| Sample | TEOS (mL) | Water (mL) | EtOH (mL) | EuCl·6H2O 0.0597 M (mL) | HCl (μL) | AuNRs suspension (μL) |
|---|---|---|---|---|---|---|
| b0 | 0.60 | 0.45 | 1.95 | — | 150 | — |
| b1 | 0.60 | — | 1.95 | 0.45 | 150 | — |
| b2 | 0.60 | — | 1.95 | 0.45 | 150 | 100 |
| b3 | 0.60 | — | 1.95 | 0.45 | 150 | 200 |
| b4 | 0.60 | — | 1.95 | 0.45 | 150 | 400 |
| b5 | 0.60 | — | 1.95 | 0.45 | 150 | 800 |