Additional file 1. Wire characterization including representative TEM of unmodified SiNWs and SiNW-NH2, FTIR analysis of unmodified SiNWs and SiNW-NH2, and wide XPS spectrum for an amine-modified silicon nanowires. Confocal images of SiNW-NH2 after incubation with CHO-β cells at 2 and 5-hour incubation periods and a graph plotting the average number of wires internalized per cell as a function of incubation time at 37 °C. Confocal images of HeLa cells at 2 and 5-h incubation time at 37 and 4 °C with unmodified SiNWs
