An Elastic Autonomous Self-Healing Capacitive Sensor Based on a Dynamic Dual Crosslinked Chemical System

Qiuhong Zhang, Simiao Niu, Li Wang, Jeffrey Lopez, Shucheng Chen, Yifeng Cai, Ruichun Du, Yuxin Liu, Jian Cheng Lai, Ling Liu, Cheng Hui Li, Xuzhou Yan, Chungen Liu, Jeffrey B.H. Tok, Xudong Jia*, Zhenan Bao

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

263 Scopus citations


Adopting self-healing, robust, and stretchable materials is a promising method to enable next-generation wearable electronic devices, touch screens, and soft robotics. Both elasticity and self-healing are important qualities for substrate materials as they comprise the majority of device components. However, most autonomous self-healing materials reported to date have poor elastic properties, i.e., they possess only modest mechanical strength and recoverability. Here, a substrate material designed is reported based on a combination of dynamic metal-coordinated bonds (β-diketone–europium interaction) and hydrogen bonds together in a multiphase separated network. Importantly, this material is able to undergo self-healing and exhibits excellent elasticity. The polymer network forms a microphase-separated structure and exhibits a high stress at break (≈1.8 MPa) and high fracture strain (≈900%). Additionally, it is observed that the substrate can achieve up to 98% self-healing efficiency after 48 h at 25 °C, without the need of any external stimuli. A stretchable and self-healable dielectric layer is fabricated with a dual-dynamic bonding polymer system and self-healable conductive layers are created using polymer as a matrix for a silver composite. These materials are employed to prepare capacitive sensors to demonstrate a stretchable and self-healable touch pad.

Original languageEnglish (US)
Article number1801435
JournalAdvanced Materials
Issue number33
StatePublished - Aug 16 2018


  • capacitive sensors
  • dual interaction
  • elastomers
  • self-healing

ASJC Scopus subject areas

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


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