Development and Characterizations of Manganese Doped Cobalt Thin Film using Spray Pyrolysis Method

Abstract

In this paper, we report the growth of manganese-doped cobalt ferrite (CoMnF) thin films on FTO (fluorine-doped tin oxide) substrates using the spray pyrolysis technique. Key growth parameters were optimized, and the films were annealed at 450°C for 2 hours. Structural characterization via X-ray diffraction (XRD) confirmed the formation of a single-phase cubic spinel structure, with no additional peaks detected beyond the cubic phase. The films show interplanar distances ranging from 4.896 to 1.484 Å, small crystallite sizes (FWHM values between 0.338° and 0.497°), and a lattice constant of 8.418 Å. FTIR spectra reveal a key peak at 431 cm⁻¹, indicative of octahedral metal-oxygen stretching, confirming the ferrite phase. UV-Vis spectra show strong absorbance at 215 nm and 347 nm, with a direct bandgap of 5.6 eV, while Raman spectra highlight vibrational modes influenced by Mn doping. These properties make the Mn-doped Co-ferrite thin films promising for applications in supercapacitors, sensors, and energy storage devices.