title: Rationally fabricating hollow particles of complex oxides by a templateless hydrothermal route: the case of single-crystalline SrHfO3 hollow cuboidal nanoshells.
abstract: Based on the theory of sol-gel science, perovskite SrHfO(3) hollow cuboidal particles with tunable sizes were rationally synthesized by templateless hydrothermal reactions in KOH solutions. The concentrated KOH solution not only elevated the supersaturation of the reactants to promote the grain growth of SrHfO(3) but also controlled the aggregated particle sizes by compressing the electrical double layers of the primary particulates. The following Ostwald ripening process produced hollow particles with sizes ranging from submicrometer to hundred nanometre. The HRTEM image and SAED pattern revealed the single crystal nature of each hollow cuboidal nanoshell. The KOH concentration and reaction time related experiments confirmed that the formation of SrHfO(3) hollow cuboidal nanoshell was driven by the Ostwald ripening process and followed our assumption. The particles experienced solid, core-shell and hollow morphologies as the reaction proceeded. Also, the formation of SrHfO(3) hollow cuboidal nanoshells favored high reaction temperature which initiated and accelerated the ripening process. The as-prepared hollow cuboidal nanoshells displayed blue light emission under UV laser excitation at room temperature. After calcination, the photoluminescence intensity declined due to the improvement of crystallinity.
authors.affiliation: Institute of Nanostructured Materials & Tianjin Key Laboratory of Fiber Modification and Functional Fiber, School of Materials Science and Engineering, Tianjin Polytechnic University, Tianjin, 300160, China.
authors.forename: Tiannan
authors.initials: T
authors.lastname: Ye
authors.forename: Zhenghong
authors.initials: Z
authors.lastname: Dong
authors.forename: Yongnan
authors.initials: Y
authors.lastname: Zhao
authors.forename: Jianguo
authors.initials: J
authors.lastname: Yu
authors.forename: Fengqin
authors.initials: F
authors.lastname: Wang
authors.forename: Lingling
authors.initials: L
authors.lastname: Zhang
authors.forename: Yongcun
authors.initials: Y
authors.lastname: Zou
mesh_terms: D006195:Hafnium / Q000737:chemistry*; D006878:Hydroxides / Q000737:chemistry; D057145:Nanoshells / Q000737:chemistry* / Q000648:ultrastructure; D036103:Nanotechnology / Q000379:methods*; D010087:Oxides / Q000737:chemistry*; D010316:Particle Size; D017680:Potassium Compounds / Q000737:chemistry; D013324:Strontium / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D006878:Hydroxides; D010087:Oxides; D017680:Potassium Compounds; C029943:potassium hydroxide; D006195:Hafnium; D013324:Strontium