Zn1-xCoxO (x = 5%) nanopowders were prepared by using the autocombustion technique, and the structural, optical and magnetic properties were investigated. X-ray diffraction measurements show that the synthesized samples have a wurtzite structure. The formation of the wurtzite structure in Co doped ZnO nanoparticles was further confirmed by Fourier transform infra-red spectrometry. Optical absorption spectra show that the band energy of Zn0.95Co0.05O powders is about 2.42 eV at room temperature. Magnetic data obtained from as grown powders indicate the presence of antiferromagnetic interactions between particles.
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