UV Light-Modulated Fluctuation-Enhanced Gas Sensing by Layers of Graphene Flakes/TiO₂ Nanoparticles

Figure 2

Scanning electron microscopy images of porous layers comprised of graphene flakes/TiO₂ nanoparticles with ratios being (a) 5, (b) 10, and (c) 20 wt%.

(a)

(b)

(c)