Table 1.
Location of absorption bands exhibited by the functional groups in FTIR spectra obtained for individual GN and rGO samples.
| No. | Wavenumber [cm−1] |
Type of Bond | Sample | |||
|---|---|---|---|---|---|---|
| GN/ExF | rGO/Term | rGO/ATS | rGO/TUD | |||
| 1 | 3680 | O-H (stretch) | - | - | - | + (w) |
| 2 | 3600–3000 | O-H (stretch) | + (m) | + (w) | + (m) | + (s) |
| 3 | 3280 | N-H (stretch) | - | - | + (m) | + (m) |
| 4 | 3000–2800 | C-H (stretch) | - | + (m) | + (m) | + (s) |
| 5 | 1747 | C=O (stretch) | - | + (w) | - | - |
| 6 | 1711 | C=O (stretch) | - | - | + (m) | + (s) |
| 7 | 1640 | C=C (stretch) | + (m) | - | + (m) | + (s) |
| 8 | 1563 | COO- (stretch) | + (w) | - | + (m) | + (s) |
| 9 | 1465 | C-H (deformation) | - | + (w) | + (w) | + (m) |
| 10 | 1400 | -OH (in-plane bendig) | + (w) | + (w) | + (w) | + (s) |
| 11 | 1174 | C-O-C (stretch) | + (w) | - | + (m) | + (s) |
| 12 | 1124 | C-NH2/C-N (stretch) | - | - | + (m) | + (w) |
| 13 | 1100 | C=S (stretch) | - | - | + (w) | + (w) |
| 14 | 1018 | Carbon ring | - | + (w) | +(m) | +(m) |
| 15 | 800 | CH2=CH (deformation) | - | - | + (w) | + (m) |
| 16 | 659–511 | carbon ring | + (w) | + (m) | + (m) | + (m) |
| 17 | 617 | C-S (stretch)/S-O (scissors) | - | - | + (s) | + (m) |
Notes: designations used in the table: w—weak; m—medium; s—strong; “+”—current; “-”—absent. Abbreviations: GN, graphene; rGO, reduced graphene oxide; ExF, exfoliation; Term, thermal; ATS, ammonium thiosulphate; TUD, thiourea dioxide.