Recently, I was trying to study PVDF-based piezoelectric sensors and there were some problems during the test. The device structure is PET/Ag NWs / PVDF/Ag NWs /PET, I used resonator to generate a periodic force and it was monitored by a force sensor, the piezoelectric device was attached to the Al substrate. Here are the specific questions:
1. The open circuit voltage signal generated by the device is different in the case of forward and reverse connection. The voltage in the forward connection is much greater than the reverse connection. In the case of a forward connection, I just thought that the rod of the resonator and the upper electrode constitute a triboelectric system to generate triboelectric charge to affect the open circuit voltage. But, I did not find a suitable solution.
2. When I fabricated a PET/Ag NWs / PI/Ag NWs /PET device, a voltage of several hundred millivolts still existed during the test.
I'm very confused and I hope someone can help me solve the probelem, thanks!
When you touch the device, there exised charge transfer between device and you finger or gloves, that is the CS mode triboelectric nanogenerator. So, the output voltage was higher than the true piezoelectric voltage. try to use a conductive shield layer to make sure the charge flow to the gound and then measure the output of piezoelectric sensor. u should know that polymer films interact wth each other can provide tribo charge insider device or touching it
One method from the paper 'A new insight towards eggshell membrane as high energy conversion efficient bio-piezoelectric energy harvester' :
put a PP layer between sample(with electrode) and PDMS layer. If any kind of triboelectric charge is generated on PDMS surface during imparting, it can be easily avoided by using PP tape as the electrodes are not directly connected to the PDMS.
What do you think about this method? And how we demonstrate its effect of avoiding triboelectricity?
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