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Transmission electron microscope images of Cu-containing mesoporous silica nanospheres (Cu-MSN) in bright field (BF) model (a) and high-angle annular dark field (HAAD) model (b). Energy-dispersive spectrometry element mapping images of all (c), Si (d), O (e), and Cu (f) elements distributed in Cu-MSN. Energy-dispersive spectroscopy analysis (g,h) of Cu-MSN.
