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XPS non-metal surface composition of SS modification (%)
| C | O | N | Br | |
|---|---|---|---|---|
| untreated | 26.9 | 50.7 | 0 | 0 |
| polydopamine | 71.4 | 20.5 | 7.7 | 0 |
| initiator attachment | 69.8 | 20.6 | 4.5 | 2.2 |
| poly(OEGMA) | 65.5 | 32.4 | 0 | 0 |
| succinc acid modification | 67.4 | 31.6 | 0 | 0 |
| peptide tethering | 66.7 | 31.3 | 0 | 0 |
