Figure 3.

(A) The color reaction principle of TMB based on Au NP nano-enzymes and H₂O₂. (B) Schematic illustration of the multicolor sensor array. Reproduced with permission from [47]. Copyright 2020, Elsevier. (C) Schematic of the nano-enzyme sensor array based on Au PIAF for detecting multiple substances. (a): Schematic diagram of Au PIAF-catalysed TMB. (b): Schematic diagram of the binding of Au PIAF and different targets. (c): Schematic diagram of the detection of the targets using the absorbance at different absorption wavelengths as the sensor element. Reproduced with permission from [48]. Copyright 2021, Royal Society of Chemistry. (D) Schematic illustration of dopamine-mediated growth of Au NSPs enhancing their dual-enzyme mimetic activity. Reproduced with permission from [49]. Copyright 2023, Elsevier.