Table 2.
XPS determined elemental compositions (at.%) of the (11-hydroxyundecyl)phosphonic acid and (12-carboxydodecyl)phosphonic acid bulk powders, and their monolayers on Ti90/Al6/V4. The TiO2 contributions have been subtracted from these values and the remaining concentrations renormalized to 100%.
| C 1s | O 1s | P 2p | N 1s | Cl 2p | C/P | |
|---|---|---|---|---|---|---|
| OH Powder | 75.7±0.5 | 19.6±0.6 | 3.7±0.1 | 0.9±0.1 | 20.5 | |
| OH monolayer | 69.8±3.0 | 27.0±2.6 | 3.2±0.5 | 0.4±0.1 | 21.8 | |
| Expected | 68.7 | 25.0 | 6.3 | 10.9 | ||
| COOH Powder | 74.0±1.5 | 22.5±1.3 | 2.9±0.0 | 0.6±0.1 | 25.5 | |
| COOH monolayer | 65.9±2.4 | 31.3±2.1 | 2.9±0.4 | 0.6±0.3 | 22.7 | |
| Expected | 66.7 | 27.8 | 5.6 | 11.9 | ||