Why does blue shift occur in Raman bands of CNTs?

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Srikanth Ammu

Charge tansfer doping phenomenon (p doping) can explain a blue shift in the G band but then again a more detailed RBM study would help

Firas Abdulrazzak

as you know the relation between wave length and energy thus the blue or read shift will be decided by the nature of bonding groups with conjugated C=C in CNTs.