Table 2:
Surface % at/at for Ti, O, C, and N determined by XPS. Samples are prepared from precursors with different N : Ti molar ratios, fired at 250°C, 3 h, and 500°C 1 min. Ramp: 10°C/min.
Sample
Titanium%
Oxygen%
Carbon%
Nitrogen%
N/Ti × 100%
TiO
2
N : Ti, 0
24
63
11
1.7
7.0
N-TiO
2
N : Ti, 4 : 1
24
62
10
4.0
17
N-TiO
2
N : Ti, 8 : 1
22
59
15
3.9
18