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166 Graphene – Synthesis, Characterization, Properties and Applications Fig. 5. (a) AFM image of a transferred CVD graphene film onto glass substrate. (b) Cross section measurement of the height of the CVD graphene. Typical thickness exhibited by the transferred films is found within the range 1-3 nm. (c) TEM image of CVD graphene films. Inset shows a selected area electron diffraction (SAED) pattern typical of graphene (hexagonal dotted lines are used to guide the eye). 2.3.3 Micro Raman characterization of CVD graphene Micro Raman analysis is a powerful tool to confirm the formation of graphene layers on the Ni surface and to obtain information about the quality and the number of layers deposited. Figure 6a shows Raman spectra taken at different locations on the synthesized films over Si/SiO2/Ni substrates by using an excitation wavelength of 532 nm, with a power density of 2.0 mW cm-2. Strong peaks near 1580 cm-1 and 2690 cm-1 were found. Analysis of the frequencies and lineshapes of these peaks allows their assignment as the G and G’ bands of graphene layers, respectively (Ferrari, Meyer et al. 2006). The peak located at 1345 cm-1 corresponds to the D band of graphitic carbon species, which is associated with the amount of defects in the crystalline structure of the graphene layers. The low cross section of the D band confirms that synthesized films are largely free of structural defects. Fig. 6. (a) Raman spectrum obtained on as-synthesized graphene films on Si/SiO2/Ni substrates. D, G and G’ Raman bands for graphene are labeled on each spectrum. (b) Raman spectrum obtained on a single layer graphene. (c) Raman spectrum of bilayer or few-layer graphene.PDF Image | GRAPHENE SYNTHESIS CHARACTERIZATION PROPERTIES
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