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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then submerged into a room-temperature water bath for 15 mins, followed by peeling off the entire film from each glass substrate. 2.4.5.6 Mechanical Testing of PPHA and PPHA-Ag Films Mechanical properties of PPHA and PPHA-Ag films were characterized using TA Instrument Q800 Dynamic Mechanical Analyzer. Samples had dimension of 11 mm ×7 mm ×0.1 mm (length ×width ×thickness). Stress-strain curves of samples were measured at 23 °C with a preload force of 0.015 N and were elongated with a constant force ramp rate of 1 N/min until sample-failure occurred, as shown in Figure S1. Young’s modulus [MPa], strain to break value [%], and yield stress [MPa] were obtained from the stress- strain curve. The ability of a material to absorb energy without fracturing is represented by modulus of resilience [J/m3], which was calculated as Modulus of Resilience = Yield Stress2 2(Young's Modulus) 2.4.5.7 Thermal Stability Measurement of PPHA-Ag Film (19) Thermogravimatric analysis (TGA) was performed using a TA Instrument Q50 under inert nitrogen condition with a constant flow rate of 40 ml/min. Weight of 6.112 mg PPHA-Ag film was loaded into the TGA furnace and investigated for its thermal stability. Furnace temperature was ramped at 5 °C/min to 250 °C. Figure S2 shows the weight fraction change of the loaded film with the ramping of temperature. The onset decomposition of the film happened at 113 °C. About 50% residual weight was leftover, due to the residual Ag NWs and non-volatile BMP TFSI. 73

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