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Nanocrystals (NCs) of cesium lead halide perovskites are optically unstable, which prevents their use in optical sensors. The combination of perovskite NCs and metal single atoms (SAs) may be a good solution to this issue. Unfortunately, depositing metal SAs on perovskite NCs remains a challenge due to relative weak metal–halide bonds. Herein, we present that, via a photo assisted method using cesium lead halide perovskite NCs as host material to anchor Y single atoms, we successfully synthesize Y SA anchored CsPbBr3 NCs (Y-SA/CsPbBr3 NCs) with outstanding fluorescence stability through the formation of two Y–O bonds and two Y–Br bonds. In comparison to bare CsPbBr3 NCs, Y-SA/CsPbBr3 NCs possess more stable optical characteristics. The as-synthesized Y-SA/CsPbBr3 NCs can be employed as a colorimetric platform to perform rapid CH3I sensing. Detection limit of 0.044 ppm is exhibited in this approach with excellent anti-interference performance. The Y-SA/CsPbBr3 NCs-based system has been applied to the detection of CH3I in sweet potato samples with satisfying results.
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