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Hydrophobic and Stable MXene–Polymer Pressure Sensors for Wearable Electronics
journal contribution
posted on 2020-03-20, 12:36 authored by La Li, Xiyao Fu, Shuai Chen, Simge Uzun, Ariana S. Levitt, Christopher E. Shuck, Wei Han, Yury GogotsiTi3C2Tx MXene has exhibited
great potential for use in wearable devices, especially as pressure
sensors, due to its lamellar structure, which changes its resistance
as a function of interlayer distance. Despite the good performance
of the reported pure MXene pressure sensors, their practical applications
are limited by moderate flexibility, excessively high MXene conductivity,
and environmental effects. To address the above challenges, we incorporated
multilayer MXene particles into hydrophobic poly(vinylidene fluoride)
trifluoroethylene (P(VDF-TrFE)) and prepared freestanding, flexible,
and stable films via spin-coating. These films were assembled into
highly sensitive piezoresistive pressure sensors, which show a fast
response time of 16 ms in addition to excellent long-term stability
with no obvious responsivity attenuation when the sensor is exposed
to air, even after 20 weeks. Moreover, the fabricated sensors could
monitor human physiological signals such as knee bending and cheek
bulging and could be used for speech recognition. The mapping spatial
pressure distribution function was also demonstrated by the designed
10 × 10 integrated pressure sensor array platform.
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MXene conductivity20 weeksMXene pressure sensorspressure sensor array platformwearable devicespressure sensorspiezoresistive pressure sensorspressure distribution functionresponse timelamellar structureresponsivity attenuationWearable Electronics Ti 3 C 2 T x MXeneMXene particles16 msspeech recognitioninterlayer distance
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