1)  the phonon frequency shift is proportional to the sqrt(bond energy)over bond length;

2)  the effective atomic CN is correlated to the n;

3)  the n-reduction induced red shift of the D and 2D modes originates from the interaction between a specific atom and all of its z neighbors;

4)  the n-reduction induced blue shift of the G mode results from the dimer interaction.

Number-of-layer discriminated graphene phonon softening and stiffening

http://www3.ntu.edu.sg/home/ecqsun/RTF/APL-n-GNR-Raman.pdf

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