Benefiting
from the stimuli-responsive property and powerful loading
capacity, functionalized hydrogels are favorable for the fabrication
of sensing devices. Herein, we design aggregation-induced emission
(AIE)-active hydrogel discs by embedding gold nanoclusters@zeolite-like
imidazole framework (AuNCs@ZIF) composites in double-network hydrogels
to build a sensitive pesticide biosensor. The hydrogel discs integrate
an AIE effect of AuNCs, a stimuli-responsive property of ZIF, and
a porous network structure of the hydrogel, which enhances the sensing
sensitivity via boosting the stable fluorescent signal and antifouling
performance. In conjunction with a homemade device, the fluorescence
images of hydrogel discs could be transduced into data information
for accurate quantification of chlorpyrifos pesticide with a detection
limit of 0.2 ng/mL. The dynamic degradation of chlorpyrifos in Chinese
cabbage is demonstrated to confirm the practical application of hydrogel
discs. Such AIE-active hydrogel discs could be a plant health sensor
for the on-site quantification of pesticide residues on crops, holding
great promise for precision agriculture.
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