CO Gas-Induced Resonance Frequency Shift of ZnO-Functionalized Microcantilever in Humid Air

Figure 8

Possible model of CO gas adsorption in high humidity condition: (a) water vapors are present on the ZnO surface when CO is introduced; (b) CO gases produce the water vapor adsorption; (c) CO gases bind directly with zinc oxide layer.

(a)

(b)

(c)