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Spectral Properties of the Graphitic (G) and Defective (D) Carbon-Stretching Modes for Each Macromolecular Carbon Sample
| Sample | D band, cm−1 | G band, cm−1 | G FWHM, cm−1 | D/(D + G) intensity ratio |
|---|---|---|---|---|
| HOPG | n.d. | 1578 | 48.6 | — |
| Anthracite | n.d. | 1602 | 74.7 | — |
| Bituminous (hvC) | 1399 | 1615 | 81.5 | 0.29 |
| Sub-bituminous (B) | 1385 | 1615 | 85.7 | 0.28 |
| Lignite | 1384 | 1616 | 89.0 | 0.27 |
| Humic acid | 1401 | 1613 | 95.5 | 0.34 |
All Raman peak positions have an estimated uncertainty of ±5 cm−1.
FWHM = full-width half-maximum.
