Fig. 2From: Carbon Dots as an Effective Fluorescent Sensing Platform for Metal Ion DetectionIllustration of the formation of a fluorescent CDs via laser ablation with PEG attached to the surface [32] and b GCDs prepared by exfoliation in an ionic liquid [36]. The inset is a transmission electron microscopy (TEM) image of the fabricated GCDs and the solution illuminated by an UV lampBack to article page