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26 Results Figure 2.6: Drawing of the working principle of our triboelectric nanogenerator of type Double- single mode. The plastic FEP film (green) makes alternating contacts with the two electrodes (blue), which generates an alternating voltage and current. plastic ribbon between the two copper electrodes generated alternating voltage and current with positive and negative maximum values. The raw signal was then fed into a bridge rectifier (GJB2508 from Diodes Incorporated) and the rectified signal data was recorded, giving frequency and voltage as a function of wind speed on which the plots in Figure 2.7 and Figure 2.8 are based. The wind speed was mea- sured with an air speed meter belonging to the wind tunnel. In this paper, we carry out a detailed study of the frequency and voltage response to wind speed using the three half electrode distances d = 3 mm, 5 mm and 7 mm (electrode distances 6 mm, 10 mm and 14 mm). We find that the frequency increases linearly with air speed, with a cutoff at a low speed for each d. The generated power of our device is enough to power a battery of LED:s. In our device, power started to be generated at wind speeds as low as 1.6 m/s. We also find that the voltage is proportional to the fre- quency at each d. We seem able to explain the main features of the data assuming the presence of von Karman vortices exciting the plastic FEP ribbon into different harmonics of vibration. We anticipate that this design could be useful because it works at low wind speeds, suitable both as air speed meters and power generators.PDF Image | Nanomechanics Quantum Size Effects, Contacts, and Triboelectricity
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