Unmodified cadmium telluride quantum dots induce reactive oxygen species formation leading to multiple organelle damage and cell death.

By J. Lovrić, Sung Ju Cho, F. Winnik, D. Maysinger. Chemistry and Biology, 2005

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NanoGenotoxicology: the DNA damaging potential of engineered nanomaterials. (2009, background): “Uncoated CdTe QD are associated with elevated ROS production that damages the plasma membrane, mitochondria and nucleus, and in these cells antioxidant enzymes including superoxide dismutase 1 (SOD-1) are up-regulated in an attempt at cellular protection [45,106].”
Zinc Oxide Nanoparticles for Selective Destruction of Tumor Cells and Potential for Drug Delivery Applications (2010, background): “Another feature of ZnO nanoparticles, as stated earlier, is their ability to induce ROS generation, which can lead to cell death when the antioxidative capacity of the cell is exceeded [12,41,82-84].”