Full-LIG Wireless Batteryless Sensor for the Detection of Amines

Food waste management at the global level requires new technologies for an item-level monitoring of the volatile molecules emitted by food inside the package. The use of conventional chemical sensors requiring complex electronics is prevented at the large scale by not affordable costs. A possible solution can come from the Laser-Induced Graphene (LIG) technology that permits to impress a complex circuit onto a polymeric substrate by means of laser engraving. We here propose the first zero-power wireless sensors on polyimide for amine detection, useful for hazard evaluation in case of consumption, where both the interdigitated sensor and the communication antenna are entirely made by LIG with non-uniform lasing parameters. The device is flexible, is capable of detecting less than 15% concentration of triethylamine and is readable up to 1.5m by resorting to the backscattering modulation framework of Radiofrequency Identification in the UHF band.