Ethylene glycol-assisted electrochemical synthesis of CaMoO4 crystallites with different morphology and their luminescent properties

CaMoO₄ crystallites with different morphology were successfully prepared by an electrochemical method with the assistance of ethylene glycol (EG) for the first time. The as-prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and photoluminescent spectra techniques (PL), respectively. The results showed that the crystallization of CaMoO₄ relies on both applied electric current intensity and EG content in the electrolytic solution. With the increase of EG content, CaMoO₄ crystallite sizes decreased, and their morphology gradually changed from a cake-like shape into micro-rods with a higher aspect ratio. Moreover, the higher the applied electric current intensity, the more obvious the above effect was. All samples exhibit a green emission centered at 512 nm with 280 nm excitation wavelength at room temperature, but show different PL intensity.