Fig. 3: Local chirality of racemates revealed by Au NPoMs.

a–c CDS spectra of Au NPoMs with racemate of OS DHs in the gaps. Schematic insets in a–c represent the occasions that the number of P-DHs is a more than, b less than, and c equal to that of M-DHs, respectively. d Statistical occurrence of the CDS intensity measured based on ~50 Au NPoMs/DHs. e Probability of enantiomer excess based on 10 DHs in the nanogaps of Au NPoM.