The TEM images of GO and (1:20) RGO–TiO2 nanocomposite
are showed in Fig. 5a and b, respectively. The morphology of GO,
consisting of thin stacked flakes and having a well-defined fewlayer
structure at the edge, can be clearly seen in Fig. 5a. Fig. 5b
reveals a homogeneous dispersion of TiO2 in the RGO matrix and
that are eager to accumulate along the wrinkles and edge of visible
graphene sheets. The TiO2 nanoparticles are not simply mixed up
or blended with RGO; rather, they have been entrapped possibly
inside the RGO sheets. The tapping mode AFM image (Fig. S5, ESI)
of GO shows
∼5 mm size sheets and the height profile of thickness
less than 6.992 nm indicates formation of few-layers GO.