous hollow ZnO nanostructures. Studies and characterization of the nanostructures suggested a possible mechanism for formation of the quasi-single crystalline porous ZnO nanostructures with an interior space.
authors.affiliation: Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), San 31, Hyoja-Dong, Nam-Gu, Pohang, Gyungbuk, Korea.
authors.forename: Seungho
authors.initials: S
authors.lastname: Cho
authors.forename: Semi
authors.initials: S
authors.lastname: Kim
authors.forename: Dae-Won
authors.initials: DW
authors.lastname: Jung
authors.forename: Kun-Hong
authors.initials: KH
authors.lastname: Lee
mesh_terms: D001205:Ascorbic Acid / Q000737:chemistry; D003460:Crystallization; D008872:Microwaves; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D016062:Porosity; D013696:Temperature; D015034:Zinc Oxide / Q000737:chemistry*
chemical_list: D001205:Ascorbic Acid; D015034:Zinc Oxide