Table 1. Elemental compositions (±0.5%) determined by XPS for (a) C60 and (b) (C59N)2 powders.
| Sample | C | N | O | O (532.2 eV) | O (533.8 eV) |
|---|---|---|---|---|---|
| C60 | 97.0% | — | 3.0% | 1.8% | 1.2% |
| (C59N)2 | 94.5% | 1.5% | 4.0% | 3.5% | 0.5% |
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