NobleBlocks
    A simple neridronate-based surface coating strategy for upconversion nanoparticles: highly colloidally stable <sup>125</sup> I-radiolabeled NaYF <sub>4</sub> :Yb <sup>3+</sup> /Er <sup>3+</sup> @PEG nanoparticles for multimodal <i>in vivo</i> tissue imaging | NobleBlocks