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Chapter 7 β Application of Graphene composites: Raman Strain Sensors 7.3.2.6. Cyclic deformation of commercial vs in-house CVD graphene The performance of commercially produced CVD graphene was also used to explore its use as strain sensor. Raman spectroscopy was used to characterise the as- received commercial CVD graphene on Cu foil from Graphene supermarket Ltd.338 and in- house grown graphene (used in sections 7.3.2.1 to 7.3.2.3).336 The Raman spectra of both the samples are shown in Figure 7.19. Figure 7.19: a) Raman spectra of as-supplied commercial CVD graphene and in-house grown CVD graphene on Cu (after baseline correction). b) Raman spectra of composite coating using commercial CVD graphene. The as-supplied commercial graphene has an intense D band around 1320 cm-1 which corresponds to the intrinsic defects of graphene and the πΌπ·βπΌπΊ ~1 with πΌ2π·βπΌπΊ ~1.5. Whereas with the in-house grown graphene, the absence of D band indicates its high quality, along with πΌ2π·βπΌπΊ ratio > 3 confirming the graphene is predominantly monolayer. Model composite coatings prepared from commercial CVD graphene was subjected to sequence II cyclic deformation (increased maximum strain). The Raman spectrum of the composite sample is shown in in Figure 7.19b and the D band is clearly visible after transfer. 226PDF Image | PRODUCTION AND APPLICATIONS OF GRAPHENE AND ITS COMPOSITES
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