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Proposed assignment of Raman bands observed in the TERS spectra in Fig. 2b
| Raman band position (cm−1) | Tentative assignment |
|---|---|
| 1097 | C–O30,32 (νs, C–O) |
| 1179 | C–O–C30,32 (νs, C–O–C) |
| 1330 | C–CH330,32 (δs, C–CH3) |
| 1350 | D band (GO)29 |
| 1420 | C–H30,32 (βC–H) |
| 1590 | G band (GO)29 |
| 1654 | C=O30,32 (νs, C=O) |
| 1747 | COOH30,32 (νs, COOH) |
νs symmetric stretching mode, β bending mode, δs symmetric deformation mode
