title: From layered double hydroxide to spinel nanostructures: facile synthesis and characterization of nanoplatelets and nanorods.
abstract: Mg-Al spinel (MgAl2O4) nanorods and nanoplatelets transformed from Mg-Al layered double hydroxide (Mg-Al-LDHs) were synthesized via a combined hydrothermal method and calcination route using Al(NO3).9H2O and Mg(NO3)2.6H2O as raw materials. The nanorods and nanoplatelets were characterized by means of physical techniques, including powder X-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution transmission electron microcopy (HRTEM), selected-area electron diffraction (SAED), Fourier transform infrared spectra (FT-IR), thermogravimetric (TG), and nitrogen adsorption-desorption isotherms. XRD patterns reveal that the Mg-Al-LDHs nanostructures were obtained under a hydrothermal reaction temperature of 200 degrees C and Mg-Al spinel nanostructures were fabricated via calcination of the Mg-Al-LDHs nanostructures at 750 degrees C. It can be seen from TEM that the sizes of the Mg-Al-LDHs nanoplatelets were about 20-40 nm and the diameters of the MgAl2O4 nanorods were ca. 6 nm. The HRTEM images indicate that the crystal lattice spaces of the MgAl2O4 nanorods and nanoplatelets are 0.282 and 0.287 nm, respectively.
authors.affiliation: The Institute for Chemical Physics and Department of Chemistry, Beijing Institute of Technology, Beijing 100081, P.R. China.
authors.forename: Genban
authors.initials: G
authors.lastname: Sun
authors.forename: Lingna
authors.initials: L
authors.lastname: Sun
authors.forename: He
authors.initials: H
authors.lastname: Wen
authors.forename: Zhiqian
authors.initials: Z
authors.lastname: Jia
authors.forename: Kunlin
authors.initials: K
authors.lastname: Huang
authors.forename: Changwen
authors.initials: C
authors.lastname: Hu
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry*; D006878:Hydroxides / Q000737:chemistry*; D008277:Magnesium Oxide / Q000737:chemistry*; D049329:Nanostructures; D013057:Spectrum Analysis / Q000379:methods; D014961:X-Ray Diffraction
chemical_list: D006878:Hydroxides; C111130:spinell; D008277:Magnesium Oxide; D000537:Aluminum Oxide