Figure 5

Raman mapping inside the wear track at rGO concentration (a) 0.2 and (b) 1.0 mg mL−1.
Sublevel both in figure (a) and (b) describes: (a) metal oxide (b) D band (c) G band and (d) superimposed mapping pattern of D and G band, the scale in image show intensity. Tribology condition: Load: 500 mN, Linear speed: 0.5 cm/s, Ball: steel (dia. 2 mm).