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(a) Photos of water solutions with dispersed O, N-CDs in daylight and under the UV-light illumination. (b) TEM image of O, N-CDs (insert SAED pattern). The O, N-CDs are shown with arrows. (c) AFM images showing the topographic view of the O, N-CDs. (d) Schematic structure of a single O, N-CD adapted from [27].
