Figure 1.

The similarities and differences between the EN, B‐EN, and human nose structures. a) The olfactory mechanism of humans. The initial events of olfactory perception occur in the olfactory epithelium (OE). Olfactory transduction begins with the activation of odor receptors located on the cilia of OSNs, which constitute the OE. Subsequently transmits the odor information to the olfactory bulb, which integrates the odor information and transmits it to the olfactory center, thus triggering the sense of smell. b) The mechanism of electronics nose. EN acquires VOC through an air pump and then transmits the VOC to the sensor platform, where the chemical material on the sensor recognizes the odor and then transmits the signal to a computer for processing. Reproduced with permission.^{[ 24 ]} Copyright 2022, Elsevier. c) The mechanism of bioelectronics nose. Same as EN, B‐EN also has to acquire VOC through air pump, but the sensor platform is composed of biological components that mimic human olfaction and bind specifically to the odor, generating a signal that is amplified and converted, and then the final result is visualized through a computer. Reproduced with permission.^{[ 25 ]} Copyright 2019, American Chemical Society