I could not find a sharp absorption peak in the UV-vis absorbance spectra of CuO nanoparticles dispersed in pure ethanol solvent. Hence, the calculation of bandgap energy by Tauc Plot could not be performed. Is there any feasible method to determine the bandgap energy of synthesized CuO nanoparticles?
I would suggest using solid-state UV-Vis spectrum with barium sulfate powder to determine the bandgap of CuO.
CuO looks like a familiar metal oxide material, its energy gap for its bulk state is 1.2eV which not far from infrared in this rang the absorption mostly not sharp particularly for nun crystalline material. That is first, and second if your CuO Nanoparticles are not in a unique size then the absorption will be at different ener gap values, at this case the absorption curve mostly will be lost.
for more information you can see the attached title article and related lin
Dear Kamal
You are using a wrong approach. If you want to find the optical band gap of powders you must use Diffuse Reflectance Spectroscopy (DLS). Then you must use kubelka-munk method to find the absorption coefficient. Then you must use Tauc method the estimate the optical band gap.
maybe the references mentioned in https://www.researchgate.net/post/What_is_the_best_experimental_method_for_calculating_of_the_band_gap_of_a_semiconductor_material_what_is_it_based_on
can be of your help.
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