Table 3. Atomic Percentages of C and N from XPS, Along with C:N Ratios.
| silica sample | C (at%) | N (at%) | C:N |
|---|---|---|---|
| saturated w/o hydrolyzation | 5.35 | 1.32 | 4.05 |
| 1 cycle | 7.63 | 1.94 | 3.93 |
| 3 cycles | 8.33 | 2.24 | 3.72 |
| 5 cycles | 9.13 | 2.51 | 3.54 |
| 10 cycles | 11.34 | 3.43 | 3.31 |
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