fig12

Figure 12. (A) Schematic illustration comparing the mammalian olfactory system with an electronic nose (e-nose)^[145]; (B) Schematic illustration of wearable e-nose with the ZigBee module and a photo of the fabricated e-nose sensor array; and (C) sensor array exposed to 200 ppm of volatiles, namely ammonia, acetic acid, acetone, and ethanol. This figure is quoted with permission from Lorwongtragool et al.^[125].