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Chapter 7 – Application of Graphene composites: Raman Strain Sensors of graphene, is affected by several other factors such as the; processing methods, loading percentage, defects in the material and alignment of flakes within the composites. These factors influence the shift rate of the 2D band with strain (section 7.2.3). In the last few years, though, large area CVD films have become available and Sony Corporation has demonstrated roll-to-roll production and transfer of a 100 m long graphene films.159 Hence, composites coatings made from CVD graphene could be a potential candidate for Raman-based wide-area strain sensors. In this section, the performance of in-house prepared CVD graphene strains sensor coating is compared to the model mechanically cleaved graphene strain sensor. The performance of commercially available CVD graphene coatings were also studied for comparison. NOTE: In this section, data of MC graphene for uniform maximum strain deformation is being used from author’s previous work (Optical image and Raman 2D band response with loading strain).444 Those results support the discussions of the present work. 7.3.1. Composite coatings characterisation 7.3.1.1. Optical microscopy characterisation An optical microscope was used initially to identify the MC graphene flakes in the composite coatings by differentiating through contrast. Figure 7.8 shows the optical images of exfoliated graphene flakes on which cyclic deformations were carried out. The bright areas in Figure 7.8b are the bulk graphite. Figure 7.8c shows a large area of transferred PMMA/CVD film. The white streaks observed were due to the drying of the PMMA top coat. Wrinkles and damage were observed in the PMMA/CVD graphene thin film (Figure 7.8d) as a result of transfer process. 208PDF Image | PRODUCTION AND APPLICATIONS OF GRAPHENE AND ITS COMPOSITES
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