Fig. 2: Characterization of the NH-GQDs derivatives.

a HR-TEM image of NH-GQDs. b AFM image of NH-GQDs. c XPS full survey of NH-GQDs and TAT-NGs (10:1). d UV-Vis of NH-GQDs and PL spectra of NH-GQDs and FAPEG-TNGs. e HR-TEM images of TAT-NGs (10:1). f HR-TEM images of FAPEG-TNGs (scale bar of HR-TEM images, 10 nm; AFM image, 500 nm).