This paper presents a novel stretchable pulse sensor fabricated by a selective liquid-metal plating process (SLMP), which can conveniently attach to the human skin and monitor the patient's heartbeat. The liquid metal-based stretchable pulse sensor consists of polydimethylsiloxane (PDMS) thin films and liquid metal functional circuits with electronic elements that are embedded into the PDMS substrate. In order to verify the utility of the fabrication process, various complex liquid-metal patterns are achieved by using the selective wetting behavior of the reduced liquid metal on the Cu patterns of the PDMS substrate. The smallest liquid-metal pattern is approximately 2 μm in width with a uniform surface. After verification, a transparent flowing LED light with programmed circuits is realized and exhibits stable mechanical and electrical properties under various deformations (bending, twisting and stretching). Finally, based on SLMP, a wireless pulse measurement system is developed which is composed of the liquid metal-based stretchable pulse sensor, a Bluetooth module, an Arduino development board, a laptop computer and a self-programmed visualized software program. The experimental results reveal that the portable non-invasive pulse sensor has the potential to reduce costs, simplify biomedical diagnostic procedures and help patients to improve their life in the future.

中文翻译：

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适用于可拉伸生物传感器应用的先进的选择性液态金属电镀技术

本文介绍了一种通过选择性液态金属电镀工艺（SLMP）制成的新型可伸缩脉冲传感器，该传感器可方便地附着在人体皮肤上并监测患者的心跳。基于液态金属的可伸缩脉冲传感器由聚二甲基硅氧烷（PDMS）薄膜和液态金属功能电路组成，这些电路中的电子元件嵌入到PDMS基板中。为了验证制造过程的实用性，通过使用还原的液态金属在PDMS基板的Cu图案上的选择性润湿行为，获得了各种复杂的液态金属图案。最小的液态金属图案的宽度约为2μm，具有均匀的表面。验证后，实现了具有编程电路的透明流动LED灯，并在各种变形（弯曲，扭曲和拉伸）下表现出稳定的机械和电气性能。最后，基于SLMP，开发了一种无线脉冲测量系统，该系统由基于液态金属的可伸展脉冲传感器，蓝牙模块，Arduino开发板，便携式计算机和自编程的可视化软件程序组成。实验结果表明，便携式无创脉搏传感器具有降低成本，简化生物医学诊断程序并帮助患者改善生活的潜力。开发了一个无线脉冲测量系统，该系统由基于液态金属的可伸展脉冲传感器，蓝牙模块，Arduino开发板，便携式计算机和自编程的可视化软件程序组成。实验结果表明，便携式无创脉搏传感器具有降低成本，简化生物医学诊断程序并帮助患者改善生活的潜力。开发了一个无线脉冲测量系统，该系统由基于液态金属的可伸展脉冲传感器，蓝牙模块，Arduino开发板，便携式计算机和自编程的可视化软件程序组成。实验结果表明，便携式无创脉搏传感器具有降低成本，简化生物医学诊断程序并帮助患者改善生活的潜力。