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. Author manuscript; available in PMC: 2020 Jan 15.
Published in final edited form as: Angew Chem Int Ed Engl. 2019 Jun 24;58(29):9871–9875. doi: 10.1002/anie.201904722

Figure 1.

Figure 1.

Synthesis and characterization of AC-dots. A) Synthesis of AC-dots and surface modification with guanidinium and carboxyl groups. Note that the positive charge of the guanidinium cation is delocalized. B) TEM images of AC-dots. A picture of diluted AC-dots in solution is shown. C–F) Full-scan XPS profiles of AC-dots and highresolution spectra for C1s, N1s, and O1s with peak deconvolution. G) Optical spectrum and excitation wavelength-dependent fluorescence emission spectra of AC-dots in solution.