Two features in the graphite foil data fail to appear in the
curved kish or HOPG data: a small peak at 1335 cm-1 (D band) and a
shoulder at 1615 cm-1
(D’ band). D bands arise from graphene edges[7,8]. The foil and curved kish data sets are displaced vertically for
clarity. The curved kish graphite resembles highly oriented pyrolytic graphite
(HOPG), more than it resembles the disordered graphite (foil) which serves as
the carbon source for the curved kish.