LAUSR

Abstract The electrochemical behavior of copper electrode in sodium tungstate (Na 2 WO 4 ) solution has been studied through cyclic voltammetry (CV). CV results informed that CuWO 4 was formed in kinds of electrochemical processes followed with chemical reaction. A cationic exchange membrane-assisted electrolysis method was developed to synthesize optical nanoparticle CuWO 4 for the first time. Anode chamber collected CuWO 4 was calcined at 500 °C based on the thermogravimetry test result. The X-ray diffraction (XRD) pattern of calcined CuWO 4 showed no impurities. Microstructure of CuWO 4 was characterized by transmission electron microscope (TEM) and high-resolution transmission electron microscope (HRTEM). The fourier transform infrared spectroscopy (FTIR) of the sample further confirmed the formation of pure CuWO 4 nanoparticle. Furthermore, the optical property of the nanomaterial was studied by ultraviolet visible diffuse reflectance spectrophotometer (UV–vis) and photoluminescence (PL).