Cu2O metal oxide was synthesized using NaBH4 as a reducing agent in this study. The transformation of Cu composite with the pH adjustment was investigated, and the conditions for Cu2O synthesis were analyzed. As pH of the solution was changed, the synthesized Cu composite evolved into Cu/Cu2O and Cu/Cu2O/CuO composites. The Cu2O composite synthesized under conditions closest to pure Cu2O was heat-treated at 200℃. The remaining minor Cu metal was oxidized, resulting in pure Cu2O particles with enhanced crystallinity. The synthesized Cu2O exhibited various morphology with particle sizes of about 160~720 nm, and the shape and size of the Cu2O particles remained significantly unchanged after heat treatment. Surface analysis was conducted to compare the changes before and after heat treatment. No significant changes were observed, except for those attributed to water evaporation. The Cu2O synthesized via this simple chemical reduction method can be utilized in various application fields, including catalysts, optical devices, and sensors.
