fig3

Figure 3. Design and fabrication strategies of hydrogel matrices in metal nanozyme–hydrogel systems. (A) Schematic illustration of the fabrication process of the CPA hydrogel. Reproduced with permission from Ref.^[68]. Copyright 2024, Elsevier; (B) The synthesis of the supramolecular hydrogel. Reproduced with permission from Ref.^[70]. Copyright 2025, Elsevier. CPA: Composite polymeric aquogel; PBA: phenylboronic acid; CS-PBA: carboxyphenylboronic acid modified chitosan; PVA: polyvinyl alcohol; BPQD@MOF: black phosphorus quantum dots@metal-organic framework; NCECS: nitrided chitosan.