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Wood Derived Composites for High Sensitivity and Wide Linear‐Range Pressure Sensing
Author(s) -
Huang Yan,
Chen Yun,
Fan Xiangyu,
Luo Ningqi,
Zhou Shuang,
Chen ShihChi,
Zhao Ni,
Wong Ching Ping
Publication year - 2018
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201801520
Subject(s) - materials science , microstructure , composite number , composite material , hysteresis , sensitivity (control systems) , silicone , pressure sensor , mechanical engineering , electronic engineering , quantum mechanics , engineering , physics
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, R 2 = 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.