Structural, optical, and magnetic characterization of Co and N co-doped ZnO nanopowders
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Co and N co-doped ZnO nanopowders with Co and N concentration 4, 6, and 8 mol% were synthesized by sol–gel method. Powder X-ray diffraction reveals that Co and N co-doped ZnO crystallize in wurtzite structure having space group C 6v . Photo-luminescence studies show the reduction in band gap with increase in concentration of dopants. Micro Raman studies show the red shift for 1LO phonon peak with increase in doping, generally credited to the stress caused by lattice mismatch due to N doping in ZnO. X-ray absorption spectroscopy reveals that Co replaces the Zn atoms and N replace the O atoms in the host ZnO lattice. Magnetic studies show that Co and N co-doped ZnO nanopowders exhibit ferromagnetic character at room temperature.
KeywordsCo3O4 Zinc Acetate Dihydrate Cobalt Acetate Tetrahydrate National Synchrotron Radiation Research Center Spherical Grating Monochromator
This research was supported by Academia Sinica and National Science Council, Taiwan, Republic of China, under the Grant number NSC98-2811-M-001-106. One of the authors, Sanjeev Kumar, is also thankful to IOP, Academia Sinica, Taipei for financial support.
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