Pure ZnO and doped with Co (2%, 6%, 10%) nanopowders were elaborated by sol-gel method. As a starting material, acetate of zinc and cobalt, citric acid, ethylene-glycol and bi-distilled water were used to synthesize the powder. The prepared solutions were stirred at different temperature ( 100°C, 130°C, 140°C, 150°C) and calcinated at 400°C and 500°C for 4 hours.

The obtained powders were characterized by XRD in order to identify their structure and the grain size as a function of different elaboration parameters: temperature, duration of the gel in the solution, started material concentration and dopant concentration and by IR.

The obtained results show on one hand  that the grain size varies between  20 nm and  55 nm for pure ZnO and 46 nm for doped powders and on the other hand that the crystalline structure is wurtzite for both pure and doped powders.

Further results were obtained by IR analysis confirming the  previous ones and showing some new effects.     

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