XRDresults given in Fig. 1(b)confirm the progress of the reaction
from GRT to TRG. The sharp peak at 2 ∼27◦ indicates the (0 0 2)
plane of GRT. After oxidation of GRT, this peak is shifted to lower
2 values indicating that the interlayer spacing between GRT layers
has been increased by the oxygen functional groups. The reduction
of GO shows a small hump at 2 ∼20◦ and it clearly indicates that
the exfoliation of GO and as formed TRG contains a few layers of
graphene.