Fig. 6: Formation mechanism of POP-C.

a–c Simulated time-lapse snapshots of PANI carbonization: a initial, b intermediate and c final configurations. Scale bar indicates 0.5 nm and is applicable to (a)–(c). d Temporal evolution of 5-membered ring (green), 6-membered ring (orange) and 7-membered ring (blue) as a function of simulation time. e, f Atomic structure of the simulated amorphous carbon layer, visualized from (e) side- and (f) top-view perspectives. Source data are provided as a Source Data file.