fig13
![Bioreceptor-inspired soft sensor arrays: recent progress towards advancing digital healthcare](https://image.oaes.cc/e95f1dd7-7b37-4029-add6-befb4d405b08/ss3023.fig.13.jpg)
Figure 13. (A) Schematic illustration of the working principle of the wearable e-nose system; (B) photograph of a wearable e-nose on the armpit of a subject, with an integrated chemical sensor array and wireless circuit; and (C) responses of the sensor array to 5-25 ppm of hexanoic acid, dodecane, and decanal. This figure is quoted with permission from Zheng et al.[126]. MCU: Micro-controller unit; PVDF: poly(vinylidene fluoride); VOCs: volatile organic compounds.