“…Magnetite nanoparticles (Fe 3 O 4 NPs) were among the first reported nanozymes to possess peroxidase-like (POD) activity alike horseradish peroxidase (HRP) . Since then, an array of nanostructures, including monometallic nanomaterials like Au NPs, Ag NPs, Pt NPs, and bimetallic nanoparticles such as Au@Ag nanorods, porous PtCu dendrites, Pt 74 Ag 26 , FePt–Au, metal oxides like MoS 2 , WS 2 , Co 3 O 4 , cerium oxide, as well as mixed metal oxides like Cr 2 O 2 –TiO 2 , ZnCo 2 O 4 , Fe 3 O 4 –Fe 0 /Fe 3 C, metal cluster nanomaterials like mercaptosuccinic acid (MSA)-stabilized Cu nanoclusters, and Fe–N/C single-atom nanozymes, along with metal–organic framework-based nanomaterials, , have found wide applications in colorimetric biosensors for detecting H 2 O 2 . However, these nanostructured materials exhibit certain drawbacks, such as complex synthesis processes and limited biocompatibility.…”