Figure 14.

Sensing responses to a single pulse of 1000 ppb NO₂ of chemiresistors based on graphene (a) and ZnO decorated graphene (b). Sensing response of the graphene-based device (c) and of the device based on the ZnO functionalized graphene (d) in the range 0.1–1.2 ppm NO₂; the linear regression is reported as red line along with the regression coefficient. In the insets the selectivity towards 1 ppm NO₂, 50 ppm ethanol, 1% hydrogen (H₂), 50 ppm methanol and 250 ppm ammonia (NH₃) of both materials.