Institute of Polymer Science and Engineering, National Taiwan University, Taipei, 10617, Taiwan.
Institute of Physical Chemistry, University of Hamburg, 20146, Hamburg, Germany.
Small Methods. 2023 Sep;7(9):e2300170. doi: 10.1002/smtd.202300170. Epub 2023 May 8.
Wearable flexible strain sensors with spatial resolution enable the acquisition and analysis of complex actions for noninvasive personalized healthcare applications. To provide secure contact with skin and to avoid environmental pollution after usage, sensors with biocompatibility and biodegradability are highly desirable. Herein, wearable flexible strain sensors composed of crosslinked gold nanoparticle (GNP) thin films as the active conductive layer and transparent biodegradable polyurethane (PU) films as the flexible substrate are developed. The patterned GNP films (micrometer- to millimeter-scale square and rectangle geometry, alphabetic characters, and wave and array patterns) are transferred onto the biodegradable PU film via a facile, clean, rapid and high-precision contact printing method, without the need of a sacrificial polymer carrier or organic solvents. The GNP-PU strain sensor with low Young's modulus (≈17.8 MPa) and high stretchability showed good stability and durability (10 000 cycles) as well as degradability (42% weight loss after 17 days at 74 °C in water). The GNP-PU strain sensor arrays with spatiotemporal strain resolution are applied as wearable eco-friendly electronics for monitoring subtle physiological signals (e.g., mapping of arterial lines and sensing pulse waveforms) and large-strain actions (e.g., finger bending).
具有空间分辨率的可穿戴柔性应变传感器能够采集和分析复杂动作，适用于非侵入式个性化医疗保健应用。为了与皮肤安全接触并避免使用后的环境污染，具有生物相容性和可生物降解性的传感器是非常理想的。在此，开发了由交联金纳米粒子（GNP）薄膜作为有源导电层和透明可生物降解聚氨酯（PU）薄膜作为柔性基底组成的可穿戴柔性应变传感器。图案化的 GNP 薄膜（微米到毫米尺度的正方形和长方形几何形状、字母、波和阵列图案）通过简单、清洁、快速和高精度的接触印刷方法转移到可生物降解的 PU 薄膜上，无需牺牲聚合物载体或有机溶剂。具有低杨氏模量（≈17.8 MPa）和高拉伸性的 GNP-PU 应变传感器表现出良好的稳定性和耐用性（10000 次循环）以及可降解性（在 74°C 的水中 17 天后失重 42%）。具有时空应变分辨率的 GNP-PU 应变传感器阵列可用作可穿戴的环保电子产品，用于监测微妙的生理信号（例如，动脉线的映射和脉搏波形的传感）和大应变动作（例如，手指弯曲）。
