Figure 4From: Cellular distribution and cytotoxicity of graphene quantum dots with different functional groupsRepresentative fluorescence microscope images of cells. (a) Fluorescence image describing control cells. (b) Cells treated with 50 μg/mL of aGQDs for 12 h. (c) Cells exposed to 50 μg/mL of cGQDs for 12 h. (d) Cells after the treatment of 50 μg/mL of dGQDs for 12 h. Magnification, ×20.Back to article page