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Schematic Illustration of a) the synthesis and principle of UCNPs‐hCy7 for the detection of MeHg+. Reproduced with permission.163 Copyright 2013, American Chemical Society; b) the structure and sensing mechanism of the upconversion nanoprobe with silver nanoclusters for the detection of biothiols. Reproduced with permission;24 c) the process and principle of heterogeneous UCL detection of β‐HCG. Reproduced with permission.41
