Phonon stiffen and soften at zigzag- and armchair-dominated edges of exfoliated bilayer graphene ribbon presented by Raman spectraMinggang Xia, Xiaohua Zhou, Duqiang Xin and Qiang XuEur. Phys. J. Appl. Phys., 80 3 (2017) 30302DOI: https://doi.org/10.1051/epjap/2017170271
