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Confocal fluorescence images (Z-stack) of A549 cells with the internalization of Ru(bpy)32+-doped SiNWs. A549 cells were incubated with Ru(bpy)32+-doped SiNWs for 3 h in 37 °C incubator before taking the images. Images were collected at stacks of 2-D images, occupying the same x–y position. 0.37 μm intervals with 488 nm laser to create a stack in the Z-axis.
