Fig. 4
From: A modular synthetic approach for band-gap engineering of armchair graphene nanoribbons
Characterization of nanographenes and GNRs. a Raman spectra of G4–G6. b UV–vis spectra of G1–G3 in THF solution. c UV–vis-NIR spectra of G4–G6 in THF suspension. d AFM image of G5 on HOPG, scale bar: 70 nm. e A cross-sectional profile of the image (along the red line in d). f AFM image of G6 on HOPG, scale bar: 50 nm. g A cross-sectional profile of the image (along the red line in f). h Molecular model of G5. Green, carbon; blue, nitrogen; yellow, sulfur; gray, hydrogen. Eopt, gap: optical band-gap energy
