Ultraflexible organic amplifier with biocompatible gel electrodes

Tsuyoshi Sekitani, Tomoyuki Yokota, Kazunori Kuribara, Martin Kaltenbrunner, Takanori Fukushima, Yusuke Inoue, Masaki Sekino, Takashi Isoyama, Yusuke Abe, Hiroshi Onodera, Takao Someya

Research output: Contribution to journalArticlepeer-review

148 Citations (Scopus)


In vivo electronic monitoring systems are promising technology to obtain biosignals with high spatiotemporal resolution and sensitivity. Here we demonstrate the fabrication of a biocompatible highly conductive gel composite comprising multi-walled carbon nanotube-dispersed sheet with an aqueous hydrogel. This gel composite exhibits admittance of 100 mS cm-2 and maintains high admittance even in a low-frequency range. On implantation into a living hypodermal tissue for 4 weeks, it showed a small foreign-body reaction compared with widely used metal electrodes. Capitalizing on the multi-functional gel composite, we fabricated an ultrathin and mechanically flexible organic active matrix amplifier on a 1.2-μm-thick polyethylene-naphthalate film to amplify (amplification factor: ∼200) weak biosignals. The composite was integrated to the amplifier to realize a direct lead epicardial electrocardiography that is easily spread over an uneven heart tissue.

Original languageEnglish
Article number11425
JournalNature communications
Publication statusPublished - 2016 Apr 29

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)


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