Figure 3

(a–b) SEM and (c–d) TEM images of TiO₂ NFs; (e–f) SEM and (g–h) TEM images of rGO@TiO₂ NFs. (h) shows an HRTEM image of the yellow frame in (g). Lattice of the anatase TiO₂ (inset images); the graphene connection (red arrows) and thickness of the graphene wrapping (red lines) are well shown.