Table 3. Calculated Peak Shifts and FWHMs of C 1s Spectra and Work Function of Structures in Figure 5a–c.
| number of heptagons | 0 | 2 | 4 | |
| ratio of the number of carbon atoms (C1:C2:C3) | 66:20:0 | 36:24:14 | 26:28:28 | |
| percentage of C3/% | 0 | 19 | 34 | |
| whole C 1s spectrum (C1 + C2 + C3) | peak top/eV | 284.0 | 283.9 | 283.7 |
| FWHM/eV | 1.25 | 1.40 | 1.40 | |
| C1 (hexagon) | peak top/eV | 284.0 | 283.9 | 283.7 |
| FWHM/eV | 1.15 | 1.20 | 1.20 | |
| C2 (C–H) | peak top/eV | 283.7 | 283.7 | 283.4 |
| FWHM/eV | 1.15 | 1.20 | 1.20 | |
| C3 (heptagon) | peak top/eV | 284.3 | 283.9 | |
| FWHM/eV | 1.25 | 1.20 | ||
| work functiona/eV | 4.59 | 4.68 | 4.87 |
a
Work function: energy difference between HOMO level and vacuum level.