2025 年 E108.C 巻 6 号 p. 263-266
The I-V measurement results of poly(vinyl alcohol)/ITO triboelectric generators are reported and discussed with a focus on the orientational ordering of molecular dipoles as electrical power sources induced by mechanical rubbing. The results showed that the rubbing induces dc current flowing through the ammeter in the direction from the poly(vinyl alcohol) to the cotton rubbing cloth. The polarity of induced current is opposite to what is expected from triboelectric series table, where poly(vinyl alcohol) is listed in the negative side relative to cotton. Assuming that the OH molecular groups are orientationally ordered in the direction away from the rubbing surface, and the current is induced through depolarization from the ordered state, the current direction is well explained. The results suggest that the molecular orientational ordering induced by rubbing is key for the operation of triboelectric generators using polar materials.
