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Studies on Structural and Magnetic Properties of Co-doped Pyramidal ZnO Nanorods Synthesized by Solution Growth Technique

Publication Type : Journal Article

Thematic Areas : Nanosciences and Molecular Medicine

Publisher : Journal of Physics and Chemistry of Solids

Source : Journal of Physics and Chemistry of Solids, Volume 70, Number 3-4, p.659-664 (2009)

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Keywords : A. Nanostructures, Absorption bands, Amines, Amino complexes, Aqueous mediums, Aspect ratio, B. Chemical synthesis, C. Electron microscopy, Co ions, Co-doped, Co-doped ZnO, Cobalt compounds, Crystalline nanorods, D. Magnetic properties, Defect-related emissions, Doping (additives), Electron microscopes, Emission spectroscopy, Ferromagnetic behaviors, Hexagonal phase, Hexagonal structures, Large-area arrays, Magnetic properties, Molar ratios, Nanorods, Optical studies, Oxidation state, Preferred orientations, Pure ZnO, Room temperatures, Scanning electron microscopes, scanning electron microscopy, Semiconducting zinc compounds, Silica, Silica substrates, Sodium compounds, Solution growth techniques, Structural and magnetic properties, Substrate surfaces, Substrates, Synthesis (chemical), UV-vis spectrum, Vibrating-sample magnetometers, Wet chemicals, XRD studies, zinc, Zinc oxide, ZnO, Zno nanorods

Campus : Kochi

School : Center for Nanosciences

Center : Amrita Center for Nanosciences and Molecular Medicine Move, Nanosciences

Department : Nanosciences and Molecular Medicine

Year : 2009

Abstract : Large-area arrays of highly oriented Co-doped ZnO nanorods with pyramidal hexagonal structure are grown on silica substrates by wet chemical decomposition of zinc-amino complex in an aqueous medium. In case of undoped ZnO with an equi-molar ratio of Zn 2+/hexamethylenetetramine (HMT), highly crystalline nanorods were obtained, whereas for Co-doped ZnO, good quality nanorods were formed at a higher Zn 2+/HMT molar ratio of 4:1. Scanning electron microscope (SEM) studies show the growth of hexagonal-shaped nanorods in a direction nearly perpendicular to the substrate surface with a tip size of ∼50 nm and aspect ratio around 10. The XRD studies show the formation of hexagonal phase pure ZnO with c-axis preferred orientation. The doping of Co ions in ZnO nanorods was confirmed by observation of absorption bands at 658, 617 and 566 nm in the UV-vis spectra of the samples. The optical studies also suggest Co ions to be present both in +2 and +3 oxidation states. From the photoluminescence studies, a defect-related emission is observed in an undoped sample of ZnO at 567 nm. This emission is significantly quenched in Co-doped ZnO samples. Further, the Co-doped nanorods have been found to show ferromagnetic behavior at room temperature from vibrating sample magnetometer (VSM) studies.

Cite this Research Publication : M. Ka Patra, Manzoor, Kb, Manoth, Ma, Vadera, S. Ra, and Kumar, Na, “Studies on Structural and Magnetic Properties of Co-doped Pyramidal ZnO Nanorods Synthesized by Solution Growth Technique”, Journal of Physics and Chemistry of Solids, vol. 70, pp. 659-664, 2009.

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