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One critical challenge of fabricating stretchable TENG is to make stretchable electrodes. To validate the functionality of the stretchable Cu-paper with the linear kirigami pattern, its resistance was recorded at different tensile strains. As seen from Figure 4c, the resistance of the Cu-paper only increased from 120.39 Ω to 128.03 Ω when the applied strain reached 200%, which is equivalent to a negligible change of 6.34%. This result proves that the linear kirigami pattern is capable of accommodating the applied strain with minimal sacrifice of the conductivity of the stretchable electrode. To characterize the mechanical property of the KTENG, the stresses required for stretching the device to certain strains was measured. It is clear that the KTENG has a two-stage strain-stress response and its tensile modulus of the KTENG experiences a dramatic change from 59.6 kPa to 668.4 kPa when the strain reaches 60%. This phenomenon can be explained by the difference between the structural deformation and material intrinsic deformation. In the first stage, the kirigami patterns render the device stretchable and thus the stress required for stretching is mainly attributed to deforming the interlocking kirigami structure; while in the second stage, the FEP film with the rectangular kirigami pattern has reached its limit of structural stretchability and the FEP material itself undergoes plastic deformation. This is further verified by the stretching limit of a 60% strain for the PET and Kapton KTENG, as shown in Figure 18a. These two materials are stiffer than FEP/PTFE and cannot withstand large tensile strains, which makes the devices consisted of them break once their structural stretching limit from the rectangular kirigami pattern is reached. 2.3.3 Application of KTENG As discussed earlier in the working principles of the KTENG under stretching, electrical energy is generated through the distance change between the two triboelectric 53PDF Image | HIGH PERFORMANCE TRIBOELECTRIC NANOGENERATOR AND ITS APPLICATIONS
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