Optical properties of black carbon doped CuPC composites prepared by the slurry method

Abstract

Black carbon doped Copper phthalocyanine (CuPC) composites prepared with the slurry method were turned into pellets and their FTIR, XRD and UV properties were investigated. In XRD results, an increase in peak intensities was observed depending on the amount of BC doping. The optical properties of the composites, whose crystal and chemical structure were confirmed by XRD and FTIR analyzes, were analyzed by UV analysis. The forbidden energy gaps of CuPC and BC doped CuPC samples were calculated by converting the reflectance spectra to absorbance with the Kubelka Munk function. The increase and then decrease of Eg with BC doping is due to the structural relaxation that occurs when the molecular potential energy of the BC atoms entering the CuPC lattice first increases and then the BC atoms are fully placed in the CuPC structure. From the optical band absorption spectra, Eg values of 10% BC, 80% CuPC 20% BC and 70% CuPC 30% BC samples were found as 1.65 eV, 1.69 eV, 1.61 eV and 1.62 eV, respectively. It is evaluated that the organic composites can be used for optical applications.