XPS elemental analysis of GQDs with different reaction time.
| C% | N% | O% | S% | Total% | |
|---|---|---|---|---|---|
| GQDs-3 | 68.06 | 5.05 | 23.57 | 3.32 | 100 |
| GQDs-5 | 70.55 | 3.15 | 23.06 | 3.24 | 100 |
| GQDs-7 | 74.11 | 2.48 | 20.26 | 3.16 | 100 |
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