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| Sample | Metal precursor | Selenium precursor | Capping agent | Concentration | Temperature | Time |
|---|---|---|---|---|---|---|
| 1 | NbCl5 | Se | OLA | 0.125 M | 320 °C | 120 min |
| 2 | NbF5 | Se | OLA | 0.125 M | 320 °C | 120 min |
| 3 | NbCl5 | SeO2 | OLA | 0.125 M | 320 °C | 120 min |
| 4 | NbCl5 | SU | OLA | 0.125 M | 320 °C | 120 min |
| 5 | NbF5 | SeO2 | OLA | 0.125 M | 320 °C | 120 min |
| 6 | NbF5 | SU | OLA | 0.125 M | 320 °C | 120 min |
