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Figure 25. Characterization of PPHA-Ag film. (a) Tensile stress-strain response. (b) TGA result. 2.4.4 Demonstrations using PPHA-Based Transient TENG To demonstrate the electricity generation capability of our transient TENG, it was operated in the single-electrode mode by hand tapping and used to power six LEDs connected in series. The LEDs were lit up successfully initially, but after 365 nm UV radiation for 2 minutes, the transient TENG lost the power function due to the liquefaction, as evidenced by the liquid droplets on the PTFE film in Figure 26a. Besides energy harvesting, the transient single-electrode TENG can be used for touch sensing as well. As in Figure 26b, a transient TENG was used as a touch sensor to trigger an alarm bell through a customized control circuit. The bell could be activated by the transient TENG sensor before UV radiation but not after. In Figure 26c, a transient triboelectric acoustic sensor was fabricated by coupling the PPHA-Ag film with a paper sheet covered by Cu and Kapton. It was demonstrated as a microphone to record music played by a speaker, with the output electric signals plotted in Figure 26c. As expected, UV exposure of the device liquified the film and disabled the sound recording function. These demonstrations show that the transient TENG can be “deactivated” via UV/sunlight radiation after their designed 68PDF Image | HIGH PERFORMANCE TRIBOELECTRIC NANOGENERATOR AND ITS APPLICATIONS
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