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 Ti₃C₂–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.

中文翻译：

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用于皮肤适形纹身传感器的独立Ti3C2-MXene膜的激光诱导直接图案化。

稳定的二维（2D）材料的发现实现了用于通过表皮电子设备进行健康监测的皮肤保形传感器的快速发展。在新发现的2D材料中，MXene是可溶液处理的2D材料，能够轻松制造高导电性薄膜，并有可能实现柔性的皮肤保形传感器。在这里，我们成功演示了Ti ₃ C ₂–MXene电阻，作为极灵敏的应变传感器，形式为超薄可皮肤安装的临时纹身。传感器提供的皮肤顺应性和形状因子保证对个体的重要健康参数（如脉搏频率，呼吸频率和表面肌电图）进行不显眼且连续的监控。该传感器用作检测呼吸频率和脉搏的单个导管，无需安装多个传感器。它具有约7400的规格系数，具有极高的灵敏度，这归因于纳米裂纹的发展以及在施加应变后纳米裂纹在薄膜中的传播。快速响应和高度可重复的传感器遵循简单的制造步骤，可以使用激光将其图案化为任何形状和尺寸。