Table 1.
Raman and SERS signals assignment for D1 and GNR-PEG-D1. D-Arg: arginine; D-Tyr: tyrosine; D-Ser: serine; D-Gln: glutamine; D-Ala: alanine; D-His: histidine. ν: stretching. δ: bending. def.: deformation. The stretching mode (ν) is associated with the change in the continuum interatomic length of a couple of bonded atoms, while the bending mode (δ) is related with the change of an angle that is formed by two bonds.
| Raman D1 (cm−1) |
SERS GNR-PEG-D1 (cm–1) |
Assignment |
|---|---|---|
| 1677 | D-Gln Amide I (νC=O + δNH) |
|
| 1620 | 1621 | D-Gln |
| 1440 | 1430 | D-Arg |
| 1274 | 1298 | D-Tyr |
| 1212 | 1204 | D-Ser Amide III def. |
| 1051 | D-Arg | |
| 991 | D-Arg | |
| 929 | D-Arg/D-Gln | |
| 854 | D-Tyr/D-Ala | |
| 837 | 833 | D-Tyr |
| 725 | D-His | |
| 643 | 658 | D-Tyr |
| 598 | D-Ala | |
| 436 | δCN def. | |
| 407 | δCN def. |