Fig. 6From: Sulfur-doped carbon dots synthesis under microwave irradiation as turn-off fluorescent sensor for Cr(III)a UV–Vis absorption spectra of S-CDs with the presence of Cr(III) versus excitation and emission spectra of S-CDs. b UV–Vis absorption spectra for Cr(III), S-CDs, and S-CDs with Cr(III)Back to article page