Electronic skin (E-skin) with tactile sensing characteristics has presented great potential in disease diagnosis and health assessment; however, the imperfect combination of ultra-flexibility and high-sensitivity have restricted its widespread application. Here, we report a contact-separation triboelectric-nanogenerator (CS-TENG) consisting of ultra-flexible micro-frustum-array polydimethylsiloxane (mf-PDMS) film and Cu electrodes as the basic friction units, which can achieve self-powered weak physiological signal monitoring with great comfort. The CS-TENG uses elastic mf-PDMS as both the major body and the friction layer to realize ultra-flexible and conformal contact with irregular human skin. By exploring the microelectromechanical system (MEMS) preparation process, a uniform and controllable mf-arrays structure was fabricated to utilize both the normal and shear stresses, thereby increasing friction and enhancing device sensitivity. The CS-TENG displays high sensitivity (5.67 V/10⁵Pa), good linearity (R²=0.99 of voltage), high stability (more than 80000 cycles), and fast response time (60 ms). With these outstanding characteristics, the CS-TENG can sense subtle changes in wrist pulse under various physiological conditions, which can also be easily arranged into a 1×3 array to mimic the three-fingered pulse-taking in traditional Chinese medicine. This work provides a new way to prepare ultra-flexible and high-sensitive TENG as E-skin and demonstrates its potential application.

具有触觉感应特性的电子皮肤（E-skin）在疾病诊断和健康评估中具有巨大的潜力。然而，超柔韧性和高灵敏度的不完美结合限制了其广泛的应用。在这里，我们报道了一种由超柔性微截锥阵列聚二甲基硅氧烷（mf-PDMS）膜和铜电极作为基本摩擦单元的接触分离式摩擦生电剂（CS-TENG），它可以实现自供电的弱生理信号监控非常舒适。CS-TENG使用弹性mf-PDMS作为主体和摩擦层，以实现与不规则人体皮肤的超柔韧性和适形接触。通过探索微机电系统（MEMS）的制备过程，制造出均匀且可控的mf阵列结构，以利用法向应力和剪切应力，从而增加摩擦力并增强器件灵敏度。CS-TENG显示高灵敏度（5.67 V / 10⁵ Pa），良好的线性度（R ² = 0.99电压），高稳定性（超过80000个循环）和快速响应时间（60毫秒）。凭借这些出色的特性，CS-TENG可以感知各种生理条件下腕部脉动的细微变化，也可以轻松地排列成1×3阵列以模仿中药的三指脉搏采集。这项工作为制备超柔性和高灵敏度的TENG作为电子皮肤提供了一种新方法，并证明了其潜在的应用前景。