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4.2.4 Experimental Methods 4.2.4.1 Fabrication of Triboelectric Keystroke Device Pre-cured silicone rubber (Ecoflex 00-50, Smooth-On) was prepared by mixing the two components in a 1:1 volume ratio., and acrylic molds for top and bottom silicone shells are fabricated using a laser cutter (PLS6.75, Universal Laser Systems). The prepared silicone rubber was casted into the acrylic molds and cured at 50 °C for 6 hours. The top and bottom silicone shells of the triboelectric keystroke device were then peeled off from the molds. Thin films of PET were coated with ITO using magnetron sputtering (PVD75, Kurt J) and laser-cut into the size of a single key. Two-sided coated PET films were placed onto the top silicone shell and covered with another layer of silicone, i.e. the top inner cover; One-sided coated PET films were pasted onto the bottom silicone shell with the ITO layer facing up. Finally, the top and bottom parts of the triboelectric keystroke device were assembled together using the pre-cured silicone rubber as the glue. A superhydrophobic coating (Rust-Oleum® NeverWet®) was facilely sprayed onto the device to achieve a water and dust resistant surface and the contact angle was measured using a ramé-hart Model 250 Standard Goniometer. 4.2.4.2 Electrical Output Measurements The open-circuit voltage and short-circuit current from the triboelectric key were measured by a Keithley 6514 system electrometer. Reduced voltage outputs after the capacitor/resistor-based voltage division were measured by an ADC (NI 9220, 16-Channel Voltage Measurement Module, ±10 V, National Instrument), which was also used for the multichannel measurement. For the voltage-force and durability testing the typing motion 120PDF Image | HIGH PERFORMANCE TRIBOELECTRIC NANOGENERATOR AND ITS APPLICATIONS
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