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.

SampleTitanium%Oxygen%Carbon%Nitrogen%N/Ti × 100%

TiO2 N : Ti, 02463111.77.0
N-TiO2 N : Ti, 4 : 12462104.017
N-TiO2 N : Ti, 8 : 12259153.918