Intimate encapsulation of non-planar electrodes via a viscoplastic interlayer
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ID: 314237
2026
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Abstract
Abstract Implantable electronics often adopt non-planar electrodes to resolve the conflict between conductivity and deformability. Encapsulation of these electrodes becomes a critical challenge for conventional elastic seals due to the elastic-contact-induced interfacial voids and consequential fluid ingress. Here, we present a viscoplastic interlayer that can adapt to the three-dimensional structures of non-planar electrodes, resulting in intimate contact and hermetic encapsulation. This interlayer is a polymeric composite that consists of a long-chain polyisobutylene as the matrix, a short-chain polyisobutylene as the plasticizer, and maleic anhydride-grafted polypropylene as the foreign domains. Its viscoplasticity originates from the chain slippage and permanent disentanglement of the long-chain polyisobutylene, promoted by the plasticizers and confining domains, respectively. When synergized with covalent bonding, the interlayer derives defect-free interfaces between the sealing elastomer and various non-planar electrodes, such as microwires, micropillars, and serpentine electrodes. This intimate encapsulation stabilizes the signal-to-noise ratio of an electromechanical device for 50 weeks in acidic, neutral, and alkaline solutions and extends the in vivo duration of signal fidelity for stretchable bioelectronics to a record 45 weeks. This viscoplastic interlayer provides fruitful implications for improving the long-term stability of implantable bioelectronics.
| Reference Key |
openalex_W7161837725
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| Authors | Liqian Liu, Xinyue Xiang, Yinglin Zhi, Guoli Chen, Yan Shao, Rui Xia, Daohang Cai, Huiping Wu, Yuda Chen, Jingjia Li, Fuzeng Ren, S Zhang, Chuanfei Guo, Yanhao Yu |
| Journal | national science review |
| Year | 2026 |
| DOI |
10.1093/nsr/nwag297
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| URL | |
| Keywords | Keywords not found |
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