Advances in high-performance flexible MXene piezoresistive sensors based microstructures biomimetic

In recent years, with the development of flexible electronics, light, thin, flexible, low-cost, wearable, large-scale preparation of the flexible sensor gradually become a major research focus. High sensitivity, fast response, easy integration, low power consumption of the flexible pressure sensor is interactive and wearable electronic key device. Sensors in monitoring human activity, aspects of biomedical research, artificial intelligence, interactive and so has great potential. Real-time monitoring and feedback of human activities, such as blood pressure, pulse, body movement, etc., in biomedical research, disease diagnosis and prompt treatment is essential. However, at low cost, high sensitivity, large-scale preparation of piezoresistive sensors still faces enormous challenges. 2020 February 10, the international authoritative academic journal \”ACS Nano\” published online Wuhan Optical National Research Center, Huazhong University of Science and Technology Lilu Ying Associate Professor and Professor Gao Yi Hua team of the latest research results \”high performance spray Ti3C2Tx biomimetic microstructure (MXene) based piezoresistive sensors\” (Bioinspired Microspines for a high-Performance spray Ti3C2Tx MXene -Based PiezoresistiveSensor). 基于仿生微结构的高性能柔性MXene压阻传感器研究进展 In the latest study, Ti3C2Tx (MXenes) having a two-dimensional structure, high conductivity, controllable synthesis process, etc., it is a promising electrode material pressure sensor, energy storage, electromagnetic shielding, catalytic, field of the photoelectric sensor and has a wide range of uses. By a two-dimensional Ti3C2Tx (MXenes) a specific structure and is excellent in electrical conductivity, and a metal microstructure of randomly distributed (similar to human skin) inspired sensing effects, we use the stencil printing process method can be mass produced, sprayed excellent conductivity MXene material, a flexible manufacturing a highly sensitive piezoresistive sensor. Piezoresistive sensors obtained showed high sensitivity (151.4 kPa -1 ), a relatively short response time (<130 ms),超低的压力检测极限(4.4 Pa)以及出色的循环稳定性(超10,000次)的优异性能。结合力学原位电子显微镜研究技术以及有限元理论模拟,从结构角度和理论力学角度动态揭示了传感器的高灵敏度传感机理。受生物启发的随机微结构可以有效地提高压力传感器的灵敏度和压力检测极限。该传感器在监视人体生理信号,定量检测压力分布以及实时远程监视智能机器人运动方面表现出卓越的性能,可以应用于医疗监测、智能人机交互、可穿戴智能设备等多领域中。

Introduction [Photo]

基于仿生微结构的高性能柔性MXene压阻传感器研究进展
Figure 1. biomimetic microstructure piezoresistive sensorDesign and assembly of the device. Preparation process biomimetic microstructure MXene piezoresistive sensors MXene in (a) and thrusting skin tissue microstructures (b) under the skin preparation (c).
基于仿生微结构的高性能柔性MXene压阻传感器研究进展
FIG. 2. MAX phase, characterization and microscopy MXene nanosheet bionic microstructure of PDMS. AFM images TEM image (d) (a, b) MAX phase MXene SEM image and (c) MXene nanosheets MXene nanosheet thickness of about 1.39 nm HAADF image (e) MXene nanosheet (g) having a micro PDMS roughened surface structure SEM image (i) measuring the thickness of PDMS (J) of PDMS and SEM sides (k) SEM image of the microstructure (l) of each microstructure average roughness of sandpaper types.
基于仿生微结构的高性能柔性MXene压阻传感器研究进展
Figure 3. The electrical characteristics MXene bionic microstructure piezoresistive response of the sensor. (A) test system (b) IV response curve, an ohmic contact (c) IT response curve (D) sensitivity curve (e) the response time and recovery time (f) a pressure cycle test exhibited excellent cycle stability (g) frequency response – excellent frequency stability and uniformity (h) a pressure sensor superior speed performance (i) quick response.
基于仿生微结构的高性能柔性MXene压阻传感器研究进展
Figure 4 discloses a sensing mechanism MXene situ dynamic sensor. Analysis of (a) 3D roughness analysis SEM morphology and in situ when (b-e) dynamic motion sensor.
基于仿生微结构的高性能柔性MXene压阻传感器研究进展
FIG. 5. MXene piezoresistive sensor real-time monitoring and detection of small human activity physical signal. (A) a curved finger (b) bending the wrist (c) elbow pivot (D) of the wrist pulse (e) swallowing the throat (f) a finger tap (g) ankle flexion (h) bent knee (i) barley (4.4 Pa) and rice (8.6 Pa) testing of small objects.
基于仿生微结构的高性能柔性MXene压阻传感器研究进展
FIG 6. (a) MXene piezoresistive sensor 4 × 4 array of pressure distribution detection current signal (b) detecting motion behavior of the robot (c) into a piezoresistive sensor portable mobile device.

This article summarizes []

The piezoresistive sensors having a large-scale preparation easy, low-cost, high-sensitivity, thin shape, is attached to the flexibility of the skin, it is expected to become a candidate for wearable electronics. Performance of the pressure sensor has been greatly improved, high sensitivity (151.4 kPa -1 ), a short response time (<130 ms),压力检测极限小(4.4 Pa),并具有出色的稳定性。传感器可以实际应用于人体活动的实时监控,细微压力的检测及压力分布的定量显示,其在人体活动检测,医疗监控,灵活的佩戴和人机交互有巨大的应用潜力。

该工作得到了国家自然科学基金(51871104,11674113,11874025,11904091),湖北省自然科学基金(2017CFB417, 2019CFB259)、中央高校基本科研业务费专项资金(No.2017KFYXJJ039)等项目资助。 Li Louying Associate Professor, and Professor Yee of papers together Corresponding author, graduate students Cheng Wing as the first author Ma Yanan associate professor , Jumong, Yueyang associate professor , – sided Wanglong Fei, Gu Shuangfeng, Li Chen, Qi Professor Sky, Wang Jianbo, to participate in work-related co-author of the paper links:. https: //pubs.acs.org/doi/10.1021/acsnano.9b08952

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