4.5. Cell Viability Assay

To study the cytotoxicity of the transition metal dichalcogenide MoS₂ QDs, different numbers of cancer and normal cells were treated with the MoS₂ QDs for different time intervals. At the end, we measured cell viability using the MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assay. For the MTT assay, we measured the absorbance at 540 nm using a Multiskan Ascent plate reader with Ascent software (Labsystems), as reported previously.^36,37