Research Article
Fluorescence Turns on-off-on Sensing of Ferric Ion and L-Ascorbic Acid by Carbon Quantum Dots
Figure 6
(a) Fluorescence spectra of serial solutions of HP-CQDs: Fe3+, the fluorescence spectra were recorded when excited at 350 nm. (b) Calibration graph of HP-CQDs: Fe3+ solutions. (c) Fluorescence spectra of serial solutions of HP-CQDs: Fe3+-L-ascorbic acid, and the fluorescence spectra were recorded when excited at 350 nm. (d) Calibration graph of HP-CQDs: Fe3+-L-ascorbic acid solutions.
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