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Bio-Design and Manufacturing  2024 Vol.7 No.4 P.463-475

http://doi.org/10.1007/s42242-024-00292-4


Nacre-inspired MXene-based film for highly sensitive piezoresistive sensing over a broad sensing range


Author(s):  Gaofeng Wang, Lingxian Meng, Xinyi Ji, Xuying Liu, Jiajie Liang & Shuiren Liu

Affiliation(s):  School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China; more

Corresponding email(s):   lsrzzdx@zzu.edu.cn

Key Words:  Flexible pressure sensor · MXene · Bioinspired · Physiological signals · Interlayer spacing


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Gaofeng Wang, Lingxian Meng, Xinyi Ji, Xuying Liu, Jiajie Liang & Shuiren Liu. Nacre-inspired MXene-based film for highly sensitive piezoresistive sensing over a broad sensing range[J]. Journal of Zhejiang University Science D, 2024, 7(4): 463-475.

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Abstract: 
As the main component of wearable electronic equipment, flexible pressure sensors have attracted wide attention due to their excellent sensitivity and their promise with respect to applications in health monitoring, electronic skin, and human–computer interactions. However, it remains a significant challenge to achieve epidermal sensing over a wide sensing range, with short response/recovery time and featuring seamless conformability to the skin simultaneously. This is critical since the capture of minute electrophysiological signals is important for health care applications. In this paper, we report the preparation of a nacre-like MXene/sodium carboxymethyl cellulose (CMC) nanocomposite film with a “brick-and-mortar” interior structure using a vacuum-induced self-assembly strategy. The synergistic behavior of the MXene “brick” and flexible CMC “mortar” contributes to attenuating interlamellar self-stacking and creates numerous variable conductive pathways on the sensing film. This resulted in a high sensitivity over a broad pressure range (i.e., 0.03–22.37 kPa: 162.13 kPa−1; 22.37–135.71 kPa: 127.88 kPa−1; 135.71–286.49 kPa: 100.58 kPa−1). This sensor also has a low detection limit (0.85 Pa), short response/recovery time (8.58 ms/34.34 ms), and good stability (2000 cycles). Furthermore, we deployed pressure sensors to distinguish among tiny particles, various physiological signals of the human body, space arrays, robot motion monitoring, and other related applications to demonstrate their feasibility for a variety of health and motion monitoring use cases.

郑州大学刘水任等 | 兼具高灵敏度和宽检测范围的仿贻贝MXene基压力传感器

本研究论文聚焦兼具高灵敏度和宽检测范围的仿贻贝MXene基压力传感器。作为可穿戴电子设备的重要组成部分,柔性压力传感器因其在健康监测、电子皮肤和人机交互等领域中广阔的应用前景而备受关注。然而,在较宽的压力范围内实现传感器的高灵敏性,同时具备快速的响应/恢复时间和与皮肤无缝贴合,仍然是一个重大挑战。在本文中,我们提出使用真空诱导自组装策略制备具有“砖-砂浆”内部结构的珍珠层状MXene/羧甲基纤维素钠(CMC)纳米复合传感膜。柔性CMC“砂浆”的嵌入有效缓解了MXene导电纳米片的层间堆积,赋予其丰富的可变接触通路,提高了纳米复合材料的力学稳定性,从而实现了传感器在宽压力范围内的高灵敏性(0.03–22.37 kPa: 162.13 kPa−1; 22.37–135.71 kPa: 127.88 kPa−1; 135.71–286.49 kPa: 100.58 kPa−1)。此外,该传感器还具有低检测极限(0.85 Pa)、快速响应/恢复时间(8.58 ms/34.34 ms)和良好的循环稳定性。基于上述传感器的优异性能,我们探究了将其用于区分微小物体、人体生理信号识别,空间阵列、机器人运动监测等应用的可行性。

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