Department of Materials Science and Engineering, University of California Irvine, Irvine, CA, 92697, USA.
Department of Biomedical Engineering, University of California Irvine, Irvine, CA, 92697, USA.
Adv Healthc Mater. 2019 Jul;8(13):e1900109. doi: 10.1002/adhm.201900109. Epub 2019 Apr 29.
Wrinkled gold thin films on elastomeric substrates are used as robust parallel plate electrodes for soft capacitive pressure sensors. The wrinkled structures create a robust integration with the polymer, allowing repeated normal force to deform the thin film without failure. By incorporating microridged structures that support the counter electrodes to create air cavities within the elastomeric dielectric layer, pressure sensitivity is further increased to 0.148 kPa over a wide dynamic range of up to 10 kPa. The wide dynamic range and pressure sensitivity of the pressure sensor allow for consistent measurements of the pressure exerted by the radial artery located on the wrist. The soft capacitive pressure sensor displays comparable results when tested against an FDA approved device (Clearsight, Edwards Lifesciences, Irvine, CA) measuring beat-to-beat blood pressure. These soft pressure sensors using wrinkled thin films, therefore, illustrate considerable potential to continuously monitor beat-to-beat blood pressure.
弹性基底上的褶皱金薄膜可用作稳健的平行板电极，用于制造软性电容式压力传感器。褶皱结构与聚合物实现了稳健的集成，使薄膜能够在不受损坏的情况下重复承受法向力变形。通过结合微脊结构来支撑对电极，在弹性介电层内形成气腔，进一步提高了压力灵敏度，在高达 10 kPa 的宽动态范围内可达到 0.148 kPa。压力传感器具有较宽的动态范围和压力灵敏度，可稳定测量位于手腕处的桡动脉所受压力。软性电容式压力传感器在与经 FDA 批准的测量连续血压的设备（Clear sight，Edwards Lifesciences，Irvine，CA）进行对比测试时，显示出相当的结果。因此，使用褶皱薄膜的这些软性压力传感器具有持续监测连续血压的巨大潜力。
