Wu Congyi, Tang Xing, Gan Lin, Li Wenfei, Zhang Jian, Wang Hao, Qin Ziyu, Zhang Tian, Zhou Tingting, Huang Jin, Xie Changsheng, Zeng Dawen
State Key Laboratory of Materials Processing and Die Mould Technology , Huazhong University of Science and Technology (HUST) , Wuhan 430074 , China.
Chongqing Key Laboratory of Soft-Matter Material Chemistry and Function Manufacturing, School of Chemistry and Chemical Engineering , Southwest University , Chongqing 400715 , China.
ACS Appl Mater Interfaces. 2019 Jun 5;11(22):20535-20544. doi: 10.1021/acsami.9b05135. Epub 2019 May 24.
For the stretchable electrode, strong interface adhesion is the primary guarantee for long service life, and the maximization of the tensile limit with remarkable electrical stability can expand the scope of its use. Here, a cost-effective strategy is proposed to fabricate a high-adhesion stretchable electrode. By modifying dopamine and functionalized silane on a polydimethylsiloxane (PDMS) substrate in sequence before the electroless deposition process, super-high adhesion up to 3.1 MPa is achieved between the PDMS substrate and silver layer, and the electrode exhibits extraordinary conductivity of 4.0 × 10 S/m. This process is also suitable for other common flexible substrates and metals. Moreover, inspired by the micro-/nanostructure on the surface of lotus leaf, a biomimetic elastomeric micropore film with a uniformly distributed micropore is fabricated by the one-step soft lithography replication process. The electrode exhibits a large tensile limit exceeding 70% uniaxial tensile and superior electrical stability from 6.3 to 11.5 Ω under 20% uniaxial tensile for more than 10 000 cycles. This study seeks a promising method to manufacture stretchable electrodes with high adhesion, large tensile limit, and excellent electrical stability, showing great potential to detect various biological signals including joint movement, surface electromyography, and so forth.
对于可拉伸电极而言，强大的界面附着力是其长使用寿命的首要保证，而拉伸极限的最大化以及卓越的电稳定性能够扩大其使用范围。在此，我们提出一种经济高效的策略来制备高附着力的可拉伸电极。通过在化学镀工艺之前依次在聚二甲基硅氧烷（PDMS）基底上修饰多巴胺和功能化硅烷，在PDMS基底和银层之间实现了高达3.1 MPa的超高附着力，并且该电极展现出4.0×10 S/m的非凡电导率。此工艺也适用于其他常见的柔性基底和金属。此外，受荷叶表面微/纳米结构的启发，通过一步软光刻复制工艺制备了一种具有均匀分布微孔的仿生弹性体微孔膜。该电极在单轴拉伸超过70%时表现出较大的拉伸极限，并且在20%单轴拉伸下超过10000次循环时具有6.3至11.5 Ω的优异电稳定性。本研究探寻了一种制造具有高附着力、大拉伸极限和优异电稳定性的可拉伸电极的有前景的方法，显示出在检测包括关节运动、表面肌电图等各种生物信号方面的巨大潜力。
