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Vibrational properties of graphene nanoribbons are examined with densityfunctional based tight-binding method and non-resonant bond polarizationtheory. We show that the recently discovered reconstructed zigzag edge can beidentified from the emergence of high-energy vibrational mode due to strongtriple bonds at the edges. This mode is visible also in the Raman spectrum.Total vibrational density of states of the reconstructed zigzag edge isobserved to resemble the vibrational density of states of armchair, rather thanzigzag, graphene nanoribbon. Edge-related vibrational states increase in energywhich corroborates increased ridigity of the reconstructed zigzag edge.

the european physical journal. d, atomic, molecular and optical physics/the european physical journal. d, atomic, molecular, optical and plasma physics

Comparison of Raman spectra and vibrational density of states between graphene nanoribbons with different edges