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Integrated Flexible Pressure Sensor Based on Bioinspired Lotus-Leaf Microstructures
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DOI：10.1021/acsaelm.6c00574.png)
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Abstract
En 中文
Flexible pressure sensors hold significant application value in fields such as healthcare monitoring and human−machine interaction. However, conventional flexible piezoresistive pressure sensors fundamentally face two critical challenges: (i) the inherent trade-off between high sensitivity and a wide detection range and (ii) structural instability caused by matrix collapse under sequence compression. To address these limitations, we develop an integrated hybrid piezoresistive pressure sensor using Ti3C2Tx MXene and multiwalled carbon nanotubes (MWCNTs) as active materials. Inspired by the bioinspired lotus leaf structure, the sensor combines a microdome structure with a modified porous architecture, forming an integrated hierarchical microstructure. A synergistic, multiple response is activated under applied pressure: the microdome/electrode contact area expands, quantum tunneling through the compressed network is dramatically enhanced, and the MXene/MWCNT conductive framework undergoes coordinated collapse, collectively amplifying the overall electrical response. As a result, this integrated sensor achieves a high sensitivity (−7.94 kPa−1), a wide detection effective range (0−200 kPa), and a rapid response time (56 ms). Furthermore, the integrated bioinspired structure design ensures superior signal stability with a long duration (6000 cycles under 6 kPa pressure), enabling outstanding overall performance. The advanced pressure sensor, with multifunctional capabilities spanning human motion detection, posture correction, cycling analytics, and data transmission, represents a compelling enabler for next-generation wearables and offers strong commercial potential.
Keywords:
Layers
Microstructures
Sensors
Thermodynamic properties
Two dimensional materials
flexible pressure sensors
Ti3C2Tx
bioinspired
hierarchical microstructure
integrated
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