Figure 11.

(a) The scheme of a fluorescence DNA biosensor to detect Hg²⁺ based on splitting Mg²⁺-dependent DNAzyme. Reprinted with permission from [86]. Copyright 2012 Royal Society of Chemistry. (b) The scheme of a visual and sensitive DNA biosensor for Hg²⁺ detection based on split DNAzyme amplification and peroxidase-like activity of hemin-graphene composites (H-GNs). Reprinted with permission from [92]. Copyright 2019 Elsevier. (c) The scheme of a simple and amplified Hg²⁺ detection strategy based on DNAzyme motor. Reprinted with permission from [93]. Copyright 2018 Elsevier. (d) The scheme of an electrochemical impedance biosensor for Hg²⁺ detection based on DNAzyme-assisted target recycling and hybridization chain reaction (HCR). Reprinted with permission from [94]. Copyright 2017 Elsevier.