I have a nanocomposite with three phases, i.e. Al2O3, TiO2, and Al2TiO5. I want to determine the band gap of this mixture. Is it true to report different band gap values for each phase or should I report a single value for this composite?
Hello Abolfazl Azarniya
The formation of three phases could be demonstrated by the XRD study and the DRS study will provide the reflactance study of the synthesized composite. Then form that DRS by using the Tauc plot the bandgap could be evaluated. To compare the bandgap of the synthesized composite with the compositions you can perform the different Tauc plot to draw a conclusion.
Regards
At least 2 of those phases, TiO2 and Al2O3, are common enough that it should be straight forward to find single phase versions of each and collect your UV-vis reflectance spectroscopy from each individual phase. You could then compare these results with your multi-phase system and see if the mixture has affected the band gaps. I think you would get away with reporting different band gap values for each if they matched closely enough with the single phase results.
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