Wood Derived Composites for High Sensitivity and Wide Linear‐Range Pressure Sensing |
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| Authors: | Yan Huang Yun Chen Xiangyu Fan Ningqi Luo Shuang Zhou Shih‐Chi Chen Ni Zhao Ching Ping Wong |
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| Affiliation: | 1. Department of Electronic Engineering, The Chinese University of Hong Kong, Hong Kong SAR, China;2. School of Electromechanical Engineering and Key Laboratory of Mechanical Equipment Manufacturing & Control Technology, Guangdong University of Technology, Guangzhou, China;3. Department of Mechanical and Automation Engineering, The Chinese University of Hong Kong, Hong Kong SAR, China |
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| Abstract: | Natural wood possesses a unique 3D microstructure containing hierarchical interconnected channels along its growth direction. This study reports a facile processing strategy to utilize such structure to fabricate carbon/silicone composite based flexible pressure sensors. The unique contribution of the multichannel structure on the sensor performance is analyzed by comparing the pressure response of the vertically cut and horizontally cut composite structures. The results show that the horizontally cut composite based sensors exhibit much higher sensitivity (10.74 kPa?1) and wider linear region (100 kPa, R2 = 99%), due to their rough surface and largely deformable microstructure. Besides, the sensors also show little hysteresis and good cycle stability. The overall outstanding sensing properties of the sensors allow for accurate continuous measurement of human pulse and respiration, benefiting the real‐time health signal monitoring and disease diagnoses. |
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| Keywords: | carbon composites piezoresistive pressure sensors wood |
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