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FTIR spectra (a) and XPS spectra (b) of HS and HS-s-M, High-resolution O 1s (c) and Si 2p (d) XPS spectra of HS and HS-s-M, TEM images of HS (e) and HS-s-M (f) (the insets in (a) and (b) are a higher magnification image of FTIR and high-resolution S 2p XPS spectra, respectively).
