Table 3. Deconvoluted C 1s, O 1s, and Si 2p XPS Results of SiO2-NPs, MWCNTs, MWCNTs/SiO2-NPs (Si-NPs = 1.5 atom %) and MWCNTs/SiO2-NPs (Si-NPs = 5.75 atom %).
| x (eV) | Δω (eV) | int. (au) | x (eV) | Δω (eV) | int. (au) | x (eV) | Δω (eV) | int. (au) | x (eV) | Δω (eV) | int. (au) | x (eV) | Δω (eV) | int. (au) | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| C 1s and O 1s XPS | Peak-I (C=C/C–Si) | Peak-II (C=C) | Peak-III (C–O–Si/–COOH–Si) | Peak-I (C=O) | Peak-II (C–O) | ||||||||||
| MWCNTs | 283.5 | 0.7 | 48.7 | 284.3 | 2.3 | 25.0 | 288.8 | 6.5 | 26.3 | 530.5 | 2.7 | 60.6 | 531.9 | 2.2 | 39.4 |
| MWCNTs/SiO2-NPs (Si-NPs = 1.5 atom %) | 284.4 | 0.7 | 49.4 | 285.3 | 2.2 | 24.7 | 289.5 | 6.2 | 25.8 | 531.5 | 2.3 | 56.2 | 533.0 | 2.0 | 43.8 |
| MWCNTs/SiO2-NPs (Si-NPs = 5.75 atom %) | 281.8 | 0.9 | 87.8 | 282.4 | 2.4 | 12.2 | 529.2 | 1.2 | 67.6 | 529.8 | 2.1 | 32.4 | |||
| Si 2s and Si 2p XPS | Peak-I (Si–Si) | Peak-II (Si–Si) | Peak-III (Si–Si) | I = Si–C/Si–C–O/Si–O | II = Si–C/Si–C–O/Si–O | ||||||||||
| SiO2-NPs | 150.7 | 4.4 | 375 | 151.9 | 1.7 | 389 | 153.1 | 3.4 | 259 | 101.2 | 1.3 | 7241 | 100.8 | 1.2 | 7689 |
| MWCNTs/SiO2-NPs (Si-NPs = 1.5 atom %) | 151.6 | 2.3 | 270 | 154.1 | 2.2 | 588 | 156.3 | 4.9 | 142 | 100.4 | 3.1 | 28.0 | 103.0 | 2.4 | 72.0 |
| MWCNTs/SiO2-NPs (Si-NPs = 5.75 atom %) | 148.6 | 2.1 | 231 | 150.6 | 1.5 | 1224 | 151.6 | 2.9 | 851 | 99.4 | 1.2 | 60.0 | 100.2 | 2.1 | 40.0 |