Edges naturally exist in a single-layer graphene sample. Similarly, individual graphene layers in a multilayer graphene sample contribute their own edges. We study the Raman spectrum at the edge of a graphene layer laid on n layer graphene (nLG). We found that the D band observed from the edge of the top graphene layer exhibits an identical line shape to that of disordered (n+1)LG induced by ion-implantation. Based on the spectral features of the D and 2D bands, we identified two types of alignment configurations at the edges of mechanically-exfoliated bilayer and trilayer graphenes, whose edges are well-aligned from their optical images.
@article{arxiv.1412.8049,
title = {Raman spectroscopy at the edges of multilayer graphene},
author = {Q. -Q. Li and X. Zhang and W. -P. Han and Y. Lu and W. Shi and J. -B. Wu and P. -H. Tan},
journal= {arXiv preprint arXiv:1412.8049},
year = {2015}
}