Kedambaimoole Vaishakh, Kumar Neelotpala, Shirhatti Vijay, Nuthalapati Suresh, Sen Prosenjit, Nayak Mangalore Manjunatha, Rajanna Konandur, Kumar Saurabh
Department of Instrumentation and Applied Physics, Indian Institute of Science, Bengaluru 560012, India.
Centre for Nano Science and Engineering (CeNSE), Indian Institute of Science, Bengaluru 560012, India.
ACS Sens. 2020 Jul 24;5(7):2086-2095. doi: 10.1021/acssensors.0c00647. Epub 2020 Jul 2.
The discovery of stable two-dimensional (2D) materials has effectuated a rapid evolution of skin conformal sensors for health monitoring via epidermal electronics. Among the newly discovered 2D materials, MXene stands out as a solution-processable 2D material allowing easy fabrication of highly conductive thin films with the potential to realize flexible skin conformal sensors. Here, we present a successful demonstration of a TiC-MXene resistor as an extremely sensitive strain sensor in the form an ultrathin skin mountable temporary tattoo. The skin conformability and form factor afforded by the sensor promises inconspicuous and continuous monitoring of vital health parameters of an individual, like the pulse rate, respiration rate, and surface electromyography. The sensor serves as a single conduit for sensing the respiration rate and pulse, dispensing with the need of mounting multiple sensors. Its remarkably high sensitivity with a gauge factor of ∼7400 has been ascribed to development of nanocracks and their propagation through the film upon application of strain. The fast response and highly repeatable sensor follows easy fabrication steps and can be patterned into any shape and size using a laser.
稳定二维（2D）材料的发现推动了通过表皮电子技术实现用于健康监测的皮肤贴合传感器的快速发展。在新发现的二维材料中，MXene作为一种可溶液加工的二维材料脱颖而出，它能够轻松制造高导电薄膜，具有实现柔性皮肤贴合传感器的潜力。在此，我们成功展示了一种TiC-MXene电阻器，它以超薄可贴在皮肤上的临时纹身形式作为一种极其灵敏的应变传感器。该传感器所具备的皮肤贴合性和外形尺寸有望对个体的重要健康参数，如脉搏率、呼吸率和表面肌电图进行不显眼且连续的监测。该传感器作为感知呼吸率和脉搏的单一通道，无需安装多个传感器。其具有约7400的应变片系数，灵敏度极高，这归因于纳米裂纹的产生及其在施加应变时在薄膜中的扩展。这种响应快速且高度可重复的传感器制造步骤简单，并且可以使用激光加工成任何形状和尺寸。
