Fig. 4

a The ESR spectra of DMPO/MoSe₂-PVP NPs to illustrate the ·OH scavenging ability of MoSe₂-PVP NPs. b The UV–vis absorption spectra of MoSe₂-PVP NPs incubated with salicylic acid and c corresponding photographs of b. d The ESR spectra of DMPO that incubated with MoSe₂-PVP NPs to illustrate the ·O²⁻ scavenging of MoSe₂-PVP NPs. e The scavenging ratio of DPPH· for MoSe₂-PVP NPs. The GPx-like activity of MoSe₂-PVP NPs at f 50 μg/mL and at g 200 μg/mL. h The UV–vis absorption spectra of DPPH· solution after incubated with MoSe₂-PVP NPs. i The scavenging ratio of MoSe₂-PVP NPs for DPPH