Raman spectra of cells. (a) Mean Raman spectra of A549 cells before and after exposure to 200 μg/mL of GQDs. (b) Average Raman spectra of C6 cells before and after treated with GQDs at the concentration of 200 μg/mL. Excitation wavelength, 785 nm.
Yuan et al. Nanoscale Research Letters 2014 9:108 doi:10.1186/1556-276X-9-108