“…For example, in the field of food safety, the detection of odorants and flavor substances can significantly improve the quality control of raw materials, the supervision of processing process, and freshness degree [ 11 , 12 , 13 , 14 , 15 , 16 , 17 ]. In the field of safety and security, the detection of drugs and explosives can be achieved by the contact-free detection of characteristic odorants [ 18 , 19 , 20 , 21 ]. The assessment of air quality is very necessary to maintain and improve the quality of human settlements by detecting waste gas and harmful gases [ 22 , 23 , 24 , 25 , 26 , 27 ].…”