characterization of cobalt oxide (Co 3 O 4) thin layers doped with transition metal (TM= Ni,
Mn, Cu) in order to investigate their structural, optical and electrical properties. The materials
were synthesized by the sol–gel method and deposited by dip-coating process. The
synthesized samples were characterised by Ultraviolet-visible spectroscopy (UV–visible), X-
ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and Complex …