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Download fileMultifunctional Poly(vinyl alcohol) Nanocomposite Organohydrogel for Flexible Strain and Temperature Sensor
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posted on 27.08.2020, 21:30 authored by Jianfeng Gu, Jianren Huang, Guoqi Chen, Linxi Hou, Jin Zhang, Xi Zhang, Xiaoxiang Yang, Lunhui Guan, Xiancai Jiang, Huiyong LiuHydrogels
are important for stretchable and wearable multifunctional
sensors, but their application is limited by their low mechanical
strength and poor long-term stability. Herein, a conductive organohydrogel
with a 3D honeycomb structure was prepared by integrating carbon nanotubes
(CNTs) and carbon black (CB) into a poly(vinyl alcohol)/glycerol (PVA/Gly)
organohydrogel. Such a nanocomposite organohydrogel is built on a
physical cross-linking network formed by the hydrogen bonds among
PVA, glycerol, and water. CNTs and CB had an add-in synergistic impact
on the mechanical and electrical performances of the PVA/Gly organohydrogel
because of the distinct aspect ratios and geometric shapes. The prepared
organohydrogel integrated with a tensile strength of 4.8 MPa, a toughness
of 15.93 MJ m–3, and flexibility with an elongation
at break up to 640%. The organohydrogels also showed good antifreezing
feature, long-term moisture retention, self-healing, and thermoplasticity.
Sensors designed from these organohydrogels displayed high stretching
sensitivity to tensile strain and temperature, with a gauge factor
of 2.1 within a relatively broad strain range (up to ∼600%
strain), a temperature coefficient of resistance of −0.935%·°C–1, and long-term durability. The sensors could detect
full-range human physiological signals and respond to the change in
temperature, which are highly desired for multifunctional wearable
electronic devices.
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Keywords
wearable multifunctional sensorsconductive organohydrogelnanocomposite organohydrogeltemperature coefficientstrain rangeTemperature Sensor Hydrogelsmoisture retentionNanocomposite Organohydrogelcarbon nanotubesMJFlexible Strainmultifunctional wearablePVA4.8 MPaantifreezing featureCBgauge factor3 D honeycomb structurehydrogen bondsCNTaspect ratioscross-linking network