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Fig. 2 | Nanoscale Research Letters

Fig. 2

From: Graphene-Assisted Thermal Interface Materials with a Satisfied Interface Contact Level Between the Matrix and Fillers

Fig. 2

Raman curves of the natural graphite and various graphene fillers. The Raman curves of these employed RGO and 3DGNs specimens are recorded, and some remarkable distinctions on the relative intensities of the D, G, and 2D peaks can be found. The corresponding curve of the natural graphite is also recorded for comparison. The high quality of the 3DGNs is proven by the absence of the D peak in the corresponding curve, which is similar with that of the natural graphite. Contrarily, a remarkable D peak appears in the profile of the GO sample because of the introduced defects during the oxidation process. Moreover, the absence of the 2D peak confirms this point of view. After a reduction process, the intensity of the D peak decreases significantly and the 2D peak reappears in the curves of the RGO specimens. Based on the integral intensity ratio of the ID/IG, the defect densities of these adopted graphene samples can be calculated (all the results and detailed calculation are listed in Additional file 1: Table S1) [15, 16]. After analyzing these curves, it is found that the positions of the G band of the natural graphite and 3DGNs locate at 1580 cm−1, which shift to 1600 cm−1 for the RGO, confirming the higher quality of the 3DGNs compared to that of the RGO [17, 18]

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