Fig. 2: SFG spectra in the region corresponding to C–H stretching vibrations.

a Achiral SFG spectra of the D-GAn monolayer at a surface pressure of 40 mN/m at the air/water interface. The fitting results of (a) are listed in Supplementary Table 7. b Chiral SFG spectra of the L-GAn and D-GAn monolayers at different surface pressures at the interface. The fitting results are listed in Supplementary Table 8. The chirality was transferred to the alkyl chains, and the L-GAn and D-GAn assemblies showed a mirror-symmetrical chiral characteristic peak.