Fig. 6
From: Raman evidence for pressure-induced formation of diamondene
High-pressure Raman experiments performed in different systems. a–c Single-layer graphene transferred to a Teflon substrate (G/T) using water as PTM. d–f Double-layer graphene transferred to Teflon substrate (G/G/T) using mineral oil (Nujol) as PTM. The same experimental procedures as performed for acquiring the data shown in Figs. 1 and 2 were repeated in both cases, and the same notations apply
