Fabrication of Flexible and Transparent Piezoelectric Films and Application to a Film Speaker

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  • MOCHIZUKI Takeo
    Yamanashi Prefectural Industrial Technology Center Graduate Faculty of Interdisciplinary Research, University of Yamanashi
  • OMI Takuya
    Graduate Faculty of Interdisciplinary Research, University of Yamanashi
  • NODA Asuka
    Graduate Faculty of Interdisciplinary Research, University of Yamanashi
  • OKUZAKI Hidenori
    Graduate Faculty of Interdisciplinary Research, University of Yamanashi

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Other Title
  • フレキシブル透明圧電素子の作製とフィルムスピーカーへの応用
  • フレキシブル トウメイ アツデン ソシ ノ サクセイ ト フィルムスピーカー エ ノ オウヨウ

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Abstract

Flexible and transparent piezoelectric films were fabricated by bar-coating of conductive inks consisting of poly(3,4-ethylenedioxythiophene) doped with poly(4-styrenesulfonate) (PEDOT:PSS) water dispersion and ethylene glycol on piezoelectric poly(vinylidene difluoride) (PVDF) films. The water contact angle of the PVDF film decreased from 74° to 34° by plasma ion bombardment at a discharge current of 30 mA for 1 min, which significantly improved adhesion of the PEDOT:PSS on the PVDF film. The electrical and optical properties of the PEDOT:PSS/PVDF films were strongly dependent of the composition of the conductive ink: The sheet resistance (Rs), thickness (d), electrical conductivity (σ), total light transmittance (TT), and haze at 90 wt% of PEDOT:PSS water dispersion were 109 Ω/□, 155 nm, 590 S/cm, 84%, and 3.0%, respectively, where the figure-of merit (FOM) as transparent electrodes was found to be 27. The acoustic transfer properties of the flexible and transparent PEDOT:PSS/PVDF film speakers showed that the maximum sound pressure level (SPL) attained was as high as 70 dB at 90 wt% of the PEDOT:PSS dispersion, while the Rs of the PEDOT:PSS electrodes was crucially important for the performance of the film speaker.

Journal

  • KOBUNSHI RONBUNSHU

    KOBUNSHI RONBUNSHU 74 (4), 298-303, 2017

    The Society of Polymer Science, Japan

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