I am fabricating triboelectric nanogenerators, with Nylon and PTFE, however i keep getting a low voltage output. only millivolts. Therew is a gap between the two materials however, i am getting very low output.
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Several reasons for the low output:
1. check your measurement equipment, it is supposed to be a high-resistance meter. Otherwise the TENG possesses a large internal resistance (hundreds of megaohms) will prevent the voltage meter (normal multimeter) to obtain a high output.
2. What configuration of TENG did you fabricate? contact - separation, or sliding? Check the electrodes connection and avoid short-connection.
Hope it helps.
If you use an oscilloscope, then you can use a high voltage probe to measure electrical characterization. Otherwise, you can use electrometer.
If you don't have any specific measurement equipments, you can try to connect resistor of the high resistance value in series with the TENG, in order to measure voltage across resistor.
Satana Pongampaii Please add a resistor of high value in parallel to measure voltage across the resistor. Thank you.
Generally, the high resistance value should be more than 100MOhm, which it can represent on the characteristic of direct voltage on various external load resistances.
However, the internal load resistance of TENG depends on each of materials.
Hi Yusuf
Come to Seville!!!, we have an advanced TENG characterization lab with at least 5 years of experience in working with TENG devices :)
Just to answer you briefly, you are making several mistakes that can be fixed:
1- PTFE and Nylon both have similar electronegativity and therefore not good to use them in contact electrification/TENG experiments. try this combination: PTFE/Metal or Nylon/Metal.
2- Having a well-prepared characterization setup is extremely importnat which I think you do not have yet. You need either a high impedance tool such as a Keithly source meter or an Osciloscope+buffer circuit for measuring the output of your TENG device. Our experience, however, shows that Keithly is not reliable.
3- What do you mean there is a gap between PTFE and Nylon? Are they not touching during the measurements?
4- There are tons of other small tricks I prefer not to mention right here ;)
5- It is very likely that the output you are measuring in the range of millivolts is mostly comprised of the 50 Hz noise coming from the line not the actaul Vout from TENG.
Cheers
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