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Abstract: Nanostructured SnO2 was prepared by the sol–gel method. Aniline monomer was polymerized in the suspension of nanocrystalline SnO2 to form inorganic–organic composite materials, in which SnO2 nanoparticles were embedded within netlike polyaniline (PANI). Structural and morphological characterizations of SnO2 and PANI/SnO2 were carried out using power X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM). Their electrochemical properties were also investigated using cyclic voltammetry, galvanostatic charge–discharge, and electrochemical impedance spectroscopy. The as-prepared composites had excellent properties in the capacitance, and its specific capacitance was up to 305.3Fg−1 with a specific energy density of 42.4Whkg−1 and a coulombic efficiency of 96%. The results indicated that the PANI/SnO2 had a synergistic effect of the complementary properties of both components. [Copyright &y& Elsevier]

Abstract: A novel nanostructured mesoporous Co x Ni1−x layered double hydroxides (Co x Ni1−x LDHs), which both Co(OH)2 and Ni(OH)2 exhibit, has been successfully synthesized by a chemical co-precipitation route using polyethylene glycol as the structure-directing reagent. Structural and morphological characterizations were performed using powder X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM). The component and thermal stability of the sample were measured by energy dispersed X-ray spectrometry (EDS), FT-IR and thermal analyses, including thermogravimetry (TG) and differential thermal analysis (DTA). Cyclic voltammogram and galvanostatic charge–discharge testified that the Co x Ni1−x LDH has a specific capacitance of 1809Fg−1 at a current density of 1Ag−1 and remains at about 90.2% of the initial value after 1000 cycles at a current density of 10Ag−1. The relationship between the chemical composition and the capacitance is discussed. [Copyright &y& Elsevier]

Abstract  Core-shell structured nanocomposites with NiFe2O4 as the magnetic core and polyaniline (PANI) as the conducting shell were prepared. The structural components in the NiFe2O4 and NiFe2O4/PANI were identified from Fourier transform infrared (FTIR) of the samples. The crystalline phase of NiFe2O4 and NiFe2O4/PANI was characterized by X-ray diffraction (XRD). The shape and size distribution of particles were observed by transmission electron microgragh (TEM). The thermal stability of samples was ensured by thermogravimetric analysis (TGA). The magnetic properties were measured by vibrating sample magnetometer (VSM). The results indicated that the resultant composites exhibited good quadrate morphology and uniform size with magnetic and conducting characteristic and high thermal stability. [ABSTRACT FROM AUTHOR]

Abstract: A method, whereby metal ions and precipitation reagents were transported in the nanochannels of anodic alumina membrane (AAM) templates by converse diffusion or convection and reacted in situ to form into one-dimensional nanostructure of the precursor, was developed. A high-aspect ratio nanowire array of the LaMnO3+δ was prepared by this method. Electron microscope images showed that the LaMnO3+δ nanowire array was abundant, uniformly distributed and well-ordered in large area. The individual nanowires are about 60nm in diameter and their length corresponds to the thickness of the applied AAM template. The analysis of X-ray diffractions demonstrated that the LaMnO3+δ nanowires are pseudocubic with typical perovskite lattice parameter. [Copyright &y& Elsevier]

Ordered CeO2 nanowire arrays embedded in anodic alumina membranes (AAM) were fabricated by a novel technique, in which anions and cations conversely migrated into the hexagonally ordered nanochannels of the AAM and reacted inside the channels to form one-dimensional nanostructures. The transmission electron microscopy (TEM) images show that CeO2 nanowires are about 60 nm in diameter, which correspond to the pore sizes of the membranes used. The selected-area electron diffraction (SAED) pattern indicates that the nanowires selected are single crystals. The scanning electron microscopy (SEM) images show that the resultant nanowires are abundant and uniform. The X-ray diffraction (XRD) spectra indicate that the CeO2 nanowires are cubic crystalline structure. The X-ray photoelectron spectroscopy (XPS) spectra data demonstrate that stoichiometric CeO2 is formed. [Copyright &y& Elsevier]