| Spectrum Label | O% | Ti% | Nd% | Gd% | Total |
| P25 TiO2 | 46.56 | 53.44 | --- | --- | 100.00 |
| Undoped TNTs | 49.07 | 50.93 | --- | --- | 100.00 |
| Nd-TNTs | 40.97 | 55.66 | 3.37 | --- | 100.00 |
| Gd-TNTs | 53.55 | 43.53 | --- | 2.92 | 100.00 |
| Nd-Gd-TNTs | 41.72 | 45.38 | 9.42 | 3.48 | 100.00 |