Figure 5From: Ammonia gas sensors based on chemically reduced graphene oxide sheets self-assembled on Au electrodesSEM images of Py-rGO bridged between Au electrodes self-assembled with different concentration of GO. (a) and (d) 1 mg/mL, (b) and (e) 0.5 mg/mL, and (c) and (f) 0.25 mg/mL.Back to article page