Because of the gap of each material represents a signature of this material, why is it not the case for a quantum dot made with the given material.
Dear Dr Zoubir,
Briefly, I think some phenomenons affect on energy gap of materials in nano-scale:
1-Quantum size effect 2- Quantum shape effect 3- Quantum surface effect.
When the dimensions of materials are reduced, the energy gap of them become more sensitive and Eg vary by dimensional changes.
Please see this file.
http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=4&cad=rja&ved=0CEIQFjAD&url=http%3A%2F%2Fwww.garlandscience.com%2Fres%2Fpdf%2F9780815344247_ch09.pdf&ei=gPYJU7DWG8WtrAey1YC4Dg&usg=AFQjCNHWfkMlyYYQqSjeV_wY1Hpmg_uymA&sig2=mj4pvzZlFZhdBwYN1pakhA&bvm=bv.61725948,d.bmk
Please have a look at my answer here
https://www.researchgate.net/post/Why_do_optical_band_gaps_increase_with_decreasing_size_of_nanomaterials
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