which indicates the
interlayer spacing of the graphene oxide was about 0.80 nm.
This indicates that the GO retains a layered structure. The large
interlayer distance is attributed to the formation of hydroxyl,
epoxy and carboxyl groups which causes the intercalation of
water molecules and increases the distance between the layers.
However, this peak disappears in the XRD pattern of rGO
which can be attributed to the successful reduction of the GO.
The PU sponge has no characteristic diffraction peaks because
it is amorphous. The GPU sponge shows a characteristic
diffraction peak at 11.4° like GO, indicating that the PU sponge
has been coated with GO. The XRD diagrams of rGO and the
rGPU sponge are similar indicati