Structural and optical properties of nanoparticles of tetraphenyl Porphin cobalt (II) annealed thin films

X-ray diffraction, scanning electron microscope and infrared Spectrum have been used to investigate the structural characterization of CoTPP in powder, as deposited and annealed films. The annealing effect on the crystallite size of CoTPP films, the annealing can modify the morphology of thin films by controlling the aggregate densification of COTPP thin films. Some optical constants of CoTPP were studied for as deposited and films which expose to thermal annealing. The annealing effect on optical energy gap, dispersion parameters, imaginary and real parts of dielectric constant. The electronic transition type is an indirect allowed transition. The values of optical constant were compared with the other porphyrin derivatives.