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. 2015 Jun 23;15(6):14766–14787. doi: 10.3390/s150614766

Figure 1.

Figure 1

(a) The fluorescence spectra of NS-co-doped fluorescent carbon nanodots (NSCDs) as treated with different concentrations of methotrexate (MTX) ranging from 0–50.0 µM; the intensity decreases as the concentration of MTX increases and FRET is inhibited. The inset shows photographs that correspond to the increasing concentrations of MTX; (b) The linear relationship between fluorescence and MTX concentration. Reproduced with permission from Wang et al. [42]. Copyright 2015 Biosensors and Bioelectronics, Elsevier. PL, photoluminescence.