Monoclinic CuO thin films on Cu foils were successfully synthesized by a simple wet chemical method in
alkaline solution with the pH of 13 at room temperature for different lengths of time. The as-synthesized
thin films were characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy,
scanning electron microscopy (SEM), transmission electron microscopy (TEM) and selected area electron
diffraction (SAED). Formation mechanism of the phase and morphologies was also discussed according to
the experimental results.Inthis research, assemblies ofpureCuO nanospindles withdifferent orientations
containing in the thin film synthesized for 2 weeks with 400 nm and 413 nm violet emissions showed
better antimicrobial activity against S. aureus than E. coli.