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Fig. 4 | Nanoscale Research Letters

Fig. 4

From: Synthesis of Yellow-Fluorescent Carbon Nano-dots by Microplasma for Imaging and Photocatalytic Inactivation of Cancer Cells

Fig. 4

Intracellular ROS generation. A Fluorescence images of HeLa, (a) Bright field transmission image, (b) CQDs fluorescence image collected in the range of 400–450 nm, (c) ROS detection reagent fluorescence image captured in the range of 510–530 nm, and (d) the merged image; B The intracellular ROS production for various concentrations of CQDs with or without irradiation for 15 min; C a simplified energy level diagram shows potential fluorescence and cell death energy transfer pathways. (S0, ground state of the fluorophore molecule; S1, first singlet excited state; Sn (n > 1); T1, first triplet excited state; Ex, excitation by photon absorption; FL, fluorescence)

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