Combustion synthesis of nanocrystalline co and al co-doped Zno (Zn _1-x-y CO _xAl _yo) and its powder characteristics

Co, Al co-doped zinc oxide [Zn _1-x-yCo _xAl _yO; x = 0.04, 0.03, 0.02; y = 0.01, 0.02, 0.03] nanoparticles were synthesized by a citrate assisted combustion method at 500°C for various doping levels using zinc, cobalt and aluminum nitrates as precursors. The synthesized oxide nanopowders of different compositions were calcined at 600, 700 and 800°C for 2 h. The synthesized Zn _{1- x-y}Co _xAl _yO nanocrystals were characterized for their thermal, structural, and morphological features. The structural studies resulting in doping-independent crystallite sizes and the thermal analysis confirm the execution of complete combustion. The average particle size of ZnO nanocrystals decreases due to the tension caused by Co and Al dopants in the zincite structure and the ionic size differences. The as-prepared nanoparticles with an average particle size in the range of 10-20 and 20-30 nm were observed for doped and undoped ZnO, respectively.