Electroconductive polymer-coated silk fiber electrodes for neural recording and stimulation in vivo

Satoshi Watanabe, Hideyuki Takahashi, Keiichi Torimitsu

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


We fabricated a silk-based low-impedance flexible electrode by coating a silk thread with the electroconductive polymer poly(3,4-ethylenedioxythiophene) doped with p-Toluenesulfonate (PEDOT:pTS). This electrode had a lower impedance (about 1.8 kΩ/cm) than the silk electrode coated with PEDOT doped with poly(styrene sulfonate) (PEDOT:PSS) (about 1.3MΩ/cm) reported previously. Using this electrode, a novel gamma-band oscillatory activity was recorded in the electrocorticogram from the embryonic chick brain with a high signal-To-noise ratio. Electrical stimulation was also possible with the silk electrode. We also fabricated an all-silk electrode array and recorded synchronized gamma oscillations. These results demonstrate that the silk electrode can be used for electrophysiological recording and local stimulation in vivo. The silk electrode has the potential to be used for diagnostic and therapeutic purposes and as a brain-machine interface.

Original languageEnglish
Article number037001
JournalJapanese journal of applied physics
Issue number3
Publication statusPublished - 2017 Mar

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)


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