The infrared spectroscopy showed that the O–H stretching peaks become narrow with an increase in the pH value. The average crystallite size of samples prepared at pH 8 to 10 was varying from 23.36 to 25.78 nm. X-ray powder diffraction (XRD) results disclosed that the growth of pure CuO with monoclinic structure at higher pH 8, whereas mixed phase was formed at lower pH 7. Scanning electron microscope (SEM) results shows that a higher pH results well-defined CuO nanoflakes. The phase purity, morphology, optical behavior, and elemental analysis of synthesized nanoparticles are shown to be critically dependent on the pH of the samples. This paper reports the pH-dependent growth of copper oxide (CuO) nanoparticles by wet chemical precipitation method using pH value of the samples as the only variable parameter.
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