Fluorescence Turns on-off-on Sensing of Ferric Ion and L-Ascorbic Acid by Carbon Quantum Dots

Table 2

Comparison of different carbon dots sensors for the determination of Fe⁺³.

Precursor	Method	Sample type	LOD (μM)	Linear range	Reference
Citric acid and urea	Solvothermal	Tap water	50	0.1–0.9 μM	[16]
Garlic	Solvothermal	Tap water	0.2	0–500 μM	[45]
Hydroxymethyl aminomethane and glycerinum	Solvothermal	Lake water	50	0.05–3.1 mM	[46]
Phenylalanine and citric acid	Hydrothermal	Tap water	0.72	5.0–500.0 μM	[47]
L - glutamic acid and ethylenediamine	Microwave	Tap water	3.8	8–80 μM	[48]
Hot pepper	Hydrothermal	—	1	10–90 μM	This study