Plasticizing Silk Protein for On-Skin Stretchable Electrodes

Geng Chen, Naoji Matsuhisa, Zhiyuan Liu, Dianpeng Qi, Pingqiang Cai, Ying Jiang, Changjin Wan, Yajing Cui, Wan Ru Leow, Zhuangjian Liu, Suxuan Gong, Ke Qin Zhang, Yuan Cheng, Xiaodong Chen

Research output: Contribution to journalArticlepeer-review

89 Citations (Scopus)

Abstract

Soft and stretchable electronic devices are important in wearable and implantable applications because of the high skin conformability. Due to the natural biocompatibility and biodegradability, silk protein is one of the ideal platforms for wearable electronic devices. However, the realization of skin-conformable electronic devices based on silk has been limited by the mechanical mismatch with skin, and the difficulty in integrating stretchable electronics. Here, silk protein is used as the substrate for soft and stretchable on-skin electronics. The original high Young's modulus (5–12 GPa) and low stretchability (<20%) are tuned into 0.1–2 MPa and > 400%, respectively. This plasticization is realized by the addition of CaCl2 and ambient hydration, whose mechanism is further investigated by molecular dynamics simulations. Moreover, highly stretchable (>100%) electrodes are obtained by the thin-film metallization and the formation of wrinkled structures after ambient hydration. Finally, the plasticized silk electrodes, with the high electrical performance and skin conformability, achieve on-skin electrophysiological recording comparable to that by commercial gel electrodes. The proposed skin-conformable electronics based on biomaterials will pave the way for the harmonized integration of electronics into human.

Original languageEnglish
Article number1800129
JournalAdvanced Materials
Volume30
Issue number21
DOIs
Publication statusPublished - 2018 May 24
Externally publishedYes

Keywords

  • biomaterials
  • molecular dynamics simulations
  • on-skin electronics
  • silk proteins
  • stretchable electronics

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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