Abstract
Room-temperature ferromagnetism was observed in Zn0.9Co0.1O nanorods with diameters and lengths of ∼100–200 nm and ∼200–1000 nm, respectively. Nanorods were synthesized by a simple sol–gel method using metal acetylacetonate powders of Zn and Co and poly(vinyl alcohol) gel. The XRD, FT-IR and SAED analyses indicated that the nanorods calcined at 873–1073 K have the pure ZnO wurtzite structure without any significant change in the structure affected by Co substitution. Optical absorption measurements showed absorption bands indicating the presence of Co2+ in substitution of Zn2+. The specific magnetization of the nanorods appeared to increase with a decrease in the lattice constant c of the wurtzite unit cell with the highest value being at 873 K calcination temperature. This magnetic behavior is similar to that of Zn0.9Co0.1O nanoparticles prepared by polymerizable precursor method. We suggest that this behavior might be related to hexagonal c-axis being favorable direction of magnetization in Co-doped ZnO and the 873 K (energy of 75 meV) being close to the exciton/donor binding energy of ZnO.
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Maensiri, S., Laokul, P., Klinkaewnarong, J. et al. Structure and magnetic properties of Zn0.9Co0.1O nanorods synthesized by a simple sol–gel method using metal acetylacetonate and poly(vinyl alcohol). Appl. Phys. A 94, 601–606 (2009). https://doi.org/10.1007/s00339-008-4890-7
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DOI: https://doi.org/10.1007/s00339-008-4890-7