Table 2. Comparison of the Sensing Performance of Different Fluorescent Probes and C-CDs for Fe³⁺ Detection.

fluorescence probes	detection limit (μM)	linear range (μM)	refs
carbon dots	2.9	0–250	(64)
carbon dots	0.7	5–80	(65)
carbon dots	0.5	5–100	(66)
carbon dots	1.3	2–50	(67)
N-carbon dots	4.67	5–1280	(68)
P-carbon dots	0.005	0–20	(69)
N-carbon dots	0.025	0.1–500	(70)
carbon dots	0.239	0–80	(61)
C-CDs	0.006	10–80	this work