actually i am confused how inner levels do not split enough to overlap bands , due to which inter band transition occur and metal nanoparticles act as semiconductors.
Ioannis Samaras
What is the morphology of your artificial "metal" (bulk origin) nanomaterials[1] ?
1. https://en.wikipedia.org/wiki/Quantum_dot
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Daniil Bratashov
Metal nanoparticles I know work either due to plasmonic effects, or are very small, from several to tens of atoms so the single allowed band half-filled with valence electrons splits into levels that are enough separated to obtain interlevel distance somewhere in the typical semiconductor range (and allow photoinduced electron transitions with photons in vis-IR range).
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