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(A) Using DNAzyme-functionalized AuNPs and graphene oxide for Pb2+ detection; (B) Hydrogel-sensing platform with DNAzyme-functionalized AuNPs; (C) Lateral-flow device using DNAzyme-functionalized AuNPs for Pb2+ detection. Structure of lateral-flow device—1: Wicking pad, 2: Conjugation pad, 3: Control zone, 4: Test zone, 5: Absorption pad.
