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(a) Fourier Transform Infrared Spectroscopy spectra of SFO, dopamine and P-SFO. (b) X-ray diffractometer pattern of SFO and P-SFO. (c) X-ray photoelectron spectroscopy survey spectra. (c1-c4) High-resolution spectra for Sn 3d, Fe 2p, O and N of SFO nanozyme. (c5-c6) The auger spectrum of Sn and Fe.
