Fig. 11From: Carbon Dots as an Effective Fluorescent Sensing Platform for Metal Ion DetectionSynthesis of Gd-QCDs. The Gd(III) centers are immobilized in the carbonaceous matrix through coordination by residual O and N heteroatoms [97]. The inset shows the MRI positive contrast effects in T1-weighted images of the Gd-QCDs and the commercial Gd-based contrast agent-GadovistBack to article page