Chhetry Ashok, Sharifuzzaman Md, Yoon Hyosang, Sharma Sudeep, Xuan Xing, Park Jae Yeong
Department of Electronic Engineering , Kwangwoon University , 447-1 Wolgye-dong , Nowon-gu, Seoul 01897 , Republic of Korea.
ACS Appl Mater Interfaces. 2019 Jun 26;11(25):22531-22542. doi: 10.1021/acsami.9b04915. Epub 2019 Jun 13.
Advancement of sensing systems, soft robotics, and point-of-care testing requires the development of highly efficient, scalable, and cost-effective physical sensors with competitive and attractive features such as high sensitivity, reliability, and preferably reversible sensing behaviors. This study reports a highly sensitive and reliable piezoresistive strain sensor fabricated by one-step carbonization of the MoS-coated polyimide film to obtain MoS-decorated laser-induced graphene. The resulting three-dimensional porous graphene nanoflakes decorated with MoS exhibit stable electrical properties yielding a reliable output for longer strain/release cycles. The sensor demonstrates high sensitivity (i.e., gauge factor, GF ≈1242), is hysteresis-free (∼2.75%), and has a wide working range (up to 37.5%), ultralow detection limit (0.025%), fast relaxation time (∼0.17 s), and a highly stable and reproducible response over multiple test cycles (>12 000) with excellent switching response. Owing to the outstanding performances of the sensor, it is possible to successfully detect various subtle movements ranging from phonation, eye-blinking, and wrist pulse to large human-motion-induced deformations.
传感系统、软体机器人技术和即时检测的发展需要开发高效、可扩展且具有成本效益的物理传感器，这些传感器应具备高灵敏度、可靠性等具有竞争力和吸引力的特性，并且最好具有可逆的传感行为。本研究报告了一种高灵敏度且可靠的压阻式应变传感器，该传感器通过对涂覆有MoS的聚酰亚胺薄膜进行一步碳化以获得MoS修饰的激光诱导石墨烯来制备。所得的用MoS修饰的三维多孔石墨烯纳米片具有稳定的电学性质，在更长的应变/释放循环中能产生可靠的输出。该传感器具有高灵敏度（即应变片系数，GF≈1242）、无滞后现象（约2.75%）、工作范围宽（高达37.5%）、超低检测限（0.025%）、快速弛豫时间（约0.17 s），并且在多个测试循环（>12 000次）中具有高度稳定且可重复的响应以及出色的开关响应。由于该传感器的出色性能，能够成功检测从发声、眨眼、手腕脉搏到人体大动作引起的各种细微运动。
