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[求助]
石墨烯-Fe3O4拉曼光谱分析
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| 氧化石墨的拉曼峰D峰和G峰强度为300左右，而氧化石墨和Fe3O4复合体系的拉曼D峰和G峰强度却降低至15左右，文献中这两个峰是有降低，但没这么明显，并且测出来峰杂峰较多不平滑，想知道这个测得正确吗，还是有别的原因？谢谢 |
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zhaorui75
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kuaiyecheng: 金币+5, ★★★很有帮助, 非常谢谢，分析的很好，就是没看到你的图，能再发给我一次吗？ 2013-09-28 21:04:54
感谢参与，应助指数 +1
kuaiyecheng: 金币+5, ★★★很有帮助, 非常谢谢，分析的很好，就是没看到你的图，能再发给我一次吗？ 2013-09-28 21:04:54
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我做的就是氧化石墨与四氧化三体的复合我，我的拉曼我给你截图看吧，已经投稿的小修回来了，Raman spectroscopy has been utilized as a powerful tool for the characterization of graphene, as it can identify the number of layers [25], the electronic structure [26], the edge structure, the type of doping [27], and any defects in the graphene [28]. Figure 5 compared the Raman spectra of Fe 3O4 , GO/Fe3O4 and graphene oxide. The 7 Raman spectrum of the graphene oxide (in blue) became broader than that of GO/Fe3O4 hybrid microsphere (in red). In the spectrum of graphene oxide, the peak at 1594 cm -1 (G band) corresponded to an E 2g mode of graphite and was related to the vibration of sp 2 -bonded carbon atoms in a 2D hexagonal lattice. The peak at 1334 cm -1 (D band, the breathing mode of κ-point phonons of A 1g symmetry) was associated with vibrations of carbon atoms with dangling bonds in plane terminations of disordered graphite. The G mode of graphene oxide suggested a higher level of disorder of the graphene layers and defects increased during the functionalization process. Besides, the ratio of the intensities (I D /I G ) for graphene oxide was 1.22, indicating formation of some sp 3 carbon by functionalization. The G band located at 1594 cm -1 of the graphene oxide shifted 7 cm -1 toward high frequency with respect to that of the GO/Fe 3O4 hybrid microsphere (1587 cm -1 ); meanwhile the D band exhibited 24 cm -1 blue-shift toward high frequency with respect to that of the graphene-Fe3O4 hybrid spheres (1310 cm -1 ). These blue-shifts might be explained by considering the charge doping by oxygen atoms or ions binding with the carbon dangling bonds during oxygen RIE process. It was reported that, aside from the G band blue-shift, a bandwidth narrowing was also observed in the case of charge doping [29, 30]. The ratio of the intensities (I D /I G ) for GO/Fe 3O4 hybrid microsphere was markedly increased to 1.32; this phenomenon could be attributed to the significant decreased of the size of the in-plane sp 2 domains. As for magnetic oxide, comparing with Raman data of pure Fe 3O4 (in green), we believed that the prepared graphene-Fe3O4 hybrid spheres consisted of Fe3O4 . |
2楼2013-09-27 15:31:23
3楼2013-09-28 21:07:40