HIGH PERFORMANCE TRIBOELECTRIC NANOGENERATOR AND ITS APPLICATIONS

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HIGH PERFORMANCE TRIBOELECTRIC NANOGENERATOR AND ITS APPLICATIONS ( high-performance-triboelectric-nanogenerator-and-its-applica )

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in Figure 24a illustrates the fabrication process of the transient TENG, starting with the deposition of Ag NWs on a glass substrate, followed by the deposition of PPHA solution, and ending with the peel-off of the PPHA film coated with Ag NWs. The as-fabricated PPHA-Ag thin film can work as a single-electrode TENG27, 40, 130 for energy harvesting or sensing upon contact with other materials. To characterize its continuous performance under the 365 nm UV irradiation with an intensity of 4 mW/cm2, the temporal profile of VOC of the PPHA-Ag thin film in contact and separation with a Cu-coated Kapton film was recorded. The voltage drop from 30 V to 0 V in Figure 24b indicates that its function of electricity generation was attenuated rapidly starting from 30 s UV irradiation and fully disappeared after 90 s. This temporal profile matches well with the observation of the PPHA-Ag film during UV-triggered degradation, as shown in Figure 24c. After 30 s irradiation, the surface of the film started to liquify as evidenced by the change of reflectance when compared to the original film. At 90 s, the whole surface had liquified and the film shape was maintained due to the Ag NWs backbone, which justifies the loss of electrical output as in Figure 24b when solid contact is required for energy conversion. Subsequently, the liquid byproducts were absorbed by the drying agents at the bottom and the solid residue of Ag NWs was mixed with the small balls after stir. 66

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