Table 5.
XPS determined elemental compositions for the different modifications steps of the hydroxyl (OH) and carboxyl (COOH) terminated monolayers. The TiO2 contributions have been subtracted from these values and the remaining concentrations renormalized to 100%.
| C | O | P | N | F | |
|---|---|---|---|---|---|
| OH | 69.8±3.0 | 27.0±2.6 | 3.2±0.5 | 0.4±0.1 | |
| Expected | 68.8 | 25.0 | 6.3 | ||
| +CDI | 70.8±1.6 | 26.5±1.5 | 2.7±0.3 | 3.3±0.9 | |
| Expected | 65.2 | 21.7 | 4.3 | 8.7 | |
| +F | 68.0±2.6 | 26.4±1.9 | 2.8±0.4 | 1.6±0.4 | 1.1±0.2 |
| Expected | 58.3 | 20.8 | 4.2 | 4.2 | 12.5 |
| COOH | 65.9±2.4 | 31.2±2.1 | 2.9±0.4 | 0.6±0.3 | |
| Expected | 66.7 | 27.8 | 5.6 | ||
| +NHS | 66.6±0.9 | 29.4±1.6 | 2.4±0.2 | 4.0±0.9 | |
| Expected | 64.0 | 28.0 | 4.0 | 4.0 | |
| +F | 61.6±1.1 | 29.2±0.7 | 2.0±0.3 | 3.6±0.4 | 3.7±1.3 |
| Expected | 60.9 | 17.4 | 4.3 | 4.3 | 13.0 |