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Paper is a material with a high Young’s modulus that vibrates sensitively due to environmental noise, voice, and sound. This study aims to create a triboelectric power generator to convert this sonic vibration energy into electrical energy to power microelectronics embedded on paper. A sonic wave has two wave modes, transverse and longitudinal, that propagate in paper; therefore, two types of triboelectric power generators were designed for trial simulation as the first step. A triboelectrically charged polytetrafluoroethylene sheet and a back electrode were attached to a paperboard. Another paperboard with a counter electrode attached was vibrated in the out-of-plane direction corresponding to transverse waves such that it would repeatedly move toward and away from the other paperboard. The generated power between the two electrodes reached 11.8 µW at 2 MΩ load. When comb-shaped electrodes were applied, manual strokes in the in-plane direction, corresponding to a longitudinal wave, induced voltage up to 8.2 V. The result suggested that sonic waves could be an electric power source for microelectronics in the future.

Triboelectric Power Generation from Paper Vibration Induced by Sonic Waves