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Fig. 2 | Nanoscale Research Letters

Fig. 2

From: RGO and Three-Dimensional Graphene Networks Co-modified TIMs with High Performances

Fig. 2

Raman and FTIR curves of the various samples. Raman curves of the adopted RGO nanosheets and 3DGNs are shown in a. Three major signals, G, 2D, and D peaks, can be seen for the former, while the D peak is difficult to find in the corresponding pattern of the 3DGNs. As for the graphite-like materials, the D peak is aroused from defects. Therefore, the obtained Raman profile implies the high quality of the 3DGNs. The G band associates with the E2g phonon at Brillouin zone center. Moreover, the defect density and average size of the RGO nanosheets can be calculated by the integrated intensity ratio of I G/I D. After calculation, the average size is ~ 500 nm, which is in line with the result of the SEM image. The enlarged FTIR is a useful tool to observe the chemical bond between various materials according to the intensities and positions of the corresponding signals. The major adsorption peaks and the corresponding functional groups of the ER are marked in b, and the spectra of the RGO nanosheets and 3DGNs are also presented. The similar signals at ~ 1600 cm−1 and 3000–3700 cm−1 are induced from the skeletal vibration of the graphene basal plane and the O–H stretching vibration of adsorbed water. A remarkable difference between these two profiles is that an additional obvious peak at 1335 cm−1 arising from the O=C–OH can be seen only for the RGO nanosheets resulting from the surface functional groups. After combining with the ER, the O=C–OH signal disappears absolutely, manifesting that the carboxyl on the surface of the RGO nanosheets reacts with hydroxyl of the ER to form a close chemical contact, which contribute to the phonon fast transport at the interface between them

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