Table 3. Direct and Indirect Band Gap Values of TiO2 Nanoparticles Calcined at Different Temperatures.
| band gap
(eV) |
||
|---|---|---|
| sample no. | direct (αhν)2 | indirect (αhν)1/2 |
| HTi-1 | 3.05 | 2.99 |
| HTi-2 | 3.03 | 2.98 |
| HTi-3 | 3.02 | 2.96 |
| HTi-4 | 3.01 | 2.94 |
| HTi-5 | 2.98 | 2.91 |
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