Extended Data Fig. 6: XPS C1s spectra of samples (1) and (7).

a,b, XPS C1s spectra of sample (1) (left) and sample (7) (right), measured at the center (a) and the edge (b) of each sample.
a,b, XPS C1s spectra of sample (1) (left) and sample (7) (right), measured at the center (a) and the edge (b) of each sample.