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

Figure 4

(a) FL emission spectra of the CD-RhB probe with different concentrations of Fe³⁺ (from bottom to top, 0, 0.01, 0.15, 0.3, 0.6, 0.9, and 1.2 μM) in PB buffer solution (10 mM, pH 7.4). (b) The ratios of the probe versus the concentration of Fe³⁺ within the range of 0.01–1.2 μM. The error bars represent standard deviations based on three independent measurements.

(a)

(b)