Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 30, Issue 31, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201910020
Keywords
CCTO@PU hybrid sponge; dielectric permittivity; pressure sensors; surface modification
Categories
Funding
- Ministry of Trade, Industry & Energy (MI, Korea) [20000773]
- Bio & Medical Technology Development Program of the NRF - Korean government (MSIT) [NRF-2017M3A9F1031270]
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Pressure sensors with highly sensitive and flexible characteristics have extensive applications in wearable electronics, soft robotics, human-machine interface, and more. Herein, an effective strategy is explored to enhance the sensitivity of the capacitive pressure sensor by fabricating a dielectric hybrid sponge consisting of calcium copper titanate (CaCu3Ti4O12, CCTO), a giant dielectric permittivity material, in polyurethane (PU). An ultrasoft CCTO@PU hybrid sponge is fabricated via dip-coating the PU sponge into surface-modified CCTO nanoparticles using 3-aminopropyl triethoxysilane. The overall results show that the -NH2 functionalized CCTO attributes proper adhesion of CCTO with the -OCN group of the PU to enhance interfacial polarization leading to a high dielectric permittivity (167.05) and low loss tangent (0.71) beneficial for flexible pressure sensing applications. Moreover, the as-prepared CCTO@PU hybrid sponge at 30 wt% CCTO concentration exhibits excellent electromechanical properties with an ultralow compression modulus of 27.83 kPa and a high sensitivity of 0.73 kPa(-1) in a low-pressure regime (<1.6 kPa). Finally, pressure and strain sensing performance is demonstrated for the detection of human activities by mounting the sensor on various parts of the human body. The work reveals a new opportunity for the facile fabrication of high performance CCTO-based capacitive sensors with multifunctional properties.
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