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disruption to the sp2 structure could result in reducing the intensity of the Raman 2D band of graphene. In such cases, defect active Raman D band (2D band is overtone of D band) could be used to monitor the strain measurements.293 With regards to CVD graphene composite coatings, the shift rate (strain sensitivity) obtained in Chapter 7 for CVD graphene is ~ 35 % lower than MC graphene. This can be attributed to MC graphene being large single crystal domain. Recent improvements on CVD growth (as explained in section 2.3.5.1.1), have reported large single crystal domains growth in mm- to cm- sizes. It would be interesting to conduct the strain sensitivity study on large single crystal CVD grain-composite coatings. Furthermore, with the large area of CVD graphene films, effects of external cracks or notches in the film can be studied using automated Raman maps under strain, revealing the strain field. Chapter 8 – Conclusions and Future Works 240PDF Image | PRODUCTION AND APPLICATIONS OF GRAPHENE AND ITS COMPOSITES
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