PL spectra of CoO film on Co plate and CoO single crystal were studied at various temperatures. During CoO oxidation, Co3O4 is formed in the substrate as isolated islands. Last, the band gap of CoO was imparted using the UV-Vis-IR spectrophotometer. The mechanism of the formation of Co3O4 oxide inside of CoO phase has been studied. The correct formula of aluminium oxide is. The PL spectra of Co3O4 were investigated in both visible and infrared range. If the symbol for Cobalt, Co, were written as CO, what would be wrong with it. The band gap of Co3O4 was determined in broad spectral range using UV-Vis-IR spectrophotometer. Fourth, the photoluminescence spectra (PL) of Co3O4 were studied at various temperatures. The laser-induced heating effect was also studied for the CoO powder samples. The second-order phonon scattering in CoO Raman spectrum provides evidence for the LO phonons observed in the DRFTIR spectrum. Third, Raman spectra of CoO were studied at various temperatures from 10 K to 295 K (room temperature). X-ray diffraction (XRD) was also used to characterize cobalt oxides. DRFTIR technique was used to characterize the LO in CoO powders, as well as the evolution process from CoO to Co3O4. Second, the FTIR spectra of CoO were studied by the reflectance configuration of CoO single crystal and calculation results from the modelling and oscillator fitting were used to identify the LO modes in CoO. The transverse optical phonons (TO) and the longitudinal optical phonons (LO) were evaluated, and compared with the calculation results. I have carried out a systematic and comprehensive spectroscopic study to elucidate the phonon spectrum and electronic band structures Co3O4 and CoO.įirst, the FTIR spectra of Co3O4 were studied by investigating angle dependent transmittance and reflectance spectra of the Co3O4 film, and diffuse reflectance FTIR (DRFTIR) of Co3O4 powders with different sizes. Fourier-transform infrared spectroscopy (FTIR), Raman scattering and photoluminescence spectroscopy are the generally used techniques for the characterization of materials. Recently, people have synthesized cobalt oxide nanostructures with different morphologies. Cobalt Oxides, Co3O4 and CoO, have remarkable properties for the application of lithium ion battery, magnetic materials and the photocatalyst.
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