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Parameters used to calculate the shell thickness for Ag-shell Au-core nanoparticles using XPS signal strengths.
| Parameter | Description or unit | Value |
|---|---|---|
| A | Ag/Au atom ratio | 64 |
| B | Attenuation length ratio | 0.82 |
| T | Normalized flat surface thickness | 5.1 |
| Topo | Topofactor | 0.67 |
| L | Attenuation length (nm) | 1.6 |
| Shell thickness | nm | 5.5 |
| Particle diameter (assuming 8 nm core) | nm | 19 |
