title: Synthesis and characterization of mesoporous ceria with hierarchical nanoarchitecture controlled by amino acids.
abstract: In this work, we report the synthesis and characterization of mesoporous ceria with hierarchical nanoarchitectures controlled by amino acids. During the synthesis procedure, cerium oxalate precipitate was treated hydrothermally with different amino acids as crystallization modifiers, and hierarchically structured cerium oxalate precursors were obtained. Ceria can be produced after thermal decomposition of the cerium oxalate precursors. Structure and properties of the product were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy, N2 adsorption analysis, and X-ray photoelectron spectroscopy (XPS) methods. The results indicate that the mesoporous ceria with hierarchical nanoarchitectures are composed of nanosized ceria crystallites as building units and possess high surface area and high concentration of oxygen vacancy. Depending on different amino acids as the crystallization modifiers, the ceria exhibit different morphologies, such as dendritic aggregation of rods, dumbbells of nanorod arrays, or aggregated spheres. It is proposed that both the type of functional side groups and the length of the side groups of the amino acids influence the morphologies of the ceria. Meanwhile, the solvent and hydrothermal treatment temperatures also play important roles in the morphological control. The method reported in this work would be regarded as a general way to fabricate mesoporous metal oxides with hierarchical nanoarchitectures.
authors.affiliation: College of Chemistry, Department of Materials Chemistry, Key Laboratory of Functional Polymer Materials of MOE, Nankai University, Tianjin 300071, China.
authors.forename: Guijun
authors.initials: G
authors.lastname: Zhang
authors.forename: Zhurui
authors.initials: Z
authors.lastname: Shen
authors.forename: Mi
authors.initials: M
authors.lastname: Liu
authors.forename: Chenghua
authors.initials: C
authors.lastname: Guo
authors.forename: Pingchuan
authors.initials: P
authors.lastname: Sun
authors.forename: Zhongyong
authors.initials: Z
authors.lastname: Yuan
authors.forename: Baohui
authors.initials: B
authors.lastname: Li
authors.forename: Datong
authors.initials: D
authors.lastname: Ding
authors.forename: Tiehong
authors.initials: T
authors.lastname: Chen
mesh_terms: D000596:Amino Acids / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D036103:Nanotechnology
chemical_list: D000596:Amino Acids