Interface‐Adaptive Dual‐Color Hydrogel with Self‐Repairing Function and High Adhesion as Flexible Wearable Sensor for Minimally‐Invasive Monitoring Pesticide Residue in Living Crop

Harnessing dandy mechanical property, hydrogels facilitate the construction of wearable fluorescence sensors for minimally-invasive monitoring pesticide residue in living crops, while the interface self-adaptability and detection accuracy remain hugely challenging. Herein, blue-emission aggregation-induced emission nanoparticles (b-TPE NPs) and red-emission Mn-doped ZnS quantum dots (r-Mn@ZnS QDs) are encapsulated inside agarose, borax, and polyvinyl alcohol-co-constituted hydrogel to construct dual-color TPE@Mn@ZnS@AG@PVA as wearable crop sensor. Owing to specific recognition of r-Mn@ZnS QDs by thiophannate-methyl (TM), the customized TPE@Mn@ZnS@AG@PVA shows a gradual color evolution from reddish purple to blue with high resistance to environmental and experimental interferences via quenching r-Mn@ZnS QDs' fluorescence by target-induced aggregation and photo-induced electron transfer while acting negligible disturbance in blue fluorescence of b-TPE NPs, consequently achieving TM dual-color assay with limit of detection at 0.045 µg mL^-1. Additionally, TPE@Mn@ZnS@AG@PVA fascinates smart interface self-adaptability, high adhesion, and outstanding self-repairing function, and then is pasted onto the interfaces of crops to deliver on the sense pesticide residue data in minimally-invasive manner, leading to the monitor of dynamic TM degradation. This study offers an in-depth penetration into dual-color wearable sensor with distinctive features for minimally-invasive monitoring pesticide residue in living crops, advancing the development of wearable crop sensors and precision agriculture.