Dear Researcher,
When the the direct band gap of material is mixed with the indirect band gap of material, there what kind of band gap is occurred in the binary nanocomposite?
Well, you end up with an inhomogeneous medium. You may end up describing the optical properties by some kind of effective medium theory (the Maxwell-Garnett theory e.g. being one option.) The inhomogeneity of the system along with the nanoscaledness of its constituents will have it, that the notion of band gap in the sense of the constituents in bulk form loose their sharp meaning.
Therefore: what is the aim of our question? What for do you require the magnitude or character (e.g. direct vs. indirect) of "the band gap"?
Respected Prof. Kai Fauth,
I prepared g-C3N4/ZnO binary nanocomposite. Previous reports revealed that the g-C3N4 is indirect band gap where as ZnO is direct band gap. In my case, I took the absorption spectra to calculate the optical band gap. There is no much variation in the value of direct and indirect band gap (Tauc plot ). But I need clarification about the band gap.
I would propose that you show here with graphs what you to with your data and to provide references which would support what you do - according to your knowledge. The reason is that I am surprised to read that you seem to be making evaluations for both a direct and an indirect gap from a single absorption dataset. I would doubt that this is possible.
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