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Photoluminescence emission spectra of (a) CDs at different concentrations of (i) free Fe(II) and (ii) free Fe(III), (b) CDs/β-cd at different concentrations of (i) free Fe(II) and (ii) free Fe(III), (c) CDs/LMH at different concentrations of (i) free Fe(II) and (ii) free Fe(III), and (d) CDs/Suc at different concentrations of (i) free Fe(II) and (ii) free Fe(III).
