塑性金屬應用於具自供電/無線傳輸之穿戴式壓力感測器研製

Triboelectric generators (TEGs) use simple physical contact to convert mechanical energy into electrical output. However, most of the TEGs mainly use metal and ITO films as electrode materials. These materials without high flexibility will limit the application of the TEGs. Therefore, this study uses commercially available conductive fabrics as electrodes, and uses four PDMS surfaces with smooth, rough, porous and graphene oxide (GO) as the friction layers, to achieve simple production, low cost, high flexibility, high stability single-electrode-mode fabric-based triboelectric devices with the size of 70 × 50 mm2.The results show that the fabric-based triboelectric device using PDMS with GO (GO@PDMS) as the friction layer has the best open circuit voltage and short circuit current output after SF6 plasma surface modification treatment, which are 140.37 V and 2.57 μA respectively. In addition, it was also found that when the thickness of the friction layer increases, the surface area during contact will increase to a certain extent. But when it is about 1.6 mm, the contact area that can be increased and close to saturation, so it will only increase the thickness and reduce the output performance as the thickness is over 1.6 mm. We also discussed in terms of devices actuation frequency and applied force. It is found that the higher the actuation frequency, the output current increases significantly, and the gradual increase of the applied force can increase the output performance, but when the force reaches 6 N or more, the output will tend to be stable.Evaluated the effect of load resistance on the output voltage and current, and further learned that when the load resistance is 50 MΩ, the maximum power is 130.5 μW. Durability and washing resistance tests also confirmed that the performance of the device is extremely stable. We integrated the device intoclothes, shoes and trousers to obtain the energy generated during exercise, and the different wave patterns collected can be used to determine the action form, so it can be used for motion sensing. On palm tapping the device, 180 green LEDs connected in series can be lit up, and also use a bridge rectifier circuit in parallel with capacitors, and then charge them. The energy can drive the LEDs through the switch key.The Bluetooth wireless module and two reverse amplifiers are also used to process the voltage signals sensed by the device, which can be wirelessly transmitted to a computer or mobile APP, proving that it can be applied to the sensing field with wireless transmission function in the future.