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7.2. Applications of FLG/composites: Raman strain sensors....................................197 7.2.1. Types of FLG used ........................................................................................197 7.2.2. Raman spectroscopy characterisation of FLG and FLG/epoxy composite coatings 199 7.2.3. Raman deformational study of FLG/epoxy composite coatings..................203 7.3. Applications of CVD Graphene Composite Coatings: Wide-Area Raman Strain Sensors ...........................................................................................................................207 7.3.1. Composite coatings characterisation...........................................................208 7.3.1.1. 7.3.1.2. 7.3.1.3. Optical microscopy characterisation ....................................................208 Raman spectroscopy characterisation..................................................209 SEM characterisation ............................................................................210 7.3.2. Cyclic deformation behaviour ......................................................................212 7.3.2.1. 7.3.2.2. 7.3.2.3. 7.3.2.4. 7.3.2.5. graphene Sequence I: Uniform maximum strain ..................................................212 Sequence II: Increased maximum strain...............................................216 Sequence III: Mapping of strain over a wide-area of CVD graphene ...218 Sequence IV: Variable maximum strain ................................................220 Discussion: Comparison of micromechanics of exfoliated and CVD 223 7.3.2.5.1. G band shift in model CVD graphene coatings ...............................224 7.3.2.5.2. Doping levels in the CVD graphene coatings ..................................225 7.3.2.6. Cyclic deformation of commercial vs in-house CVD graphene ............226 7.3.3. Sensing ability of the coatings......................................................................228 7.3.3.1. 7.3.3.2. 7.3.3.3. Absolute accuracy – Example calculations ...........................................229 Absolute resolution – Example calculations .........................................230 Discussion: Strain sensing .....................................................................230 7.4. Summary ............................................................................................................232 8PDF Image | PRODUCTION AND APPLICATIONS OF GRAPHENE AND ITS COMPOSITES
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