Table 1.
Element content of the as-prepared CQDs calculated based on XPS analysis (atom %).
| Samples | C | O |
|---|---|---|
| CQDs-N10-Y | 63.8 | 34.4 |
| CQDs-N20-G | 57.1 | 40.9 |
| CQDs-N30-B | 55.9 | 42.6 |
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