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We have synthesized CdO nanocrystallites by the simple co-precipitate method. Influence of different transition metal ions (Cu, Mn, Cu-Mn) have been investigated on their structural morphology by XRD, FTIR, and SEM-EDS. XRD revealed that rocksalt CdO crystalline structure has been appeared in all samples after heat treatment (750°C for 3h). The chemical bonding and IR vibrations are confirmed by Fourier Transform Infrared (FTIR). SEM micrographs exhibited different morphologies corresponding to each dopant. Undoped sample has homogenous powder with grassy texture, Cu doped sample has flacks like structure, Mn doped has rod- like shape while Cu-Mn doped sample has almost spherical morphology. The analysis of elemental composition for each sample suggests the appropriate doping of transition metals (Cu, Mn & Cu-Mn). Various structural parameters like 'd' spacing; lattice parameters 'a', microstrain, and dislocation density is also calculated. This is further confirming the crystallographic modification appeared in CdO due to doping of Cu, Mn and Cu-Mn transition metal ions. The prepared doped metal oxides have numerous scientific and technological application awing to their unique properties specifically in Photovoltaic/Conductive devices. [ABSTRACT FROM AUTHOR]

Highly crystalline MgAl2O4nanopowder has been prepared by viable citrate sol-gel technique. We have annealed the sample at a thermal treatment i.e. 800°C and further compared the results with as-prepared sample. Crystallinity of the annealed sample isinvestigated by XRD, FTIR, and SEM-EDS. XRD analyzed the cubic spinel aluminates with lattice parameters 'a' = 0.8 nm with well defined reflection planes. Fourier Transform Infrared Spectroscopy depicted the chemical bonding and IR vibrations of the specific metal-oxygen bond. SEM micrographs further exhibited different shapes and texture of as-prepared and annealed nanopowder. The analysis of elemental composition for both samplesis evaluated by EDS spectra. The bandgap energy of as-prepared samples is (5.07 eV) found higher while that of annealed sample is low (1.8 eV). It is suggested that the annealed narrow band gap MgAl2O4 nanopowder is most crystalline and highly dense which is useful inphotocatalystsand advanced photonic devices. [ABSTRACT FROM AUTHOR]