Sharma Sudeep, Chhetry Ashok, Zhang Shipeng, Yoon Hyosang, Park Chani, Kim Hyunsik, Sharifuzzaman Md, Hui Xue, Park Jae Yeong
Department of Electronic Engineering, Kwangwoon University, Seoul, 01897, Republic of Korea.
ACS Nano. 2021 Mar 23;15(3):4380-4393. doi: 10.1021/acsnano.0c07847. Epub 2021 Jan 14.
Recently, flexible capacitive pressure sensors have received significant attention in the field of wearable electronics. The high sensitivity over a wide linear range combined with long-term durability is a critical requirement for the fabrication of reliable pressure sensors for versatile applications. Herein, we propose a special approach to enhance the sensitivity and linearity range of a capacitive pressure sensor by fabricating a hybrid ionic nanofibrous membrane as a sensing layer composed of TiCT MXene and an ionic salt of lithium sulfonamides in a poly(vinyl alcohol) elastomer matrix. The reversible ion pumping triggered by a hydrogen bond in the hybrid sensing layer leads to high sensitivities of 5.5 and 1.5 kPa in the wide linear ranges of 0-30 and 30-250 kPa, respectively, and a fast response time of 70.4 ms. In addition, the fabricated sensor exhibits a minimum detection limit of 2 Pa and high durability over 20 000 continuous cycles even under a high pressure of 45 kPa. These results indicate that the proposed sensor can be potentially used in mobile medical monitoring devices and next-generation artificial e-skin.
最近，柔性电容式压力传感器在可穿戴电子领域受到了广泛关注。在宽线性范围内具有高灵敏度并结合长期耐用性，是制造适用于多种应用的可靠压力传感器的关键要求。在此，我们提出了一种特殊方法，通过在聚乙烯醇弹性体基质中制备由TiCT MXene和磺酰胺锂离子盐组成的混合离子纳米纤维膜作为传感层，来提高电容式压力传感器的灵敏度和线性范围。混合传感层中由氢键触发的可逆离子泵浦分别在0 - 30和30 - 250 kPa的宽线性范围内导致5.5和1.5 kPa的高灵敏度，以及70.4 ms的快速响应时间。此外，所制备的传感器即使在45 kPa的高压下，也具有2 Pa的最低检测限和超过20000次连续循环的高耐久性。这些结果表明，所提出的传感器可潜在地用于移动医疗监测设备和下一代人造电子皮肤。
