Portable Hg2+ Nanosensor with ppt Level Sensitivity Using Nanozyme as the Recognition Unit, Enrichment Carrier, and Signal Amplifier

References

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391Portable Hg2+ Nanosensor with ppt Level Sensitivity Using Nanozyme as the Recognition Unit, Enrichment Carrier, and Signal Amplifierhttps://doi.org/10.1021/acsami.0c00210SulfideCuS hollow nanospheres (HNSs)

Materials

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b nanozyme
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391CuS HNSs.200nmTEM

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Applications

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391CuS HNSs.a portable and cost-effective Hg2+ nanosensor has been developed based on a desorption-free enrichmentdetection integration strategy. The core of the nanosensor is the employment of CuS HNSs, which play three roles including recognition unit for Hg2+ sensing, enrichment carrier for Hg2+ preconcentration, and mimetic peroxidase for signal amplification and readout. The customizable enrichmentdetection integration strategy gives the nanosensor a high selectivity, a wide detection range (50 ppt to 400 ppb), and a high sensitivity with a minimum detectable Hg2+ concentration of 50 ppt. In addition, the as-developed nanosensor is feasible for analysis of Hg2+ in real-world environmental and food samples with moderate accuracy (deviation <10%) and reproducibility (recovery ∼82%).Hg2+Color0.05ppb82