A Novel Ratiometric Probe Based on Nitrogen-Doped Carbon Dots and Rhodamine B Isothiocyanate for Detection of Fe³⁺ in Aqueous Solution

Figure 1

TEM image (a) and size distribution (b) of CDs. (c) UV-Vis absorption spectrum and FL intensity spectrum of CDs (inset shows the photographs of CDs under day light and ultraviolet light). (d) FL emission spectra (with progressively longer excitation wavelengths from 340 to 400 nm) of CDs.

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