Micro-Nano Innovations (MiNI) Laboratory, Department of Biomedical Engineering, University of California, Davis, CA, 95616, USA.
Fiber and Polymer Science, University of California, Davis, CA, 95616, USA.
Adv Mater. 2017 Sep;29(36). doi: 10.1002/adma.201700253. Epub 2017 Jul 31.
The study of wearable devices has become a popular research topic recently, where high-sensitivity, noise proof sensing mechanisms with long-term wearability play critical roles in a real-world implementation, while the existing mechanical sensing technologies (i.e., resistive, capacitive, or piezoelectric) have yet offered a satisfactory solution to address them all. Here, we successfully introduced a flexible supercapacitive sensing modality to all-fabric materials for wearable pressure and force sensing using an elastic ionic-electronic interface. Notably, an electrospun ionic fabric utilizing nanofibrous structures offers an extraordinarily high pressure-to-capacitance sensitivity (114 nF kPa ), which is at least 1000 times higher than any existing capacitive sensors and one order of magnitude higher than the previously reported ionic devices, with a pressure resolution of 2.4 Pa, achieving high levels of noise immunity and signal stability for wearable applications. In addition, its fabrication process is fully compatible with existing industrial manufacturing and can lead to cost-effective production for its utility in emerging wearable uses in a foreseeable future.
可穿戴设备的研究已成为当前热门的研究课题，其中高灵敏度、抗噪传感机制以及长期佩戴性对于实际应用至关重要。然而，现有的机械传感技术（如电阻式、电容式或压电式）尚未能完全满足这些要求。在这里，我们成功地将一种灵活的超级电容传感模式引入到全织物材料中，用于使用弹性离子-电子界面的可穿戴压力和力传感。值得注意的是，利用纳米纤维结构的静电纺丝离子织物具有极高的压力-电容灵敏度（114 nF kPa ），比任何现有的电容传感器至少高出 1000 倍，比以前报道的离子器件高出一个数量级，其压力分辨率为 2.4 Pa，实现了对可穿戴应用的高噪声免疫力和信号稳定性。此外，其制造工艺完全兼容现有的工业制造，可以实现成本效益高的生产，有望在可预见的未来在新兴的可穿戴应用中得到应用。
