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The aim of this study was to investigate the effect of fuel/oxidizer ratio on the combustion synthesis of nano-crystalline Zn – CoO green pigment. The fuel and oxidizer used in this study were glycine and nitrate respectively. Products were characterized by means of X-ray diffraction, Fourier transformation infra red spectroscopy, scanning electron microscopy and diffuse reflectance spectroscopy. X-ray diffraction patterns (XRD) showed that the formation of pure hexagonal ZnO phase was insensitive to fuel/oxidizer ratio variations. Well-crystalline single-phase ZnO was observed for low and stoichiometric fuel/oxidizer ratios. Average crystallite size determined from the Scherrer formula varied from 18 to 75 nm. The morphology of the obtained samples changed from hexagonal pyramidal to irregular porous sponge-like particles. The colorimetric results showed a broad reflectance band around 530 nm (green region) for all samples. The observation of green appearance of different samples synthesized using different fuel/oxidizer ratios was related to fade of Co 3 O 4  X-ray diffraction patterns and entrance of Co into ZnO structure.

international journal of materials research

Synthesis of nano-crystalline Zn – CoO pigment by the chemical combustion method: Effect of fuel to oxidizer ratio on structure, microstructure and color properties