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Band gap of the samples calculated by taking the maximum of the first derivative of reflectance (dR/dλ) vs. wavelength (λ) as the band gap of a sample. Sample TiO2 Eg is the smallest, which is not surprising, since it consists of rutile. Mixed phase samples’ Eg is higher. The Eg of Ce-TiO2 is the highest.
| Sample | 1st Derivative Maximum | |
|---|---|---|
| Wavelength (nm) | Eg (eV) | |
| TiO2 | 401 | 3.09 |
| Ce-TiO2 | 395 | 3.14 |
| La-TiO2 | 400 | 3.10 |
| Gd-TiO2 | 399 | 3.11 |
