Fig. 4. (a) 13C NMR spectrum and (b) 1H NMR spectrum of the S-GQDs; (c) negative-ion ESI-FTICR-MS of the S-GQDs; (d) MS/MS spectrum of m/z = 601.00. Inset is the structure of the S-GQDs corresponding to m/z = 601.00.
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