Review Article
Electronic Nose Based on Nanomaterials: Issues, Challenges, and Prospects
Table 1
EN based on different nanomaterials and their detection principle and target molecules.
| Sr. number | Sensing material | Target | Principle | References |
| Single nanomaterial | 1 | SnO2 NB | Ethanol, isopropyl alcohol, toluene, | Chemiresistive | [83–86] |
| Multiple nanomaterial | 2 | Polypyrrole NTs |
Helional gas | Chemiresistive | [176] | 3 | Polypyrrole NTs | Amyl butyrate | FET | [177] | 4 | | | | | 5 | SnO2 NWs | Ethanol, CO and 2-propanol | Chemiresistive | [87] | 6 | SnO2 NWs | Ethanol, Water | Chemiresistive | [178] | 7 | SnO2, In2O3, and TiO2 NWs | H2, CO | Chemiresistive | [179] | 8 | CNT | Eugenol, 2–4 DNT, heptanal | FET | [180] | 9 | CNT | Amyl butyrate, pentyl valerate (PV), butyl butyrate (BB), and propyl butyrate (PB) | FET | [181] |
| Nanomaterials film | 10 | ZnO NPs | Chinese liquors | Chemiresistive | [182] | 11 | SnO2 NPs + Ag/Pt | H2 | Chemiresistive | [183] | 12 | Graphene | Amyl butyrate | FET | [109] | 13 | Au NPs | DNB, TNT, DNT | Chemiresistive | [184] | 14 | Diamond NPs | DNT, DMMP, NH3 | SAW resonators | [185] | 15 | Si-NWs | Cancerous cells | chemiresistive | [186] | 16 | Si- NWs | TNT | FET | [187] |
| Nanocomposites | 17 | CNT + SnO2 | Whiskey, methanol | Chemiresistive | [188] | 18 | PNC + CNT | Water, toluene | Chemiresistive | [189] | 19 | PNC | Lung cancer | Chemiresistive | [190] |
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