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Fig. 4. SEM images for synthesized G-100 at 700 °C. Fig. 3. SEM images for synthesized G-250 at 700 °C.

Figure 4 SEM images for synthesized G-100 at 700 °C. Fig. 3. SEM images for synthesized G-250 at 700 °C.

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Fig. 1. The Skim of tube furnaces system used in the preparation Graphene by CVDs at 700 °C.
Fig. 1. The Skim of tube furnaces system used in the preparation Graphene by CVDs at 700 °C.
Fig. 2. Raman spectroscopy for (a) G-250, (b) G-100 ee ee ee ee ee ee ee ae FS ee eee The Graphene or graphite peak created from the first-order scattering process of the double vibration’s degenerate phonon of center Brillouin zone which is due to sp? bonded carbon, while, the disordered structure of the graphene edges sheets in graphene was represent by D band [14]. Mostly Measurement of I,/I,, ratio is a well-known method for characterization the nature structure and disorder [15] for tubular graphene or graphite. The high intensity for 2D for graphite and graphene make it suitable to identify the nature of planer graphene and graphite by measurement the ratios of I,,/I, [16]. However the identification parameters between tubular structure and planer structure of sp? carbon was the intensity ratios of 2D. The evaluation of the synthesized graphene structure G-250 and G-100 required Raman spectroscopy to probe structural and physical properties of graphitic materials, such disorder, defects, charges, and strain [17]. The Raman The phase diagrams of Fe necessary to predict
Fig. 2. Raman spectroscopy for (a) G-250, (b) G-100 ee ee ee ee ee ee ee ae FS ee eee The Graphene or graphite peak created from the first-order scattering process of the double vibration’s degenerate phonon of center Brillouin zone which is due to sp? bonded carbon, while, the disordered structure of the graphene edges sheets in graphene was represent by D band [14]. Mostly Measurement of I,/I,, ratio is a well-known method for characterization the nature structure and disorder [15] for tubular graphene or graphite. The high intensity for 2D for graphite and graphene make it suitable to identify the nature of planer graphene and graphite by measurement the ratios of I,,/I, [16]. However the identification parameters between tubular structure and planer structure of sp? carbon was the intensity ratios of 2D. The evaluation of the synthesized graphene structure G-250 and G-100 required Raman spectroscopy to probe structural and physical properties of graphitic materials, such disorder, defects, charges, and strain [17]. The Raman The phase diagrams of Fe necessary to predict
the mechanism at the temperature of reaction in CVDs. The overall outcome of graphene synthesis, depend on Fe relatively high carbon solubility and that explained by phase diagram. Fig. 6, shows the phase diagram [19] it is notable that the solubility of carbon can reach a maximum of Fe is estimated to have the carbon solubility of >25 %. The temperature of precipitation in this work, was 700 °C and the carbon solubility decreases to reach less than 1% causing spontaneous carbon
the mechanism at the temperature of reaction in CVDs. The overall outcome of graphene synthesis, depend on Fe relatively high carbon solubility and that explained by phase diagram. Fig. 6, shows the phase diagram [19] it is notable that the solubility of carbon can reach a maximum of Fe is estimated to have the carbon solubility of >25 %. The temperature of precipitation in this work, was 700 °C and the carbon solubility decreases to reach less than 1% causing spontaneous carbon
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Graphene by CVDGraphene synthesis
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