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(A) Surface passivation by attaching simple organic species to acid-treated carbon dots. (B) Representative STEM images of carbon dots surface-passivated with PEG1500N. (C) Photograph of the PEG1500N-attached carbon dots solution (a) excited at 400 nm under band-pass filters of different wavelengths as indicated and (b) excited at the indicated wavelengths directly. Reprinted with permission from ref (60). Copyright 2006 American Chemical Society.
