Relative atomic concentration of different bindings derived from the C 1s XPS spectra of the coatings.
| Coating | sp2 (%) | sp3 (%) | sp3/sp2 | C–O (%) | C O (%) | C–W (%) |
|---|---|---|---|---|---|---|
| DLC | 53.4 | 36.6 | 0.69 | 7.6 | 2.4 | — |
| 10WDLC | 51.1 | 18.9 | 0.37 | 9.8 | 2.2 | 18.0 |
| 10AgDLC | 54.2 | 32.1 | 0.60 | 10.4 | 3.3 | — |