Figure 2
Optical images of (a) a graphene flake on the O2 plasma-treated SiO2/Si substrate, (b) the graphene flake covered with a normal TEM grid after the first drop of IPA, (c) after the second of IPA.
(d1) and (d3) show the TEM and Raman images of the same graphene flake on the TEM grid. (d2) shows the Raman image of the carbon film supporting the graphene flake.
