Su Erming, Wu Fengming, Zhao Siqi, Li Yeti, Deng Chenghao
Center on Nanoenergy Research, School of Physical Science and Technology, Guangxi University, Nanning 530004, P. R. China.
ACS Appl Mater Interfaces. 2022 Apr 6;14(13):15849-15858. doi: 10.1021/acsami.2c01914. Epub 2022 Mar 25.
In recent years, the two-dimensional material MXene has shown great advantages in the field of wearable electronics and pressure sensors. Toward advanced applications, achieving a conformal pressure sensor with ultrathin thickness and great flexibility through a simple preparation principle, while maintaining its high sensitivity and wide detection range, is still a key challenge for the development of high-performance pressure sensors. Herein, we proposed an optimized mild LiF/HCl etching scheme and successfully achieved a high-concentration (>25 mg/mL) preparation of few-layer TiCT MXene. Combining the prepared MXene with an aramid nanofiber (ANF), we designed an ultrathin layered pressure sensor based on an MXene/ANF composite through layer-by-layer suction filtration. The mechanical strength is greatly enhanced by composition with the ANF, while the pure MXene film is fragile. The sensor achieves a high sensitivity of 16.7 kPa, wide detection range (>100 kPa), only 10 μm thickness, great flexibility, and up to 10% stretchability, which are greatly beneficial to practical sensors. We demonstrated the wide application perspective of the sensor in human motion monitoring and human-machine interfaces from low pressure (human pulse) to high pressure (push-up).
近年来，二维材料MXene在可穿戴电子设备和压力传感器领域展现出巨大优势。对于先进应用而言，通过简单的制备原理实现具有超薄厚度和高柔韧性的贴合式压力传感器，同时保持其高灵敏度和宽检测范围，仍然是高性能压力传感器发展面临的关键挑战。在此，我们提出了一种优化的温和LiF/HCl蚀刻方案，并成功实现了高浓度（>25 mg/mL）的少层TiCT MXene制备。将制备的MXene与芳纶纳米纤维（ANF）相结合，我们通过逐层吸滤设计了一种基于MXene/ANF复合材料的超薄分层压力传感器。与纯MXene薄膜易碎相比，与ANF复合后机械强度大大提高。该传感器具有16.7 kPa的高灵敏度、宽检测范围（>100 kPa）、仅10μm的厚度、高柔韧性以及高达10%的拉伸性，这些对实际应用的传感器非常有利。我们展示了该传感器在从低压（人体脉搏）到高压（俯卧撑）的人体运动监测和人机界面中的广泛应用前景。
