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Chapter 7 – Application of Graphene composites: Raman Strain Sensors graphene is relaxed, the value of accuracy is constant at ~ ± 0.02 %, which is better than the commercially-available large-area strain sensors.328, 330 The maximum achievable resolutions of the exfoliated composites are in the range of ~15–18 μ𝜀 which is comparable to the commercially-available large-area strain sensors. These high resolution values correspond to a strong interface between the exfoliated graphene and the composite which leads to higher shift rates. As discussed earlier, the in-house CVD graphene has a lower resolution of ~27 μ𝜀, but still comparable to the exfoliated graphene, whereas, the commercial CVD graphene had poor resolution of ~72 μ𝜀. Nevertheless, the absolute accuracy values of the in-house CVD graphene after the relaxation of residual strains remained at ~ ± 0.01 % strain for sequences I, II and III. It should be noted that, the maximum strain that these sensors could withstand is defined by the strain to failure of the interface. Table 7-4: Calculated absolute accuracy and resolution of exfoliated and CVD graphene composite coatings Absolute Accuracy Composite Deformational (% strain) Absolute coatings sequence Resolution (μ𝜺) @ 0.1 @ 0.3 MC Sequence I (Same max. strain) ~ ± 0.04 ~ ± 0.02 ~ 15 Sequence II (Increase max. strain) ~ ± 0.03 ~ ± 0.02 ~ 18 Sequence IV (Variable max. strain) ~ ± 0.02 ~ ± 0.02 ~ 15 CVD (in-house) Sequence I (Same max. strain) ~ ± 0.01 ~ ± 0.01 ~ 27 Sequence II (Increase max. strain) ~ ± 0.01 ~ ± 0.01 ~ 27 Sequence III - ~ ± 0.01 ~ 27 CVD (commercial) Sequence II (Increase max. strain) ~ ± 0.03 ~ ± 0.03 ~ 72 231PDF Image | PRODUCTION AND APPLICATIONS OF GRAPHENE AND ITS COMPOSITES
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