Fig. 4

a Dependence of the catalytic activity of Fe₃O₄-based BMNZs on their structure. Reprinted from Ref. [104] with permission from Wiley–VCH. Copyright 2011. b Photographs and schematic of the activity and specificity of molecularly imprinted polymers grown on Fe₃O₄ NPs. Reprinted from Ref. [29] with permission from the American Chemical Society. Copyright 2017. c TEM image of Cu_xO nanocluster BMNZs with multifunctional SOD-, CAT-, and POD-like activities. Reprinted from Ref. [63] with permission from the American Chemical Society. Copyright 2019. d Synthesis and enzyme-like activities of Cu/C BMNZs with antibacterial activities. Reprinted from Ref. [105] with permission from the American Chemical Society. Copyright 2019